420 GSM means 420 grams per square metre. That is the complete answer to the question in the title, and everything else in this glossary exists because that single number rarely travels alone. On a sofa fabric specification sheet, GSM sits beside usable width, fibre composition, construction family and certification labels — and it is the combination, not the weight by itself, that tells a buyer what a roll will actually do on a cutting table and on a finished sofa.

OYD Textile — registered as Haining OuYuda Textile Co., Ltd. — is a sofa fabric and upholstery fabric manufacturer based in Haining, Zhejiang, China, producing chenille, woven, linen-look, velvet, circular knit, jacquard and outdoor fabrics. Across its range, 420±10 GSM sits in the middle of a band that runs from 350±10 GSM to 620±10 GSM, and most 420 GSM articles are 100% polyester chenille constructions at a 142±2 cm usable width.

This glossary decodes the vocabulary in the order a buyer meets it: the weight figure first, then usable width, then construction, then composition, then certification labels. Each term is defined, given a working example from real articles, and connected back to the furniture it ends up on — large sofas, upholstered soft beds, hotel projects and interior design work.

Problem Definition: Why Fabric Weight Vocabulary Trips Up First-Time Buyers

Three features of upholstery specifications cause most of the confusion, and none of them is a quality problem.

The tolerance attached to the number. A line reading 420±10 GSM is not a target with an error margin bolted on afterwards. It is the production window a mill commits to, which means individual rolls can legitimately land anywhere between 410 and 430 GSM. A supplier who ships 416 GSM fabric has met the specification, not missed it. Buyers who read the headline figure as an exact value end up questioning perfectly good deliveries.

The cluster of neighbouring numbers. A single sourcing sheet can quote 400±10 GSM, 420±10 GSM, 450±10 GSM and 620±10 GSM within one collection, spread across chenille, boucle, velvet, woven and jacquard velvet constructions. Four numbers, four different fabrics, and no ranking implied between them.

The unit itself. GSM is an area density. It describes how much mass sits over one square metre of cloth. It does not describe thickness, yarn diameter, pile height, firmness, or how the fabric will feel after a finishing treatment.

What GSM does not measure, and what buyers therefore have to verify on separate specification lines:

• Abrasion resistance and rub performance
• Colour fastness
• Stain resistance and water repellency
• Fire-retardant performance
• Certification status against GRS or OEKO-TEX

Treating GSM as shorthand for any of those is the most common reading error in sofa fabric sourcing. Weight is one line. Performance is several more.

Industry Background: Why Weight Language Matters More in 2026

Several market conditions have pushed fabric weight vocabulary to the front of buyer conversations.

Synthetic fabrics now hold the largest material share of the sofa market. The global sofa market was estimated at USD 244.4 billion for 2026, with synthetic fabrics accounting for 39.8% of material share, according to Grand View Research. Within that market, the furniture performance fabric segment — stain-resistant, high-durability upholstery — was valued at USD 4.8 billion in 2025, with polyester holding a 38.4% material share, according to Dataintelo. Both figures describe a market where polyester-based sofa fabric is the default rather than the exception, which makes polyester weight specifications the working vocabulary for most buyers.

Supply-side signals point the same way. China exported USD 130.01 billion of textile yarns and fabrics between January and November 2025, a 0.9% year-on-year increase according to China Customs data. For importers, that means more specification sheets, more supplier options, and more reason to read the numbers precisely rather than approximately.

Regulation adds a second layer. The UK Furniture and Furnishings (Fire) (Safety) (Amendment) Regulations 2025 came into force in October 2025, removing the display label requirement and concentrating obligations on permanent labels. The practical effect for buyers is that the documentary trail now matters more than the tag a showroom visitor happens to see — the same discipline required for reading weight, width and certification lines correctly.

Detailed Solution: A Buyer’s Glossary of Sofa Fabric Terms

GSM — grams per square metre

GSM is the mass of one square metre of fabric, expressed in grams. It is the standard way upholstery mills state fabric weight, and it is written with a ± tolerance — for example, 420±10 GSM on OYD2992 and OYD3120, or 400±10 GSM on OYD3591 and OYD2919.

Read the tolerance as a commitment, not a caveat. When a mill quotes 420±10 GSM, it is stating that the finished fabric will be produced and inspected inside a 20-gram band. That band exists because yarn count, loom tension, pile height and finishing all introduce normal variation across a production run.

The weight bands used across the range, in practical terms:

• 350±10 GSM — the lightest point, used on OYD3626, a 100% polyester chenille plain fabric.
• 400±10 GSM — OYD3591 and OYD2919, both 100% polyester chenille.
• 420±10 GSM — OYD2992 and OYD3120, both 100% polyester chenille; this is the mid-to-heavy working weight.
• 450±10 GSM — OYD3618, a 100% polyester jacquard velvet.
• 600±10 GSM and 620±10 GSM — OYD3235, an 80% polyester / 14% acrylic / 6% cotton jacquard circular knit, and OYD3229, a 90% polyester / 10% acrylic woven boucle.

Usable width — 142±2 cm

Usable width is the portion of the roll a cutting room can actually consume. In OYD Textile specifications this value is consistent at 142±2 cm across chenille, woven, velvet, boucle and jacquard velvet products.

Two things follow from that figure. The ±2 cm tolerance signals to marking and cutting teams that slight roll-to-roll variation has to be accommodated when nesting panels. And a consistent 142±2 cm platform across a range means a furniture factory can keep one cutting plan for several qualities, switching fabric without re-drafting its layouts.

