U.S. Consumer Product Safety Commission (CPSC)
Standard for the Flammability of Mattress Sets
16 CFR Part 1633
Casper Mattress Fiberglass Removal & Contamination
Investigation into Casper mattress fire barrier construction, cover removal warnings, and decontamination protocols.
Transitioned to Silica
Direct answer summary
Early iterations of the Casper Original mattress (pre-2021) incorporated an inner flame sock containing continuous glass fibers to satisfy CPSC 16 CFR Part 1633. Casper subsequently eliminated glass fiber from its North American product line, transitioning to an inherently fire-resistant knit barrier composed of silica-infused rayon and modacrylic. Modern Casper mattresses do not shed glass filaments even if outer covers are handled.
Key points
Legacy pre-2021 models utilized a glass-filament protective fire sleeve.
Current Casper mattresses utilize 100% fiberglass-free silica rayon knit barriers.
Unzipping older legacy models still presents a localized fiber shedding hazard.
Interactive example
Explore an example related to this answer.
Verified Law Label
Interactive Visual Tool
Law Label & Material Audit
Inspect the physical law label tag, decode the state Uniform Registry Number (URN), and review certified material percentages under CPSC 16 CFR Part 1633.
What the law tag tells you
Uniform Law Label & Material Deconstruction
Under FTC 16 CFR Part 303 and IABFLO uniform law label standards, bedding manufacturers must disclose exact net filling weights using standardized generic fiber terms. Marketing buzzwords are prohibited under federal penalty.
▲ Sewn Into Seam (Tyvek Substrate) ▲
UNDER PENALTY OF LAW THIS TAG NOT TO BE REMOVED EXCEPT BY THE CONSUMER
ALL NEW MATERIAL CONSISTING OF
POLYURETHANE FOAM PAD55%
RESIN-TREATED COTTON BATTING25%
RAYON FIBER / WOOL CHAR BARRIER20%
Net Filling Weight (Excluding Steel Springs)
Uniform Registry Number (Click to decode)
REG. NO. UT-12345 (FL)
Certification is made by the manufacturer that the materials in this article are described in accordance with law.
Manufacture Date:04/2026
Plant Facility:Tampa, FL
Legal Entity:Saatva Inc. / Bedding Industries of America (BIA)
16 CFR Part 1633 Prototype: STV-115-HYB-2026Inspect →
Physical Tag Dimensions: 2.75" × 3.75" (Meets IABFLO 2.5" × 3.0" min)
What the tag number means
REG. NO. UT-12345 (FL)
Issuing State
UT (Utah)
Registry Sequence
#12345
Plant Location
FL (Florida)
IABFLO 31-State Reciprocity: The issuing state (UT) participates in the Uniform Law Label system. This single registration permits lawful commercial distribution across all 31 regulated US bedding jurisdictions without duplicate state tags.
Specifications
Recorded specifications
Values and benchmarks recorded for this question.
| Specification | Measured value | Benchmark | Status |
|---|---|---|---|
| Current Fire Barrier | Silica Rayon Knit (Fiberglass-Free) | Non-Hazardous Fire Barrier | pass |
| Legacy Fire Barrier | Glass Filament Inner Sleeve | Zero Glass Content | warning |
| Flammability Rating | 16 CFR Part 1633 Certified | Peak HRR < 200 kW | pass |
| Chemical Certifications | CertiPUR-US & OEKO-TEX Standard 100 | Zero Hazardous Emissions | pass |
Standards reference: Benchmarks derived from ASTM D3574 (flexible cellular foam), CPSC 16 CFR 1633 (open flame flammability), and clinical capillary closing thresholds (32.0 mmHg).
Checklist
Consumer Safety & Chemical Verification Protocol
Step-by-step physical inspection procedure for flame barrier integrity and law label compliance.
- 01
Audit Manufacturing Date
Locate the manufacture date on the Tyvek law tag to confirm if built post-2021.
Watch for: Do not assume all Casper units share identical barrier specifications.
- 02
Evaluate Cover Zipper Status
Ensure the perimeter zipper is secured and taped over if legacy unit.
Watch for: Never place the outer mattress cover in a residential clothes dryer.
- 03
Check Airborne Particles
Use an air quality particle counter (PM2.5 / PM10) to verify clean ambient air.
Watch for: Avoid sweeping dry floors near suspected mineral fiber shedding.
Sources
Sources for this answer
Read the source documents behind the thresholds, measurements, and policy details used here.
View source
Agency for Toxic Substances and Disease Registry (ATSDR)
Synthetic Vitreous Fibers Toxicology Profile
ATSDR Toxicological Profile