Consider a common scenario: an importer receives a textile lab test report from the factory, opens the PDF, and cannot tell whether the numbers on it are good or bad. The file gets saved, the shipment gets approved — and months later, customer reviews describe exactly the problem the report had quietly flagged.
A textile lab test report is the cheapest insurance in textile importing: a modest testing budget measured against a container of unsellable goods. But most buyers treat the PDF as a checkbox — received, filed, never understood. This guide teaches you to read the physical test families that matter, the chemical items to watch, the grading scales behind them, and which standards to request before production starts.
Key takeaways
- Most textile grades run on a 1–5 scale where 5 is best — but light fastness runs 1–8, so always check which scale a number belongs to.
- The physical test families buyers need are: colorfastness, pilling, strength (tensile/tear/seam), dimensional stability (shrinkage), and fiber content.
- Chemical items — formaldehyde, pH value, azo dyes, heavy metals — are read as pass/fail against the applicable regulation or customer standard, never against a number remembered from the internet.
- Colorfastness to washing and to rubbing are the two tests that predict the most common customer complaints: fading and dye transfer.
- Always require the test method and standard number on the textile lab test report (e.g. ISO 105-C06, AATCC TM8) — a grade without a named method is not comparable between labs.
What does a textile lab test report actually contain?
A textile lab test report is a lab’s record of how a fabric sample performed against named, standardized test methods. Each result line typically shows four things: the property tested (e.g. “colorfastness to washing”), the method used (e.g. “ISO 105-C06” or “AATCC TM61”), the test conditions (temperature, cycles, load), and the graded result. The method matters as much as the grade — two labs can test the “same” property differently, and only the method number makes results comparable.
For wholesale buyers, the practical use of a report is threefold: approve or reject a bulk fabric before cutting, set a contractual quality floor in the purchase order, and keep a paper trail if a defect claim arises later. A report you cannot read serves none of these purposes. Where chemical compliance is the concern rather than physical performance, see our OEKO-TEX and REACH compliance guide for the regulatory side.
How do you read colorfastness grades?
Colorfastness measures how well a fabric keeps its color under washing, rubbing, light, perspiration, and water exposure. Almost all colorfastness grades use a 1–5 grey scale where 5 means no change and 1 means severe change — with one major exception noted below. Each test reports two numbers: the color change of the sample itself, and the staining of adjacent undyed fabrics.
| Test | What it predicts | Commonly requested minimum |
|---|---|---|
| Colorfastness to washing | Fading and bleeding in the customer’s laundry | Grade 3–4 or higher for apparel and throws |
| Colorfastness to rubbing — dry | Dye transfer onto furniture, car seats, light clothing | Grade 3–4 or higher |
| Colorfastness to rubbing — wet | Dye transfer when damp (sweat, rain, spills) | Commonly a grade below dry; confirm per product |
| Colorfastness to light | Fading in sunny rooms and shop windows | Grade 4+ on a 1–8 scale for home textiles near windows |
| Colorfastness to perspiration | Discoloration on cushion covers, apparel | Grade 3–4 or higher |
Three reading notes. First, light fastness uses a 1–8 blue wool scale, not 1–5 — a “grade 4” in light fastness is mid-scale acceptable, while a “grade 4” in washing fastness is good. Mixing up the scales is the classic misread. Second, wet rubbing almost always grades lower than dry rubbing; do not reject a fabric solely because wet rubbing is half a grade lower — compare it against your written minimum instead. Third, dark and saturated colors (black, navy, deep red) are inherently harder to make fast than pastels, so set minimums per colorway, not one blanket number for the whole order. The numbers above are commonly requested starting values — write your own minimums into the spec and confirm them with the factory. The AATCC test methods catalog lists the current method numbers behind these tests, including TM61 (colorfastness to laundering) and TM8 (crocking), so a report citing them is traceable.
What is the pilling grade, and why does it matter?
Pilling is the formation of small fiber balls on a fabric’s surface from abrasion — the “looks old after a few washes” complaint. Labs test it with a Martindale or random-tumble tester for a set number of cycles, then grade the surface 1–5 against photographic standards, where 5 means no pilling.
