# Polyester Yarn for T-Shirt Manufacturing **Fiber Guide · B2B Sourcing · Data-Driven** --- ## Polyester Yarn for T-Shirt Manufacturing. Polyester's position in T-shirt manufacturing has shifted decisively over the past decade — from a budget substitute for cotton to the primary fiber of choice in performance, sublimation-printed, and high-volume branded apparel. A PET-based fiber with moisture-wicking capability up to 3× faster than cotton, colorfastness ratings of 5/5 on standard wash tests, and yarn costs 30–50% below ring-spun combed cotton at comparable counts, polyester is not a compromise — it is the correct engineering choice for specific T-shirt applications. The critical sourcing decision is not whether to use polyester, but which polyester: staple or filament, virgin or recycled (rPET), and what yarn construction and finish specification will deliver the performance your end-use demands. A 150 GSM polyester birdeye for a sports brand is an entirely different product from a 180 GSM polyester-cotton piqué for a corporate workwear buyer. --- ## At a Glance *The comparison, summarised.* | Dimension | Rating | Why | |-----------|--------|-----| | **Softness / Hand Feel** | 6/10 | Fine-denier microfiber polyester (0.5–1.5 dpf) achieves genuine softness comparable to mid-tier cotton. Standard 3–6 dpf polyester jersey is noticeably harsher. Hand feel is entirely driven by denier specification — get this wrong and you lose the application. | | **Durability / Abrasion Resistance** | 9/10 | PET fiber's tensile strength (35–60 cN/tex) significantly exceeds cotton (20–30 cN/tex). T-shirts made from polyester maintain structural integrity through 100+ washes with minimal dimensional change. Pilling is the primary wear indicator, manageable with compact or textured yarn. | | **Colour Retention / Colorfastness** | 9/10 | Disperse dyes on polyester achieve wash fastness of 5/5 and light fastness of 6–7 on the Blue Wool scale — among the highest of any fiber. Sublimation printing goes directly into the fiber structure, delivering photographic-quality prints that do not crack or fade. | | **Breathability / Moisture Management** | 8/10 | Polyester does not absorb moisture (0.4% regain), but engineered moisture-wicking constructions (birdeye, mesh, channel-knit) move sweat away from skin faster than any natural fiber. Performance is a function of fabric construction, not just fiber. Basic jersey polyester without wicking construction is breathability grade 5/10. | | **Stretch & Recovery** | 7/10 | Polyester has 20–30% elongation with good recovery in filament form. Staple polyester fabric recovers to ~85% original dimensions after moderate stretch. For full athletic stretch, still requires elastane blending, but polyester recovers significantly better than cotton at baseline. | | **Cost Efficiency** | 9/10 | At ₹100–₹160/kg for standard polyester DTY yarn, polyester delivers the lowest cost-per-garment of any performance fiber. Combined with superior wash durability, cost-per-wear across 100+ cycles is competitive with all alternatives including cotton. | | **Sustainability / Eco Credentials** | 5/10 | Virgin polyester is petroleum-derived with a carbon footprint of 5.5–9.5 kg CO₂e/kg. rPET from post-consumer bottles reduces carbon by 30–50% and represents a credible, certifiable sustainability claim. Microplastic shedding (0.1–0.3% per wash) is an unresolved environmental concern. | | **Ease of Care / Wash Durability** | 9/10 | Machine washable at 40–60°C, quick-drying (30–60 min air dry versus 2–4 hours for cotton), no ironing required for most constructions. Resists shrinkage — typical post-wash dimensional change under 1.5%. | --- ## Why Polyester for T-Shirt Manufacturing *What makes polyester the right choice for T-shirt manufacturing.* **01. Moisture-Wicking Performance: Engineered Capillary Action** Polyester's hydrophobic surface (0.4% moisture regain) is counterintuitive as a performance advantage, but it is the foundation of functional wicking. Because polyester fiber does not absorb moisture, sweat remains on the fiber surface and is moved through capillary action along the fabric's physical structure — channel knit, birdeye, or mesh constructions create directional flow pathways that pull moisture from skin to the outer face of the fabric where it evaporates. This is why a 150 GSM polyester birdeye dries in under 30 minutes while a 150 GSM cotton jersey takes 2–3 hours. For active T-shirts, sports branded tees, and workwear in warm climates, this