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Wool Burns

Organics Burn

Many mattresses who claim to be "Organic" say they use wool as the flame barrier. While wool would pass the old cigarette test for mattresses, it will not pass the new open flame test. These mattresses either use chemically treaded wool, another chemical system, or rely on chemically treated cotton batting (Boric Acid and Antimony) to pass the open flame test.

There are no natural, chemical free, or nontoxic systems that pass the severe open flame test. Even what they call "inherently fire resistant" fibers contain chemicals in the fiber itself. There are no labeling requirements for the FR chemicals in mattresses. Thus, most mattress manufacturers deny using chemicals. It is unfortunate that even "Organic" mattress makers often claim to use no chemicals when a prescription mattress would be chemical free.


Wool Burn Test

2 Seconds 6 Seconds 10 Seconds 14 Seconds 18 Seconds 20 Seconds - Gone

Test performed with commercially available wool, you can repeat this test at home:

Lion Brand Wool


Relative summary of the flammability properties of fibers:
Fiber Heat of Combustion
Ignition Temperature
Cotton 3.9 255
Rayon 3.9 420
Nylon 7.9 575
Polyester 5.7 560
Wool 4.9 600
Zipro Wool (Treated with Zirconium, a heavy metal)  -  -

Source: Commonwealth Scientific and Industrial Research Organization (CSIRO) (Australia)


A Propane torch like used in the mattress open flame test has a temperature of 1,980 (°C) or 3,596 (°F)

You can see in the table above that wool or any untreated fiber including cotton, rayon, nylon, or polyester will not pass the open flame test for mattresses. The flame temperature is more than three times that required for ignition. Plus you can see proof in the burn photos above or with your own test.

There are two ways, and only two ways, to make a fiber fire resistant: 1) Coat the fiber with FR chemicals, 2) Manufacture the fiber with FR chemicals incorporated into the fiber itself. These are called "inherently fire restraint" fibers.

The US Consumer Products Safety Commission (CPSC) did not want the public to know the FR chemicals contained in mattresses (they are all scary), so there are no labeling requirements.

Mattress manufacturers do not want to admit using chemicals so they say "we use a natural system" or "we use wool" or "we use 'inherently fire resistant' fibers." Again, 'inherently fire resistant" fibers contain chemicals, such as Antimony in the fiber itself in Modacrylic fibers.

Another popular inherent system they try to call 'Rayon' contains Silica Glass (a respiratory hazard) and other chemicals such as Phosphates or Antimony. You can see untreated Rayon burns in the table above (Also See CPSC Table of Chemicals in Mattresses)

Some fireproofing systems spray or apply chemicals. The CPSC says there are some chemical free systems, meaning the inherent systems. This double talk is very misleading because even the inherent systems have toxic and cancer causing chemicals in the fiber itself. The CPSC proved Antimony leaches out of these fibers and says we will absorb .8 mg Antimony every night from mattresses, this is 27 times more than the EPA says is safe. (See Mattresses Toxic by 27X)


From a Patent on making wool and natural fibers flameproof:

"The present invention concerns methods of inhibiting the burning of natural fibers (e.g., wool, wool fibers, animal hair, cotton), synthetic fibers (e.g., acetate, nylon, polyester, viscose rayon), or blends thereof (e.g., wool/cotton blends), or fabrics or yarns composed of natural fibers, synthetic fibers, or blends thereof, involving treating the fibers (or fabrics or yarns) with polyamic acid or at least one polyimidesiloxane or mixtures of polyamic acid and at least one polyimidesiloxane."

"Conventional chemical treatments to confer flame resistance to wool include treatment with the flame retarding agents applied to cotton, such as salts of borate, phosphate, metals, and tetrakishydroxymethyl phosphonium, and titanium compounds. Zirconium complexes under the trademark Zirpro™, issued by the International Wool Secretariat, are one of the successful flame retardants for wool. Many modifications of the Zirpro™ process according to specific needs have been made. For example, tetrabromophthalic acid (TBPA) is used along with Zirpro™ to obtain low heat release wool. However, zirconium salts have the environmental disadvantage of zirconium being a heavy metal."


From "Commonwealth Scientific and Industrial Research Organization (CSIRO):"

"The evolution of increasingly severe mandatory flammability regulations in many aspects of domestic, social and business life has meant that even inherently low flammability fibres, such as wool, require a flame retardant treatment for some applications. Typical applications subject to mandatory flammability requirements include children's nightwear, domestic and commercial furnishings, public transportation and protective clothing. … "

"The flame resistance of all textiles, including wool products, can be improved by selected chemical treatments. Initially, fire retardant treatments for wool were based on the impregnation of borates, phosphates and to a limited degree the organic phosphorus compounds more commonly associated with cellulosic fibres. The introduction of stricter flammability requirements for airline furnishings resulted from a review of general aviation standards coinciding with the release of wide bodied aircraft in the early 1970's. Many flammability treatments available at the time did not satisfy the new requirements, so The International Wool Secretariat developed a new flame retardant treatment based on the reaction of zirconium or titanium salts with wool. A suite of treatments, based on these two actives, was eventually developed under the generic title of “Zirpro”, to cover a variety of flammability standards and care claims."



There are no natural, chemical free, or nontoxic mattresses that comply with the federal regulation. They all contain toxic chemicals. Your only choice for a chemical free mattress is by prescription.