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Views: 0 Author: KIGI TEXTILE Publish Time: 08-30-2026 Origin: KIGI TEXTILE Research
UV claims on outdoor fabrics are only useful when the test method, specimen condition and labeling rule are clear. AATCC 183-2014 (AATCC TM183:2010 reaffirmed 2014) is a laboratory method for measuring how much erythemally weighted ultraviolet radiation is transmitted or blocked by textile fabrics. It is widely used to calculate Ultraviolet Protection Factor (UPF) for apparel and related outdoor textiles.
Buyer summary: AATCC TM183 measures UV transmittance and supports UPF calculation under defined laboratory conditions. It does not by itself authorize a finished-garment “UV protective” label. For U.S.-style labeling programs, buyers usually combine TM183 with specimen preparation and labeling rules such as ASTM D6544 and ASTM D6603.
AATCC Test Method 183 is titled for transmittance or blocking of erythemally weighted ultraviolet radiation through fabrics. In practice, a spectrophotometer or UV transmittance system measures radiation passing through the fabric across the UV range used by the method (commonly discussed as about 280–400 nm, covering UVB and UVA). The result is used to calculate UPF and related transmittance / blocking values.
The 2014 reference many buyers still write as “AATCC 183-2014” corresponds to the 2010 edition reaffirmed in 2014. Later revisions of TM183 exist. New purchase specs should state the exact edition required by the brand or laboratory, not only the letters “AATCC 183.”
Important: “Tested to AATCC 183” only identifies the method. A usable report should also show UPF, UVA/UVB transmittance or blocking, specimen state (dry/wet, stretched or not, laundered or not), and the agreed acceptance target.
| Report Item | Why Buyers Care |
|---|---|
| UPF (Ultraviolet Protection Factor) | Primary communication number for sun-protective apparel programs |
| UVA transmittance / blocking | Shows long-wave UV behavior through the fabric structure |
| UVB transmittance / blocking | Often more critical for erythema (sunburn-related) weighting |
| Specimen condition | Dry vs wet, new vs prepared, stretched vs relaxed can change results |
UPF is not the same as consumer sunscreen SPF. It is a fabric transmission metric derived from spectral data and erythemal weighting. A higher UPF means less erythemally weighted UV passes through the tested specimen under the method conditions.
Buyers often confuse the measurement method with the labeling package. A practical sourcing map is:
| Standard | Role | Buyer Takeaway |
|---|---|---|
| AATCC TM183 | Measures UV transmittance / blocking; supports UPF calculation | Ask for the method edition and full numeric results |
| ASTM D6544 | Prepares fabrics before UV transmission testing (use-condition simulation) | Define whether you need “as received” only or prepared/laundered/exposed states |
| ASTM D6603 | Labeling guidance for UV-protective textiles | Do not treat a single TM183 number as automatic hangtag approval |
If a brand asks for “UPF 50+ fabric,” clarify whether that means: (1) a TM183 result on a new dry specimen, (2) a prepared-for-testing result after D6544 conditioning, and (3) a labeling claim under D6603 or another market rule.
Tighter constructions, higher cover factor and darker or deeper shades often reduce UV transmittance. Open meshes, lighter colors and low-gsm fabrics may need denser constructions, special yarn systems or UV finishes to reach a buyer’s UPF target.
Colorants can change UV absorption. A white or pale lab dip should not be assumed equal to a dark bulk colorway. Printed camouflage or pattern areas may also behave differently from solid grounds.
UV absorbers, denser coatings and reflective films can improve blocking. For example, silver-film or metallized constructions are often selected when buyers want UV reflection plus opacity in tent or outdoor components—see our 20D nylon silver film grid ripstop. Always retest the finished construction, not only greige cloth.
Stretching can open the structure and raise transmittance. Wet testing can also change results. If garments will be worn wet, stretched or repeatedly washed, specify those states in the sourcing brief.
Many apparel programs communicate UPF in bands such as 15, 30, 50 and 50+. Exact classification and labeling language depend on the market rule you adopt (for example ASTM D6603 in U.S.-oriented programs, or other regional systems such as AS/NZS 4399). Do not copy a competitor hangtag number onto a different fabric without a matching report.
| Common Claim Style | Buyer Check |
|---|---|
| UPF 30 / 50 / 50+ | Confirm method edition, specimen state and report average/minimum rules |
| “UV resistant” without UPF | Too vague for technical apparel; ask for numeric TM183 data |
| “Blocks 99% UV” | Ask whether this is marketing language or tied to measured transmittance |
Send more than “need UPF 50 fabric.” Include:
Recommended approach: Approve a production-representative sample in the bulk color and finish, then keep the same construction for bulk verification.
No. It is a test method for measuring UV transmittance/blocking and calculating UPF. Labeling and marketing claims usually need additional preparation and labeling rules, plus your own acceptance criteria.
No. AATCC 183 is the method. UPF 50+ is a performance communication level that must be supported by measured results and the labeling system you follow.
That depends on end use. Dry new-state testing is common for development baselines. If garments are worn wet or after washing, ask for the matching condition in the report.
Yes, when construction, color and finish are engineered for the target. Recycled content or fluorine-free waterproofing does not automatically determine UPF—test the finished fabric.
Many labs and specs still reference the 2010 edition reaffirmed in 2014. Later TM183 revisions exist. Write the exact edition required by your brand or destination market.
Choose UV fabrics by matching construction and finish to the end use, then verify with AATCC TM183 data under the specimen conditions that matter. Use labeling standards only when your market claim requires them. Clear specifications reduce sampling loops and claim risk.
Tell KIGI Textile your end use, target UPF, fiber preference, gsm, color and required test condition. We can help develop nylon and polyester outdoor options—including silver-film and UPF-oriented constructions—and prepare samples for evaluation.
Technical reference: AATCC TM183, Transmittance or Blocking of Erythemally Weighted Ultraviolet Radiation through Fabrics (commonly cited as AATCC 183-2014 for the 2010 edition reaffirmed 2014). This buyer guide does not reproduce or replace the official standard or any labeling regulation.