is a functional specification, not a marketing claim. Key parameter to specify: the wicking construction must be specified at the knitting stage — plain jersey polyester does not wick appreciably better than cotton and sacrifices cotton's absorption advantage without substituting a genuine wicking benefit. **02. Sublimation Printing Compatibility: Full-Colour Without Limits** Polyester is the only mainstream T-shirt fiber fully compatible with dye-sublimation printing — a process where inks are heat-transferred directly into the polymer structure at 180–200°C, becoming part of the fiber rather than a surface coating. The result: photographic-quality prints with colorfastness of 5/5 (ISO 105-C06), no cracking, no peeling, and no hand feel change after printing. For brands requiring all-over prints, gradient graphics, team uniforms, or photographic-quality artwork, sublimation is the correct process — and it is exclusively a polyester-compatible technology at standard commercial viability. Cotton and cotton-blend T-shirts require screen printing or DTG (Direct-to-Garment) printing, both of which have lower colorfastness, higher per-unit cost at medium volumes, and inferior reproduction quality for complex graphics. Cotton must have a minimum 65% polyester blend for sublimation to produce acceptable output — at lower polyester content, dye take-up is uneven and colors appear washed out. **03. Cost Advantages in High-Volume Manufacturing** Polyester's manufacturing economics are structurally advantageous versus cotton for high-volume T-shirt programs. Yarn cost alone (₹100–₹160/kg for DTY 150D) is 30–50% below ring-spun combed cotton 30s (₹180–₹230/kg) on a comparable weight basis. Beyond yarn cost: polyester fabric requires no pre-shrinking (compacting/sanforising), reducing finishing costs by ₹8–₹15/metre. Dyeing with disperse dye runs at higher temperatures (130°C) but achieves full exhaustion in shorter cycle times than reactive dyeing on cotton, reducing energy cost and water usage per kg of fabric. Polyester fabric also cuts with less fraying at edges, reducing CMT waste and thread consumption. At a volume of 50,000 units per month, these cumulative cost advantages across the supply chain typically amount to 15–25% total cost reduction versus equivalent cotton T-shirts. For brand owners running high-volume corporate gifting, events merchandise, or franchise uniforms, this is the dominant procurement consideration. **04. Recycled Polyester (rPET) and the Sustainability Repositioning** Virgin polyester's petroleum origin was a serious reputational liability for sustainable brands. rPET — polyester yarn produced from post-consumer PET bottles — changes this calculus meaningfully: carbon footprint reduction of 30–50% versus virgin PET (approximately 3–4 kg CO₂e/kg for rPET versus 5.5–9.5 kg for virgin), with GRS (Global Recycled Standard) certification providing chain-of-custody verification that retail buyers increasingly require. The sourcing reality: rPET yarn is available in 75D and 150D DTY from Taiwan, South Korea, and India at a 10–20% premium over virgin polyester — not the cost penalty it was five years ago. For brands targeting EU markets, outdoor/active categories, or institutional buyers with CSR procurement requirements, rPET T-shirts are now the baseline expectation, not a premium feature. One genuine limitation: rPET currently does not achieve the same yarn uniformity as virgin polyester at fine deniers below 50D — relevant for microfiber applications but not for standard T-shirt constructions. --- ## Technical Specifications *Manufacturing specs for Polyester T-Shirt Manufacturing.* **GSM Range** - Lightweight performance tees (sports, activewear): 120–150 GSM - Standard branded T-shirts / corporate: 150–180 GSM - Premium structured tees / retail basics: 180–220 GSM - Heavy-duty workwear T-shirts: 200–240 GSM - *Note: Polyester feels lighter-per-GSM than cotton due to lower fiber density (1.38 g/cm³ vs cotton's 1.54 g/cm³) — a 160 GSM polyester tee feels similar in hand weight to a 175 GSM cotton tee.