For buyers, the pilling grade is one of the best predictors of how a throw, cushion cover, or rug will look in customer photos after real use. Faux fur and fleece are judged partly on pile appearance rather than classic pilling, but the principle holds: the visible face fabric is what the customer sees, so that is where the grade must be acceptable.
What counts as acceptable depends on the product’s price tier and visibility. As a rough working frame many buyers use: grade 4 and above for premium face fabrics, grade 3–4 acceptable for mid-tier everyday products, and below grade 3 a red flag on anything the customer sees and touches daily. Put your minimum in the purchase order — for example, “pilling grade ≥ 3–4 by ISO 12945-2 after the agreed cycle count” is a sentence that prevents arguments later. Cycle counts vary by product type (upholstery fabrics are commonly tested to much higher cycles than throws), so agree the cycle count with the lab or factory before testing.
What do tensile strength, tear strength, and seam slippage tell you?
Strength tests measure whether the fabric — and the seams joining it — survive real use. They are reported in Newtons (N), not grades, so you read them against a minimum value rather than a scale. Tensile strength is the force needed to pull the fabric apart; tear strength is the force needed to continue an existing tear; seam strength and slippage measure whether stitched seams hold under load and whether yarns slide away from the stitch line.
- Tensile strength — low values mean throws that rip at the hem and cushion covers that burst at the seams.
- Tear strength — matters for products with cut edges, fringe, and tassels, where a small nick becomes a long rip.
- Seam strength and seam slippage — critical for cushion covers, duvet covers, and anything stuffed or sat on.
- Bursting strength — used for knitted fabrics (jersey, fleece) instead of tensile; measures resistance to pressure from behind, like a knee on a floor cushion.
There is no universal “good” number — acceptable strength depends on fabric weight and product use. The practical buyer move: ask the factory for the values its fabric achieves, compare across two or three suppliers, and be suspicious of any quote that cannot produce a number at all. A supplier with no strength data has no strength control. For the methods behind these figures, ASTM’s textile committee overview describes the standard test methods for pilling, colorfastness, and fabric strength that most third-party labs follow.
What about chemical test items like formaldehyde and pH?
Chemical items on a textile lab test report — formaldehyde, pH value, azo dyes, heavy metals — are read differently from physical grades: they are typically pass/fail against a regulation or a customer’s restricted-substance list. Do not judge them against a number remembered from the internet; the applicable limit lives in the regulation, the standard, or the report’s own “requirement” column.
What each item means, in plain terms:
- Formaldehyde — a residual from certain resins and easy-care finishes; relevant for fabrics with wrinkle-resistant or stiffening treatments.
- pH value — the acidity or alkalinity of the fabric extract; skewed pH can irritate skin, which is why it matters most for products with direct skin contact.
- Azo dyes — screening for dyes that can release restricted aromatic amines; a concern mainly for deeply dyed fabrics in regulated markets.
- Heavy metals — screening for metals such as lead or cadmium carried by certain dyes and pigments, particularly in prints.
Where the pass/fail line comes from: your customer’s restricted-substance list first, then the market’s regulation (REACH Annex XVII in the EU, CPSIA-related rules in the US), or a certification such as OEKO-TEX Standard 100. The OEKO-TEX Standard 100 page explains how product classes set the testing scope — use the current edition of the standard for the actual limit values. Reading habit: if the report’s requirement column shows a named requirement and the result is “pass” or “not detected,” file it; if the requirement column is blank, ask the lab what the result was judged against.
Will the fabric shrink? Reading dimensional stability results
Dimensional stability — shrinkage and stretch after washing — is reported as a percentage change in length and width (negative for shrinkage). A “-3%” result means the fabric shrank 3% in that direction. Many buyers work to around ±3% for woven home textiles after washing, but the right limit depends on the product: a 3% shrink on a 200 cm throw is 6 cm, which a customer draping it over a sofa will notice.
Two things to check on the report: the wash conditions (temperature and cycle — a test at 30°C says nothing about a customer washing at 60°C) and whether the result is after one wash or multiple. Request the conditions that match your care label. If your label says “machine wash warm,” the lab test should be run warm — otherwise the report is testing a scenario your customer will never follow.
Which test standards should importers actually request?
You do not need every test in the catalog. A focused pre-production test package for most home textiles covers: fiber content analysis, colorfastness to washing, colorfastness to rubbing (dry and wet), pilling, dimensional stability — plus, for the relevant market, any restricted-substance screening your compliance plan requires.