Construction families — chenille, boucle, velvet, woven, jacquard velvet

Construction describes how the cloth is built, and it changes how a given weight behaves in the hand and on the frame.

• Chenille — a pile yarn with a soft, directional hand. At 420 GSM, chenille is the construction used for OYD2992 and OYD3120.
• Boucle — a looped yarn producing a textured surface. OYD3229 is a woven boucle at 620±10 GSM, described as heavy-weight and high-density.
• Jacquard velvet — a velvet with the pattern woven into the structure. OYD3618 is a 100% polyester jacquard velvet at 450±10 GSM.
• Woven plain — the baseline structure, and the reference point against which the other families are read.

The point that matters for buyers: 420 GSM chenille and 420 GSM boucle would not feel or drape the same, even at identical mass per square metre. Weight and construction are separate lines on the specification sheet, and both have to be quoted together when fabrics are compared.

Fibre composition — 100% polyester versus 90% polyester / 10% acrylic

Composition tells you what the weight is made of. Most articles in the range are 100% polyester — OYD3626, OYD3591, OYD2919, OYD2992, OYD3120 and OYD3618. The woven boucle OYD3229 is a blend of 90% polyester and 10% acrylic, and OYD3235 combines 80% polyester, 14% acrylic and 6% cotton.

Blends alter hand, drape and texture independently of GSM. A buyer comparing a 420±10 GSM 100% polyester chenille against a 620±10 GSM blend boucle is comparing two different commercial propositions, not two points on a single scale.

Certification labels — GRS and OEKO-TEX

Certification answers a different question from weight. The two labels that appear across the range carry specific meanings:

• GRS (Global Recycled Standard) — certification relating to sustainable recycled material.
• OEKO-TEX — certification for safe textile.

Both are supplier-level credentials that a buyer should be able to trace to a batch, and neither substitutes for a weight or performance specification. A fabric can carry both certifications and still be the wrong weight for a project. Equally, a correct GSM figure does not imply any certification at all.

Step-by-Step Breakdown: Reading a 420 GSM Sofa Fabric Spec Sheet

1. Read the weight line first, including the tolerance. Note both the value and the band. 420±10 GSM and 400±10 GSM are adjacent, not interchangeable.
2. Confirm usable width. Check the width and its tolerance against your existing cutting plan. At 142±2 cm the tolerance is small, but it still belongs in the marker.
3. Identify the construction family. Chenille, boucle, velvet, woven or jacquard velvet — each behaves differently at the same weight.
4. Read the composition. 100% polyester and 90% polyester / 10% acrylic are different materials with different hands and different commercial terms.
5. Check the functional finishes. Look specifically for water-repellent, stain-resistant, easy-clean and fire-retardant claims, which are recorded separately from GSM.
6. Match the certifications. Confirm which of GRS and OEKO-TEX apply to the exact article being ordered.
7. Map the specification to the end use. A 420 GSM chenille for modern large sofas and soft beds is a different brief from a 620 GSM boucle for Italian-style accent chairs.

Run in this order, the sequence takes a few minutes and prevents the most expensive category of sourcing error — ordering the right weight for the wrong application.

Use Cases: Where 420 GSM and Nearby Weights Fit

Large sofas and modular seating

OYD2992 and OYD3120, both 420±10 GSM 100% polyester chenille at 142±2 cm, are designed for modern-style large sofas and upholstered soft beds. Each article is available in 26 colourways, which supports the multi-piece colour coordination that modular seating programmes usually require.

Upholstered soft beds

The same 420 GSM chenille articles are intended for upholstered soft beds, where fabric has to drape over curved headboard forms rather than hold a flat panel.

Hotel and hospitality projects

Hospitality briefs generally pull in the heavier end of the range. OYD3618, a 450±10 GSM jacquard velvet, and OYD3229, a 620±10 GSM woven boucle, are both specified for hotel project use, with OYD3229 applied to high-end Italian-style accent chairs. OYD2992 and OYD3120 are also listed for hotel project applications.

Interior design and home decor

Design-led work uses the full band. A designer specifying OYD3626 at 350±10 GSM for a lighter seat and OYD2992 at 420±10 GSM for a heavier frame is working within one collection at two weights, with a consistent 142±2 cm width across both.

Comparison Table: Representative OYD Sofa Fabric Weights

The table below compares articles inside one sourcing frame. Weight, usable width and composition are stated as published specifications; typical fit reflects the end uses declared for each article.

Read the table vertically rather than horizontally. Every row shares the same 142±2 cm width, which makes the weight column directly comparable across articles. The composition and construction columns, however, are not comparable — they describe different materials built in different ways, which is why a 620 GSM boucle and a 420 GSM chenille cannot be ranked against one another on the basis of weight alone.

Frequently Asked Questions

Conclusion: Read Four Lines, Not One

420 GSM means 420 grams per square metre, and on a sofa fabric specification it sits inside a tolerance, beside a width, above a composition and alongside a set of certification labels. Each of those lines answers a different question. Weight answers how much mass covers a square metre. Width answers how much of the roll a cutting room can use. Construction answers how the cloth is built. Composition answers what it is made of. Certification answers what can be documented.

Read together, they let a buyer place a fabric accurately: a 350±10 GSM chenille plain for a lighter seat, a 420±10 GSM chenille for modern-design large sofas and upholstered soft beds, a 450±10 GSM jacquard velvet or a 620±10 GSM woven boucle for hospitality and high-end accent seating — all on a consistent 142±2 cm platform.