* **Yarn Count / Denier** - Performance tees: 75D/72F DTY (polyester textured yarn, filament) - Standard T-shirts: 150D/48F or 150D/96F DTY - Microfiber softness: 75D/144F or finer (sub-1 dpf for premium) - Staple polyester blends: 30s–40s Ne (blended with cotton or viscose) - Recycled (rPET): Available in 75D, 150D DTY; 30s–40s staple **Knit Construction** - Plain jersey: Standard for solid-colour T-shirts; smooth face, moderate breathability - Birdeye / mesh: Open structure for enhanced wicking; preferred for sports and activewear T-shirts - Piqué: Corporate polo and sport T-shirts; textured face, better abrasion resistance - Interlock: Premium structured tees; both-face smoothness, heavier weight, more stable - French terry (poly): Occasional use in athleisure T-shirts; heavier, looped back **Shrinkage (first wash, 40°C)** - Polyester jersey: 0.5–1.5% length, 0.5–1.0% width (industry-leading stability) - Polyester-cotton blend (65/35): 2–4% length (cotton component drives shrinkage) - Compacting: Rarely required for 100% polyester; recommended for blends **Pilling Resistance** - Filament polyester (DTY): Grade 4–5 (Martindale 5,000 cycles) — excellent - Staple polyester (spun): Grade 2–3 (Martindale 2,000 cycles) - Anti-pilling finish (chemical): Raises staple polyester to Grade 3–4 **Colorfastness** - Disperse dye (polyester filament): Wash 5/5 / Light 6–7 / Rubbing (dry) 4–5 / Rubbing (wet) 3–4 - Sublimation print: Wash 5/5 / Light 7 / Rubbing 4–4.5 - *Note: Wet rubbing fastness of 3–4 is a known limitation of disperse dyeing — relevant for dark colours worn in wet conditions.* **Tensile Strength** - 150D/48F polyester jersey: 350–450 N (wale), 280–380 N (course) — significantly above cotton equivalents - Seam strength at standard overlock: 250–320 N **MOQ Guidance** - Yarn (DTY): 500–2,000 kg per denier/color from Taiwanese and Chinese spinners; Indian producers from 1,000 kg - Greige fabric: 1,000–3,000 metres per construction from specialised polyester circular knitting mills - Finished T-shirts (CMT): 500–1,000 pieces per style/color (standard); larger factories from 2,000 pieces - rPET certified: Add 15–20% to MOQ minimums; GRS-certified mills require production run minimums of 2,000 kg yarn --- ## Manufacturing & Sourcing Considerations *What to know before you source.* **Knitting Machine Requirements** Polyester T-shirts are knitted on single-jersey circular knitting machines, 28–32 gauge for fine performance fabrics and 24–28 gauge for standard T-shirt jersey. Filament polyester (DTY) is more demanding on knitting tension settings than spun yarns — consistent tension is critical to prevent fabric barre (horizontal striping defect) that appears after dyeing. Birdeye and mesh constructions require machines with specific needle configurations — not all knitting mills carry this capability, so confirm before placing a development order. Sublimation printing is done on finished white fabric using flatbed or rotary heat press; the fabric must be a minimum 90% polyester for acceptable dye take-up. **Dyeing Compatibility** Polyester is dyed with disperse dyes under high-temperature/high-pressure conditions (HT/HP dyeing at 130°C). This is incompatible with cotton — polyester-cotton blends require two-bath dyeing (disperse for polyester portion, reactive for cotton portion), adding process time and cost. For 100% polyester, disperse dyeing achieves excellent reproducibility and right-first-time rates above 90% in well-controlled mills. Critical parameter: carrier-free dyeing at 130°C produces better fastness than carrier-assisted dyeing at lower temperatures, but requires mills equipped with proper HT/HP jet dyeing machines. For dark shades (navy, black), specify reduction clearing after dyeing — this removes surface disperse dye that would otherwise cause poor wet rubbing fastness. **Finishing Processes** - **Moisture-wicking finish (hydrophilic coating)**: Applied to standard polyester jersey to add wicking performance. Durable to 20–30 wash cycles (not permanent). Adds ₹10–₹20/metre. Distinguish clearly from knit-structure wicking (permanent) in your specification. - **Anti-pilling finish**: Relevant for staple polyester (spun yarn) constructions. Enzyme or chemical treatment. Adds 1–2 Martindale grades. - **Anti-static finish**: Polyester builds static charge; anti-static finish is recommended for direct skin-contact T-shirts, especially in low-humidity environments. Often paired with wicking finish. - **Softening**: Silicon-based softeners significantly improve polyester hand feel. Use non-yellowing variants for white and light-colour T-shirts. - **UV protection finish (UPF)**: Popular in outdoor T-shirts. Polyester's dense structure gives a base UPF of 30–50 even without finishing; finishing can push this to UPF 50+. **Quality Control Checkpoints** - Barre check (fabric inspected under raking light before dyeing): Catch knitting tension defects early - Shade matching (spectrophotometer, ΔE < 1.0): Polyester shade matching is precise; mills with inline spectrophotometry reduce lab-dip iterations - GSM verification (±5% tolerance) - Wash fastness and light fastness testing pre-bulk - Sublimation print: Colour gamut check against approved strike-off before bulk production run - Dimensional stability: Wash test on pre-production sample before pattern grading **Common Production Pitfalls** 1. Ordering standard jersey polyester and expecting wicking performance without specifying construction: The most common disconnect between brand brief and manufactured product. 