Fiberglass in Mattresses: How to Check and What to Do

Some mattresses use glass fiber inside the cover as a fire barrier. It is spelled fiberglass in the United States, and on a label it may appear as “glass fiber”. The concern raised by a state health department, and in two lawsuits, is what happens when the fibers get out, most obviously when a cover is opened or damaged.

This article sets out what the public record shows, how to check a mattress without opening it, and what the official advice is if fibers have escaped. It is about mattresses. Toppers and pads fall outside the federal fire standard involved; our mattress topper buying guide covers what to check on those.

Why it is there

Mattresses sold in the United States have to pass a federal open-flame test, set out in a standard published in 2006 (16 CFR Part 1633). A mattress is exposed to gas burners and must keep the resulting fire small for thirty minutes: the peak rate of heat release may not exceed 200 kilowatts, and the total heat released in the first ten minutes may not exceed 15 megajoules. The rule’s stated purpose is to reduce deaths and injuries from mattress fires.

The standard sets a result, and manufacturers choose how to reach it. One method is a fire-barrier fabric wrapped around the foam, sometimes called a sock. California’s Department of Public Health (CDPH) says some manufacturers use fiberglass for this in place of chemical flame retardants.

What this does not tell you

The California study is the most detailed public evidence we found, and it is small. It covered four mattresses bought in spring 2021. It does not show how common glass-fiber barriers are, whether the same models are made the same way today, or how much fiber escapes in ordinary use. Manufacturers change materials, so a result from 2021 is not a statement about a mattress on sale now.

We also did not find a CPSC recall issued because of glass fiber in a mattress cover. The official sources we read describe complaints and a state investigation. We were not able to search the CPSC recall database ourselves while preparing this article, so check it for your own brand and model: our guide to checking whether a product has been recalled shows how.

The lawsuits

Two federal lawsuits have made claims about glass fiber in Zinus mattresses. What follows is taken from the court dockets. Claims in a lawsuit are allegations, not findings.

• Chandler v. Amazon.com LLC (Southern District of Illinois, No. 3:20-cv-00265) was filed on March 12, 2020, with Zinus among the defendants. In July 2024 the court recorded the parties’ report that mediation had produced an agreement in principle to settle that case, a case in another court and other claims. The docket lists a judgment entered on April 28, 2026. The terms are not set out in the docket entries we were able to read.
• Gutierrez v. Zinus, Inc. (Eastern District of California, No. 2:22-cv-01172) was filed on July 7, 2022, as a proposed class action. The complaint alleges that glass fibers from the fire-retardant sleeve can break and escape through the outer cover, that the cover has a zip and inadequate warnings, and that this caused skin and eye irritation, breathing problems and property damage. The docket shows the case was closed on August 28, 2023.

Zinus moved to dismiss the California case, and a partial motion to dismiss was filed in the Illinois case. We have not seen a court ruling on whether the allegations were true, and we could not reach the company’s website to quote its current position. We cannot tell you whether you have a claim; that is a question for a lawyer.

How to check a mattress without opening it

1. Read every label and tag. CDPH says glass fiber may be listed as “glass fiber”. The National Capital Poison Center adds “fiberglass” and “glass wool” as terms to look for.
2. Do not treat a clean label as proof. CDPH warns that some labels do not list it even when it is inside, and says plainly that you cannot know for certain.
3. Do not rely on a foam certification. CertiPUR-US says its certified foam should not contain fiberglass, and also that some mattress makers surround the foam with fiberglass barrier fabrics. The mark is about the foam, not the cover. Our guide to mattress topper smell explains what that label does measure.
4. Ask the manufacturer in writing what the fire barrier is made of, and keep the reply.
5. Search the complaints database. CDPH suggests searching SaferProducts.gov for “mattress and fiberglass”. Remember that these are unverified reports.

If you own a mattress that may contain it

• Keep the outer cover on and closed. CDPH’s advice is never to unzip a mattress cover. CertiPUR-US notes that zips on mattresses are generally there for factory assembly, and says not to open a cover unless it is meant to be removed and you have checked with the manufacturer.
• Do not wash the cover unless the manufacturer’s instructions clearly say it is removable and washable.
• Check it for damage from time to time. CDPH says that if a tear in the cover cannot be repaired, the mattress should be disposed of.

If fibers have escaped

CDPH describes glass fibers as stiff and easily broken into pieces small enough to settle as dust. Contact can irritate the skin and eyes, and breathing them in can irritate the nose, throat and lungs. Its factsheet gives these steps:

1. Protect yourself first. Wear safety goggles, a mask over your nose and mouth, and loose clothing that covers your skin.
2. Cover the mattress, then remove it. Wrapping it first limits how far the fibers spread. CDPH expects that it will need to be thrown away.
3. Vacuum with a HEPA filter. Do not sweep. Sweeping pushes fibers into the air. Then wipe every surface with a damp cloth.
4. Wash bedding and clothes separately from other laundry, ideally one item at a time, and rinse the machine after each wash. Throw away anything the fibers will not come out of.
5. Check at night with a torch (flashlight). Glass fibers can shimmer in the beam and show you what you missed.
6. Report it to the CPSC at SaferProducts.gov.

If anyone has symptoms after exposure, the National Capital Poison Center’s helpline in the US is 1-800-222-1222, and persistent skin, eye or breathing problems should be seen by a doctor.

If you are buying a mattress now

California has legislated. Assembly Bill 1059, signed in October 2023, prohibits the manufacture and sale in California, from January 1, 2027, of new mattresses, juvenile products and upholstered furniture containing textile fiberglass. Two details are worth knowing. The law applies in California only. And its definition of textile fiberglass leaves out yarns in which the glass filaments are corespun or sheathed by another fiber, so it does not rule out every use of glass in a fire barrier.

Wherever you live, the practical checks are the same: read the label before you buy, ask the seller what the fire barrier is made of, and prefer a seller that answers clearly. The Sleep Foundation names wool and silica-treated rayon among the alternative fire-barrier materials.

What about toppers and pads?

The open-flame standard that leads mattress makers to add fire barriers defines a mattress in a way that excludes mattress pads and mattress toppers. That removes the usual reason for a glass-fiber layer, but it is not proof that no topper contains one, and we found no official testing of toppers. The same habits apply: read the label, and do not cut or unpick a sewn cover to look inside.

How we researched this

This article is based on the California Department of Public Health’s factsheet and investigation summary, its scientists’ peer-reviewed study, the text of the federal flammability standard and of California’s AB 1059, two federal court dockets, a CertiPUR-US statement and poison-center guidance. We did not test any mattress. We name a brand only where an official source or a court record does.