At a glance
| Chemical family | Chlorinated alkene (PVC monomer) |
| CAS number | 75-01-4 |
| Classification | IARC Group 1 — carcinogenic to humans (hepatic angiosarcoma) |
| Where you encounter it | Residual monomer in PVC (polyvinyl chloride) products — vinyl mattress covers, waterproof protectors, vinyl flooring, shower curtains |
| Sleep micro-environment relevance | Off-gassing from vinyl mattress covers and waterproof protectors; vinyl flooring emissions |
Regulatory & certification status
Where vinyl chloride stands across the major regulatory systems and the certifications a bedroom product might carry.
| EU REACH | Residual VCM in finished PVC articles restricted to <1 mg/kg (1 ppm) under Annex XVII. Regulatory |
| US EPA | National Emission Standard for vinyl chloride (40 CFR Part 61, Subpart F); listed under California Proposition 65 as a carcinogen. Regulatory |
| California Prop 65 | Listed as a carcinogen (known to cause cancer). Regulatory |
| OEKO-TEX STD 100 | PVC and vinyl chloride restricted in certified products. Industry |
What it is
Vinyl chloride (chloroethene, CH₂=CHCl) is a colourless gas at room temperature with a faintly sweet odour. It is produced on a massive industrial scale as the monomer for polyvinyl chloride — one of the world's most widely used plastics. PVC appears in bedroom products as vinyl mattress covers, waterproof protectors, flooring, and window blinds.
IARC classifies vinyl chloride as a Group 1 carcinogen — carcinogenic to humans — based on sufficient evidence linking occupational exposure to hepatic angiosarcoma, a rare and aggressive liver cancer. Peer-reviewed — IARC Monographs Vol. 100F The classification reflects decades of epidemiological evidence from workers in PVC production facilities.
How it relates to the bedroom
Residual monomer in PVC products
When PVC is manufactured, not every vinyl chloride molecule is incorporated into the polymer chain. The unreacted portion — residual monomer — remains trapped in the finished plastic and can migrate to the surface and off-gas into indoor air. Vinyl mattress covers, waterproof mattress protectors, and vinyl flooring are all potential sources. The off-gassing rate is highest when the product is new and declines over time as the residual monomer is depleted.
Why the residual matters
Modern manufacturing has reduced residual VCM levels dramatically compared to the 1970s, when the occupational cancer link was established. The EU REACH restriction limits residual VCM in finished articles to less than 1 mg/kg (1 ppm). Regulatory — EU REACH Annex XVII But vinyl chloride's extreme carcinogenic potency means regulators treat any exposure as undesirable. There is no recognised safe threshold for a Group 1 carcinogen — the objective is to minimise exposure, not to define an acceptable level.
The bedroom context
A vinyl mattress cover sits directly beneath the sleeper for hours each night in a poorly ventilated breathing zone. Even at sub-ppm residual levels, the proximity and duration of exposure distinguish the bedroom from other indoor settings. This is compounded when vinyl flooring is also present — the room then has multiple PVC sources contributing to the same airspace. Inferred — exposure scales with source proximity and ventilation
What the research says
- Group 1 carcinogen. Sufficient evidence in humans for hepatic angiosarcoma; limited evidence for hepatocellular carcinoma. Peer-reviewed — IARC 2012
- Residual monomer off-gassing is real. VCM migrates from PVC products, especially when new. Regulatory — EU REACH restriction basis
- No safe threshold recognised. Regulatory approach is to minimise exposure rather than define an acceptable concentration. Inferred
What helps reduce it
Choose non-PVC alternatives. Thermoplastic polyurethane (TPU) laminate protectors and polyurethane-backed fabric covers provide waterproofing without vinyl chloride monomer risk.
Air out new vinyl products. If you do use a vinyl mattress cover or protector, unwrap it and air it in a well-ventilated space for several days before sleeping on it. The highest off-gassing occurs in the first days after unpacking.
Ventilate the bedroom. Fresh-air exchange dilutes any residual VCM that does off-gas, reducing the concentration in the breathing zone.
What does NOT help
- Activated carbon filtration alone. Vinyl chloride is a small, highly volatile gas (boiling point −13 °C) that is poorly captured by standard carbon filters at room temperature.
- Assuming age eliminates risk. While off-gassing decreases over time, very old vinyl products may also degrade and release plasticiser breakdown products — a different but related concern.
Citations
- IARC (2012). Vinyl chloride — Group 1 carcinogen. IARC Monographs Vol. 100F. Peer-reviewed
- EU REACH Regulation — Annex XVII restrictions on vinyl chloride monomer in finished articles. Regulatory
Frequently asked questions
Does my vinyl mattress cover release vinyl chloride?
It can. Residual vinyl chloride monomer — VCM that was not fully polymerised during PVC production — can off-gas from vinyl products, especially when new. Modern production keeps residual VCM well below 1 ppm, and EU REACH enforces that limit. The off-gassing rate drops over time, but IARC's Group 1 classification reflects the fact that there is no recognised safe threshold for a known human carcinogen.
Are there alternatives to vinyl mattress protectors?
Yes. Thermoplastic polyurethane (TPU) laminate and polyurethane-backed fabric protectors provide waterproofing without PVC. These alternatives avoid the vinyl chloride monomer issue entirely. If you are using a vinyl protector, good ventilation and airing the product before use reduces initial off-gassing.
Related compounds
Embr is a sleep environment company researching and addressing the chemistry of the bedroom. Research and product development in progress.
Last reviewed 2026-07-07. If you find a factual error, contact us.