2. Sublimation printing on blended fabrics below 85% polyester content: Results in washed-out, inconsistent colour reproduction. 3. Skipping reduction clearing on dark shades: Results in poor wet rubbing fastness — a common consumer complaint for dark polyester T-shirts. 4. Using carrier-assisted dyeing mills to save cost: Carriers (chemical dye aids) can leave residuals that cause skin sensitivity in direct-contact T-shirts. Specify carrier-free HT/HP dyeing. 5. Conflating rPET yarn certification with GRS fabric certification: The GRS chain of custody must cover yarn-to-fabric-to-garment. Buying GRS yarn but processing at a non-certified mill breaks the certification chain. **Lead Times** - Yarn procurement to finished garment: 35–55 days (polyester supply chains are faster than cotton) - rPET certified program: 45–65 days (certified yarn procurement adds time) - Sublimation print T-shirts: Add 7–14 days for artwork separation, strike-off approval, and printing - First-time orders with new factory: Budget 75–90 days including pre-production approvals **Key Sourcing Regions** - Yarn (DTY/FDY): Taiwan (Shinkong, Far Eastern), South Korea (Huvis, Toray), India (Reliance, Filatex) for rPET - Fabric knitting: China (Fujian, Guangdong) for volume; Vietnam and Bangladesh for integrated supply chains - CMT/Finished goods: Bangladesh (dominant for volume polyester T-shirts), Vietnam (growing), India (Tirupur for sublimation, Bangalore for CMT) - Sublimation printing specialists: India (Ahmedabad, Tirupur), China (Guangzhou), Bangladesh (Dhaka EPZ) --- ## Trade-Offs — Honest Assessment *Every fibre has limits. Here's the full picture.* **Strengths** - **Unmatched colorfastness and print compatibility.** Disperse dye on polyester achieves 5/5 wash fastness. Sublimation printing is structurally integrated into the fiber — physically impossible to crack, peel, or fade under normal use conditions. No other fiber offers this at commercial scale. - **Lowest shrinkage of any mainstream T-shirt fiber.** Dimensional stability post-wash is effectively zero for 100% polyester: under 1.5% in length and width. This is a manufacturing advantage (tighter size tolerance) and a consumer advantage (garment fits identically after 100 washes). - **Cost-competitive at scale with superior durability.** At ₹100–₹160/kg yarn cost, polyester is 30–50% cheaper than comparable cotton. Combined with 100+ wash cycle durability, cost-per-wear economics strongly favour polyester for high-volume programs. - **Quick-dry performance is genuine and measurable.** Polyester T-shirts air-dry in 30–60 minutes versus 2–4 hours for cotton equivalents. This is a functional consumer benefit, not a marketing abstraction — measurable by AATCC 199 moisture management test. - **rPET provides a credible sustainability narrative.** GRS-certified rPET from post-consumer bottles is now widely available, reduces carbon by 30–50% versus virgin polyester, and can carry on-garment certification labelling that resonates with consumers and retail buyers. - **Excellent abrasion resistance extends garment life.** PET fiber's tensile strength of 35–60 cN/tex means polyester T-shirts maintain structural integrity through intensive wear and washing, reducing replacement frequency and associated consumption. **Limitations** - **Microplastic shedding is an unresolved environmental problem.** Each wash cycle sheds an estimated 700,000–1,500,000 microplastic fibers from a synthetic garment. These pass through wastewater treatment systems and enter aquatic environments. Current mitigation options (Guppyfriend bags, Cora Ball) are consumer-side and not scalable. This is a genuine, growing liability — particularly for brands marketing environmental positioning. There is no current technical solution that eliminates shedding while maintaining polyester's performance properties. - **Comfort perception against skin is polarising.