16 CFR Part 1610: Flammability of Clothing Textiles

16 CFR Part 1610 is the federal flammability standard for clothing textiles. It sets a burn test, sorts fabrics into three classes based on how fast they ignite, bans the fastest-burning class from apparel, and requires domestic manufacturers and importers to certify that their fabric meets the standard. The Consumer Product Safety Commission enforces it under the Flammable Fabrics Act, and shipping non-compliant fabric can lead to seizures, recalls, and civil penalties reaching into the millions.¹

What the Standard Covers

Part 1610 applies to any fabric intended for clothing, whether it is sold as a finished garment or as raw material headed toward one. If a person could wear it, assume the standard reaches it.²

Three narrow carve-outs exist. Hats are excluded unless they extend to cover the neck, face, or shoulders. Gloves are excluded when they measure 14 inches or less and are not attached to another garment. Footwear is excluded provided it does not include hosiery and is not part of a larger garment.² A long evening glove that runs past 14 inches falls back under the rule.

Children’s sleepwear is not covered by Part 1610. It sits under 16 CFR Parts 1615 and 1616, which require the fabric to self-extinguish rather than merely burn slowly.³ Classifying a sleepwear item as general apparel to avoid the stricter regime is one of the more damaging compliance mistakes in this area.

For general adult apparel, third-party lab testing is not required. Manufacturers and importers can test internally and certify their own results through a General Certificate of Conformity.⁴

Fabrics That Don’t Need to Be Tested

Two categories of fabric are exempt from the burn test when a company issues a guaranty of compliance:

Plain-surface fabrics weighing 2.6 ounces per square yard or more, regardless of fiber content.
Fabrics made entirely from acrylic, modacrylic, nylon, olefin, polyester, wool, or any combination of those fibers, at any weight, plain-surface or raised.

These materials have consistently tested as Class 1 across decades of laboratory data, which is why the regulation waives the testing step.⁵ When an exemption applies, no General Certificate of Conformity is required either.⁴ The exemption only removes the testing obligation, though. If an exempt fabric turns out to be dangerously flammable in practice, the manufacturer remains liable under the Act.

The Three Flammability Classes

Every tested fabric receives a class based on its burn time. The class determines whether the fabric can legally go into apparel.

Class 1: Normal Flammability

Class 1 fabrics burn slowly enough for clothing use. For plain-surface textiles, that means a burn time of 3.5 seconds or more during the standardized test. Most retail clothing sits here.²

Class 2: Intermediate Flammability

Class 2 only applies to raised-fiber surfaces such as fleece, velvet, or brushed cotton. A fabric lands here when it burns in 4 to 7 seconds and the base fabric ignites at points away from where the flame was first applied, as a result of the surface flash spreading. Class 2 fabrics are still legal for apparel, but the risk profile is measurably higher than Class 1.²

Class 3: Dangerously Flammable

Class 3 fabrics burn too fast for the wearer to react safely and are banned from clothing outright. Selling any garment made from Class 3 fabric violates the Flammable Fabrics Act and exposes the seller to seizure, civil penalties, and criminal prosecution.²

How the Test Works

Five specimens are cut from each fabric, 2 inches by 6 inches, oriented in the direction of fastest burn, with the most flammable surface facing up. Before burning, the specimens go through a standardized laundering and dry-cleaning cycle. The point of that step is to make sure any flame-retardant finish would still be present after real-world use. A treatment that washes out after a few cycles is worthless.⁶

The cleaned specimen is oven-dried, cooled in a desiccator to remove all moisture, then held at a 45-degree angle inside a draft-proof cabinet. A 16-millimeter butane flame is applied to the surface for exactly one second, and an automatic timer records how long the flame takes to travel the length of the sample.⁷ For raised-fiber fabrics, observers also watch whether the base fabric ignites from the surface flash or whether the flash burns off without setting the underlying material alight. That distinction is what separates a Class 1 raised-fiber fabric from a Class 2.