On methods: ISO and AATCC are the two dominant systems, and either is fine as long as it is named on the report. Common pairs buyers encounter: ISO 105-C06 / AATCC TM61 (washing fastness), ISO 105-X12 / AATCC TM8 (rubbing), ISO 12945-2 / ASTM D4970 (pilling, Martindale / random tumble). When comparing quotes from two factories, require the same method from both — a grade 4 by one method is not interchangeable with a grade 4 by another.
Finally, confirm which lab issued the report and whether the sample was bulk fabric or a lab dip. A glowing report on a lab-dip swatch tells you the color is achievable; it tells you nothing about the bulk fabric actually being cut. For the first order with a new factory, test bulk fabric — the small extra cost is the entire point. Our color consistency guide explains what lab dips can and cannot prove across reorders.
Requesting a quote: specs to confirm
When you request a quotation, lock the test package into the spec in writing — the report is only as useful as the instructions behind it:
- Test package — which items are tested, each with a named method and standard number (ISO or AATCC). A grade without a method number is not comparable between labs.
- Test conditions — wash temperature, cycle count, rubbing cycles: matched to the care label, not to the lab’s default.
- Sample identity — bulk fabric or lab dip, named on the report; for a first order with a new factory, bulk fabric.
- Minimum grades — your per-item minimum, per colorway (dark colors judged separately), written into the purchase order.
- Lab — an accredited third-party lab named in the PO; the report must show the article, colorway, date, parameters, and the requirement each result is judged against.
- Chemical panel — which restricted-substance screening applies for the destination market, and whose limit (regulation, customer RSL, or certification) each chemical item is judged against.
Frequently asked questions
What is a good pilling grade for wholesale throws and cushion covers?
Grade 4 and above suits premium face fabrics; grade 3–4 is commonly accepted for mid-tier everyday products. Below grade 3 on a visible, frequently touched surface commonly produces visible wear complaints. Always specify the test method, cycle count, and your minimum grade in the purchase order — see the pilling section above for the full working frame.
Why does light fastness use a different scale?
Colorfastness to light is graded 1–8 on the blue wool scale, while most other colorfastness tests use a 1–5 grey scale. A grade 4 means “acceptable mid-scale” in light fastness but “good” in washing fastness — check which scale applies before judging any number on a report.
How much shrinkage is acceptable in home textiles?
Many buyers work to around ±3% for woven home textiles after washing, but the right limit depends on product and care label. What matters more than any single number is that the lab test used the same wash temperature and cycle as your care label instructs.
What do “not detected” and “pass” mean on chemical items?
They mean the lab did not find the substance above the detection limit of the named method, judged against the requirement stated in the report. The requirement is the operative part: the same result can pass one customer’s RSL and fail another’s. If the requirement column is blank, the result is information, not a verdict.
Should I test the lab dip or the bulk fabric?
Both have roles: lab-dip testing confirms the color and recipe are achievable, while bulk-fabric testing confirms what was actually produced. For a first order with a new factory, always test bulk fabric — that is the material your customers will receive.
How do I compare textile lab test reports from two different factories?
Require the same named test method (ISO or AATCC number) and the same test conditions from both. A grade without a method number is not comparable. Also verify the sample description — bulk fabric versus lab dip — is equivalent before comparing numbers.
Sources & Further Reading
- AATCC — Test Methods Catalog: the method numbers behind wash fastness (TM61), dimensional change (TM135), fiber analysis (TM20), and crocking (TM8)
- ASTM — Fashioning Standards for Textiles: the standard test methods for pilling, colorfastness, and fabric strength used in third-party lab reports
- Hohenstein — OEKO-TEX Standard 100: product classes by skin contact and component-level testing scope — the framework behind chemical-item limit values
- Cornovo Home — OEKO-TEX and REACH Compliance for Textiles Sold in the EU: certificates, restricted-substance lists, and importer verification
Setting up a testing protocol for your textile program? We run buyer-specified test packages on every bulk fabric — pilling, colorfastness, shrinkage, strength, and the chemical items your market requires — with grades confirmed before cutting. Send your product specs and required test items for a quotation.