** Despite engineering advances, a segment of consumers consistently prefers the feel of cotton or natural fibers against their body in non-performance contexts. For casual T-shirts without a performance brief, polyester faces a positioning challenge in premium retail. Microfiber polyester (below 1 dpf) closes this gap substantially but adds 15–25% to yarn cost. - **Odour retention in repeated-wear scenarios.** Polyester's hydrophobic surface retains body odour compounds more persistently than cotton — particularly relevant for T-shirts worn during moderate physical activity. Odour-control finishes (silver-ion, zinc-based) are the standard mitigation but add cost and reduce wash durability of the finish. This is the most common consumer complaint about synthetic T-shirts and is widely documented in consumer research. - **Not suitable for reactive printing techniques.** Screen printing with water-based inks and DTG printing achieve poor adhesion on polyester without pretreatment. Discharge printing (for soft-hand graphics) does not work on polyester at all. The printing options for polyester are narrower than for cotton, which limits design execution in certain aesthetic categories. --- ## Cost Analysis *The economics of Polyester for T-Shirt Manufacturing.* **Yarn Cost (indicative, 2024–2025)** - Standard DTY 150D/48F (virgin): ₹100–₹140/kg - Fine denier DTY 75D/72F (virgin): ₹130–₹170/kg - Microfiber DTY 75D/144F: ₹160–₹220/kg - rPET DTY 150D (GRS-certified): ₹120–₹165/kg (10–20% premium over virgin) - Staple polyester 30s (spun, for blends): ₹110–₹150/kg **Estimated Cost-per-Garment (standard T-shirt, 160 GSM, 150D DTY)** - Fabric: ₹30–₹50 - Trims (label, thread, bag): ₹5–₹10 - CMT: ₹35–₹55 - Finishing + QC: ₹5–₹10 - **Total ex-factory (Bangladesh, volume): ₹75–₹125** - **Total ex-factory (India, mid-volume): ₹90–₹145** - *Sublimation-printed version: add ₹25–₹60/piece depending on coverage and complexity* **Cost-per-Wear Calculation** A polyester performance T-shirt at ₹399 retail with a functional lifespan of 120 wash cycles: ₹3.33 per wear. A comparable cotton T-shirt at ₹499 retail lasting 80 cycles: ₹6.24 per wear. For a corporate uniform program buying 5,000 polyester tees at ₹150 ex-factory (₹18 cost-per-garment factored into contract price), surviving 100 cycles before replacement: ₹1.50 per wear — substantially below any alternative fiber at equivalent quality. **Comparison with Alternative Fibers for T-Shirts** - **Cotton (30s ring-spun combed)**: 30–50% higher yarn cost, comparable CMT, significantly higher shrinkage control requirements. Better casual positioning; worse performance positioning. - **Cotton-poly blend (65/35)**: Bridges both segments — softer than pure polyester, more stable than pure cotton, sublimation-compatible at 65%+ polyester content. Yarn cost ₹130–₹170/kg blended. - **Pima / Supima cotton**: 3–4× yarn cost of polyester. Justified for luxury basics; not competitive in performance or volume tee categories. - **Bamboo viscose**: Comparable yarn cost to standard polyester but lower durability, higher shrinkage, and complex dyeing process. Relevant for natural-fiber positioning; not a performance substitute. **ROI for Brand Owners** Polyester's lower return rate due to shrinkage (estimated 60–70% reduction versus unsanforised cotton) and colour fading reduces reverse logistics cost. For a brand doing 20,000 units/month with 3% shrinkage-related returns on a cotton program, switching to polyester can eliminate 400+ returns/month — saving ₹60,000–₹120,000/month in logistics and restocking costs at standard domestic return processing rates. --- ## Sustainability Profile *Environmental and ethical considerations.* **Carbon and Water Footprint** Virgin polyester: 5.5–9.5 kg CO₂e per kg of fiber (range reflects regional energy mix — Chinese production higher than European). Water consumption in production: approximately 17 litres/kg of fiber — dramatically less than cotton's 10,000 litres/kg, which is polyester's most significant ecological advantage versus natural fibers. rPET reduces carbon by 30–50%: approximately 3–4 kg CO₂e/kg versus virgin, depending on collection and reprocessing efficiency. **Certifications** - **GRS (Global Recycled Standard)**: The primary certification for rPET. Covers chain of custody from bottle collection through yarn and fabric production. Required for on-garment 'recycled' claims in most retail channels. - **OEKO-TEX Standard 100**: Tests for harmful substances in finished fabric. Achievable