U.S. Consumer Product Safety Commission (CPSC)
Standard for the Flammability of Mattress Sets
16 CFR Part 1633
Natural Thistle Flame Barrier: How Does It Work?
Deconstructs Saatva's natural thistle pulp flame barrier, plant lignin chemistry, and thermal charring mechanics.
Plant-Based Thermal Char
Direct answer summary
Saatva's natural thistle flame barrier is engineered from wood pulp cellulose derived from natural thistle plants blended with polyester fibers. When exposed to an open flame under CPSC 16 CFR Part 1633, the thistle fibers undergo endothermic decomposition: moisture is released, and the high-lignin plant cellulose forms a dense, non-combustible carbon char layer that blocks oxygen from reaching underlying mattress layers.
Key points
Formulated from natural thistle plant wood pulp cellulose bonded with polyester.
Operates through endothermic carbon charring rather than chemical vapor suppression.
Completely eliminates fiberglass, synthetic glass shards, and toxic flame retardants.
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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 |
|---|---|---|---|
| Plant Fiber Origin | Natural Thistle Pulp (Wood Cellulose) | Renewable Agricultural Origin | pass |
| Thermal Char Mechanism | Intumescent Carbon Shield Formation | Oxygen-Starvation Barrier | pass |
| Fiberglass Content | 0% (Completely Fiberglass-Free) | Zero Mineral Fibers | pass |
| CPSC 16 CFR 1633 Result | Peak HRR < 140 kW in 30-min Burn | Statutory Pass Standard (<200 kW) | 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
Examine Saatva Law Tag
Confirm the filling materials declare cellulosic plant fiber and polyester.
Watch for: Do not detach the statutory white label from the bottom tape edge.
- 02
Inspect Euro-Top Ticking
Observe the soft organic cotton cover quilted directly over the thistle barrier.
Watch for: Never use harsh bleach or industrial oxidizers on organic cotton covers.
- 03
Verify Non-Toxic Pedigree
Check Saatva official disclosures confirming zero antimony or chemical spray treatments.
Watch for: Never confuse thistle cellulose barriers with synthetic modacrylic flame socks.
Sources
Sources for this answer
Read the source documents behind the thresholds, measurements, and policy details used here.
View source
Federal Trade Commission (FTC)
Textile Fiber Products Identification Act
16 CFR Part 303