Molybdenum Trioxide (MoO3) Smoke Suppressant

Name: Molybdenum Trioxide (MoO3) Smoke Suppressant
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 1313-27-5

Molybdenum trioxide (MoO3) is an inorganic smoke suppressant and flame retardant synergist used primarily in PVC and halogen-containing polymer formulations where reduction of toxic smoke and corrosive gas emissions is critical. It functions by catalyzing cross-linking reactions in the polymer char, retaining carbon in the condensed phase rather than releasing it as smoke particles. MoO3 is a high-performance alternative to zinc stannate in demanding smoke-critical applications such as offshore cables, naval vessels, and underground transit systems.

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Technical Specifications

appearance	White to pale yellow powder
moisture (%)	<0.3
MoO3 content (%)	≥99
particle size D50 (µm)	1–10
specific surface area (m²/g)	1–5
decomposition temperature (°C)	795 (sublimation)

Applications

Offshore and marine low-smoke zero-halogen (LSZH) cable formulations
Underground transit and subway system cable and wiring harnesses
Naval and military halogen-containing cable with reduced smoke toxicity
High-performance PVC automotive interior materials with low fogging requirements
Smoke-critical building and infrastructure halogenated polymer components

Key Features

Superior smoke suppression in PVC: catalyzes carbonaceous char formation, significantly reducing NBS smoke density
High thermal stability (sublimation at 795 °C) prevents loss during polymer compound processing
Complements ATH and zinc borate in formulations targeting multiple fire test criteria simultaneously
Low loading levels (1–5 phr) sufficient for meaningful smoke reduction with minimal impact on other properties