for polyester; particularly important for direct skin-contact T-shirts given residual chemical concerns from dyeing and finishing. - **bluesign**: Comprehensive resource productivity and chemical safety standard for synthetic fabric production. Preferred by outdoor and performance brands; growing EU market requirement. - **ZDHC (Zero Discharge of Hazardous Chemicals)**: Wastewater treatment standard for dyeing mills. Increasingly required by European and North American retail buyers as a supply chain condition. **Microplastic Shedding: The Unresolved Issue** Each polyester garment sheds an estimated 700,000–1.5 million microfibers per wash cycle (Boucher and Friot, 2017; IUCN 2017 data). These accumulate in marine environments and have been detected in human blood and tissue. Tighter filament constructions (higher filament count per denier) shed less than loose staple constructions. This is currently the most material long-term ESG risk in polyester sourcing — monitor legislative developments in EU (microplastic filters for washing machines, scheduled 2025 regulations) that may create compliance requirements affecting polyester garment specifications. **Biodegradability** Polyester is not biodegradable under normal conditions. PET degrades over an estimated 20–200 years in landfill. Chemical recycling (PET depolymerisation back to monomers) represents the credible end-of-life pathway but infrastructure is nascent. Mechanical recycling (bottle-to-fiber) is mature and is the basis of current rPET supply chains, but cannot be repeated indefinitely without quality degradation. **Consumer Perception** In performance and activewear categories, polyester's functional story (wicking, durability, print capability) neutralises sustainability concerns when paired with rPET certification. In the casual basics and streetwear category, "polyester" as a fiber label still faces perception challenges versus cotton — microfiber blends and rPET certification are the two tools available to bridge this gap. --- ## FAQ *Polyester for T-Shirt Manufacturing — answered.* **1. What makes polyester better or worse than cotton for T-shirts?** Polyester wins in: colorfastness (sublimation and disperse dye outperform reactive cotton dyeing), moisture management when properly constructed, dimensional stability post-wash, and cost at scale. Cotton wins in: skin-contact comfort perception, breathability in still air (cotton's absorption buffers temperature), natural-fiber consumer trust, and suitability for soft-hand printing techniques like discharge and water-based screen print. The honest answer for a brand owner: if your T-shirt needs wicking, full-colour printing, or will be produced at 10,000+ units in a uniform program, polyester is the correct choice. If your T-shirt is a premium casual or streetwear piece where hand feel and 'natural' positioning matter, cotton is the correct choice. **2. What's the minimum order quantity for polyester T-shirt fabric?** For greige polyester jersey from Chinese or Taiwanese mills: 3,000–5,000 metres per construction per order, though stock fabrics in standard constructions (150D plain jersey) are available from stock from trading companies at 500–1,000 metre minimums. For custom GSM or construction: 2,000–3,000 metres. For rPET GRS-certified fabric: typically 3,000–5,000 metres as certified mills require larger runs for chain-of-custody documentation. Finished T-shirt MOQ varies: Bangladesh CMT factories from 1,000 pieces per style-colour; Indian sublimation print specialists from 200 pieces (higher per-unit cost). **3. How does polyester perform after 30+ wash cycles?** Very well — this is one of polyester's strongest attributes. Dimensional change after 50 wash cycles (40°C, standard home laundering): under 2% for 100% polyester constructions. Colorfastness: disperse-dyed polyester maintains shade consistency through 80+ washes with no visible fading under standard conditions. Sublimation prints: effectively permanent — no crack, peel, or colour change through 100+ cycles. Pilling in filament constructions: Grade 4+ maintained through 80 washes. The primary degradation indicator at 50+ cycles is handle softening and minor surface snag accumulation, not colour or dimension failure. This durability profile is why polyester dominates uniform and sportswear categories where consistent appearance through heavy use is a procurement requirement. **4. What GSM should I specify for polyester T-shirts?