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Cluster: Safety, Chemical & Flame Barrier QuestionsID: QST-SAF-025

What is Antimony Trioxide in Mattress Flame Barriers? | Nappedia

Target Query:“what is antimony trioxide in mattress flame barriers”
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Subject: Chemical Toxicology Antimony Trioxide (Sb2O3)
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Specimen: law-label-quarantined-red
Direct Forensic Answer

Query: “what is antimony trioxide in mattress flame barriers”

Chemical Synergist

Direct Answer Summary

Antimony trioxide ($Sb_2O_3$) is an inorganic chemical flame-retardant synergist frequently co-polymerized into modacrylic fibers or applied to cotton batting. When exposed to heat, it reacts with halogenated compounds to form antimony halides that quench gas-phase free radicals in fire flames. Because antimony trioxide is classified as a possible human carcinogen (IARC Group 2B), health-conscious consumers seek out organic wool, thistle, or silica-rayon barriers.

Audited Core Takeaways

  • 1Acts as a catalytic flame retardant synergist in modacrylic textile fibers.
  • 2Classified as a possible human carcinogen (IARC Group 2B) and skin/respiratory irritant.
  • 3Premium brands eliminate antimony in favor of mechanical barriers like wool or silica.
Regulatory Law Label Specimen
Interactive Laboratory View

Forensic Law Label & Material Audit

Inspect the physical law label tag specimen, decode the state Uniform Registry Number (URN), and review certified material percentages under CPSC 16 CFR Part 1633.

Forensic Specimen Archive • Metrology & Legal Audit

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 AUTHORIZED OFFICIAL

SEIZED / QUARANTINED - UNLAWFUL TO SELL OR REMOVE

UNCERTIFIED POLYURETHANE FOAM80%
GLASS FIBER KNIT SLEEVE (FIBERGLASS)20%
Net Filling Weight (Excluding Steel Springs)
Uniform Registry Number (Click to decode)
REG. NO. CA-000000 (CN)

Certification is made by the manufacturer that the materials in this article are described in accordance with law.

Manufacture Date:01/2025
Plant Facility:Port of Long Beach Inspection Depot, CA
Legal Entity:Unregistered Overseas Importer
16 CFR Part 1633 Prototype: FAILED-NON-COMPLIANTInspect →
Physical Tag Dimensions: 3" × 4.5" (Meets IABFLO 2.5" × 3.0" min)
Active Specimen URN Breakdown
REG. NO. CA-000000 (CN)
Issuing State
CA (California)
Registry Sequence
#000000
Plant Location
CN (China)
IABFLO 31-State Reciprocity: The issuing state (CA) 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.
Audited Metrics4 Verified Metrics

Chemical Toxicology Antimony Trioxide (Sb2O3) Forensic Specifications

Physical construction measurements and laboratory ratings evaluated against regulatory, medical, and durability benchmarks.

Specification / MetricMeasured ValueBenchmark / StandardStatus
Chemical FormulaSb2O3 (Antimony Trioxide)Heavy Metal Chemical RetardantWarning
IARC Carcinogen RatingGroup 2B (Possibly Carcinogenic)Preferred Non-CarcinogenicWarning
Action MechanismHalogen Quenching in Gas PhaseChemical SuppressionNeutral
Alternative BarrierPure Wool / Hydrated Silica ViscoseZero Heavy Metal AdditivesPass

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).

Safety Inspection Protocol3 Actionable Steps

Consumer Safety & Chemical Verification Protocol

Step-by-step physical inspection procedure for flame barrier integrity and law label compliance.

Review Law Label Disclosures

Step 1

Inspect filling breakdown for modacrylic fiber or treated cotton batting.

Critical Hazard to Avoid

Avoid mattresses that emit sharp metallic chemical odors when unboxed.

Check OEKO-TEX Certification

Step 2

Verify OEKO-TEX Standard 100 Class 1 certification, which bans antimony exceeding 10 ppm.

Critical Hazard to Avoid

Do not expose treated covers to acidic washing agents that leach antimony.

Opt for Natural Char Barriers

Step 3

Select mattresses utilizing certified organic wool, natural thistle, or hydrated silica.

Critical Hazard to Avoid

Never buy uncertified budget import memory foam mattresses lacking chemical disclosures.

Authoritative Grounding

Primary Source Regulatory & Engineering Citations

2 Verified Sources

Every factual threshold, dimension, safety standard, and warranty policy cited on this page is derived directly from verified government filings, regulatory standards organizations, or official manufacturer technical documentation.

World Health Organization (WHO / IARC)IARC Monograph Vol. 47

IARC Monographs on the Identification of Carcinogenic Hazards to Humans: Antimony Trioxide

monographs.iarc.who.int/View Source
Agency for Toxic Substances and Disease Registry (ATSDR)ATSDR Toxicological Profile

Toxicological Profile for Antimony and Compounds

www.atsdr.cdc.gov/toxprofiles/tp23.pdfView Source
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