Issuing a General Certificate of Conformity

Every domestic manufacturer and importer of non-exempt clothing textiles must issue a General Certificate of Conformity. The certificate has no fixed format, but it must include seven elements:⁸

A product description detailed enough to match the certificate to the covered product and no others.
The safety rule the product is certified against (16 CFR Part 1610), or a citation to any testing exemption relied on.
The certifying company’s name, mailing address, and phone number.
The name, address, email, and phone number of the person maintaining the underlying test records.
The date and place of manufacture, at minimum month and year plus city, state where applicable, and country of final assembly.
The date and place of the supporting tests.
The name, address, and phone number of any third-party lab that ran the tests. This field can read “N/A” when testing was done in-house, since third-party labs are not required for general adult apparel.

The certificate must rest on either a passing test result for the product or a reasonable testing program.⁹ The importer or domestic manufacturer signs the certificate even when the actual testing happened at an overseas mill.

Records You Have to Keep

Test records and guaranty documentation must be preserved for at least three years from the date of the test. For continuing guaranties, the three years run from the date the guaranty was furnished.¹⁰ CPSC investigators can request these records at any time. A company that cannot produce them is in a very weak position, because missing documentation tends to be read as evidence of non-compliance rather than filing failure.

Guaranties From Suppliers

Retailers and distributors rarely run the flammability tests themselves. The Act addresses that with a guaranty system: a supplier can issue a written guaranty stating the fabric or garment meets the applicable standard, and a downstream buyer who receives that guaranty in good faith is shielded from criminal prosecution under the Act if the product later fails.¹¹

For a guaranty to work as a defense, the issuing company must be based in the United States and must keep the supporting test records domestically. The guaranty has to be based on reasonable and representative testing under the applicable standard, or on another guaranty the issuer received and relied on in good faith. Issuing a guaranty is optional. Retailers who accept inventory without one are absorbing the compliance risk themselves.

Reporting a Problem to the CPSC

When a manufacturer, importer, distributor, or retailer learns that a product may present a substantial hazard or may fail a CPSC safety rule, it must report to the Commission within 24 hours. If the facts are ambiguous, the CPSC allows a reasonable period to investigate, presuming that 10 working days is enough. After that window, the agency treats the company as having whatever information a diligent investigation would have produced.¹² The agency encourages reporting while the internal investigation is still open. Waiting until you are certain is a common and costly error, because delayed reporting becomes its own violation.

Penalties

Consequences run on two tracks. Civil penalties under the Consumer Product Safety Act reach up to $100,000 per knowing violation, with a cap of $15,000,000 for any related series of violations. These maximums are adjusted for inflation every five years.¹³ Each non-compliant unit can count as its own violation, so the totals climb quickly on a full production run.

Criminal penalties under the Flammable Fabrics Act are smaller in dollars but carry a criminal record. A willful violation is a misdemeanor punishable by up to $5,000 in fines, up to one year of imprisonment, or both.¹⁴ The CPSC can also seize non-compliant goods and order mandatory recalls, and those enforcement costs typically exceed any penalty a company pays.

1
U.S. Consumer Product Safety Commission. Flammable Fabrics Act
2
eCFR. 16 CFR Part 1610 – Standard for the Flammability of Clothing Textiles
3
eCFR. 16 CFR Part 1615 – Standard for the Flammability of Childrens Sleepwear Sizes 0 Through 6X
4
U.S. Consumer Product Safety Commission. Flammable Fabrics Act
5
eCFR. 16 CFR 1610.1 – Purpose, Scope and Applicability
6
U.S. Consumer Product Safety Commission. Laboratory Test Manual for 16 CFR Part 1610
7
eCFR. 16 CFR 1610.5 – Test Apparatus and Materials
8
U.S. Consumer Product Safety Commission. General Certificate of Conformity
9
U.S. Consumer Product Safety Commission. General Certificate of Conformity FAQ
10
eCFR. 16 CFR 1610.38 – Maintenance of Records by Those Furnishing Guaranties
11
U.S. Consumer Product Safety Commission. FAQ for Continuing Guaranties Under the Flammable Fabrics Act
12
U.S. Consumer Product Safety Commission. Duty to Report to CPSC
13
Office of the Law Revision Counsel. 15 USC 2069 – Civil Penalties
14
eCFR. 16 CFR Part 1609 – Text of the Flammable Fabrics Act