** For performance sports tees: 120–150 GSM (lightweight, maximum breathability in open constructions). For standard branded T-shirts and corporate uniforms: 150–180 GSM (balance of comfort, durability, and cost). For premium retail T-shirts requiring structured hand: 180–210 GSM. Note that polyester reads lighter than cotton at equivalent GSM due to lower fiber density — a 160 GSM polyester tee has similar fabric body to a 175 GSM cotton tee. Don't over-specify GSM to compensate for hand feel; instead, specify finer denier (sub-75D microfiber) for better hand at lower GSM. **5. Is polyester suitable for sublimation printing on all T-shirt styles?** Polyester must be a minimum of 85–90% of the fabric composition for sublimation printing to achieve full-gamut colour reproduction. At 65% polyester (common in cotton-poly blends), sublimation produces output with approximately 60–70% of the colour density of 100% polyester — acceptable for some applications but not for photographic-quality prints. 100% polyester delivers the complete sublimation capability. The fabric must be white or very light grey for sublimation — the process does not work on pre-dyed fabric. Sublimation is permanent and cannot be removed or overprinted, so colour and artwork approval at the strike-off stage is non-negotiable before bulk production. **6. What certifications should I look for when sourcing polyester T-shirt fabric?** At minimum: OEKO-TEX Standard 100 for harmful substance safety (critical for direct skin contact). For rPET claims: GRS (Global Recycled Standard) covering the full chain from yarn through finished fabric. For chemical safety in production: bluesign or ZDHC-compliant mill certification — increasingly a non-negotiable requirement from European and US retail buyers. For sublimation inks: verify REACH and OEKO-TEX compliance of ink formulations independently, as the garment OEKO-TEX certification does not automatically cover post-fabric printing processes. **7. How does polyester handle odour in T-shirts worn repeatedly?** This is polyester's most significant performance limitation for everyday casual T-shirts. Hydrophobic fiber surfaces trap sebum and body odour compounds more persistently than cotton. After 2–3 consecutive wears, polyester T-shirts typically retain odour even after washing at 40°C — a consumer complaint well-documented in category research. The primary mitigation is silver-ion antibacterial finish (Microban, HeiQ Fresh, AgPure) which has demonstrated odour reduction of 70–85% in EN ISO 20645 testing, durable to 30–50 wash cycles. For T-shirts where multiple-wear odour control is a key product promise, specify silver-ion finish at the greige fabric stage and request wash durability data to 30 cycles. **8. What's the typical lead time for polyester T-shirt orders?** Standard 100% polyester T-shirt with solid colour or sublimation print: 35–55 days from order confirmation to ex-factory delivery in Bangladesh or Vietnam. Stock-fabric programs (using pre-stored greige): 25–35 days. rPET programs with GRS documentation: 45–65 days (certified yarn procurement adds 10–15 days). Sublimation print adds 7–14 days for artwork separation, strike-off approval, and printing within the standard lead time. For first-time orders, budget 75–90 days including factory audit, pre-production sample approval, and lab-dip confirmation. Repeat programs with pre-approved specifications and established supplier relationships typically run in 30–40 days. --- ## Related Links **Alternative Fibers for T-Shirt Manufacturing** - [Cotton](/yarn/cotton/t-shirt-manufacturing) - [Pima Cotton](/yarn/pima-cotton/t-shirt-manufacturing) - [Organic Cotton](/yarn/organic-cotton/t-shirt-manufacturing) - [Bamboo](/yarn/bamboo/t-shirt-manufacturing) - [Tri-Blend](/yarn/tri-blend/t-shirt-manufacturing) - [Viscose](/yarn/viscose/t-shirt-manufacturing) - [Egyptian Cotton](/yarn/egyptian-cotton/t-shirt-manufacturing) - [Cotton-Poly Blend](/yarn/cotton-poly-blend/t-shirt-manufacturing) - [Supima Cotton](/yarn/supima-cotton/t-shirt-manufacturing) **Other Applications for Polyester** - [Activewear](/yarn/polyester/activewear) - [Sportswear](/yarn/polyester/sportswear) - [Workwear](/yarn/polyester/workwear) - [Hoodies & Sweatshirts](/yarn/polyester/hoodies-sweatshirts) - [Polo Shirts](/yarn/polyester/polo-shirts) - [Athleisure](/yarn/polyester/athleisure) **Glossary** - [GSM](/glossary/gsm) - [Colorfastness](/glossary/colorfastness) - [Pilling](/glossary/pilling) **Compare** - [Polyester vs. Alternatives](/compare/polyester)