Chemicals for the Rubber & Tyre Industry
Zinc oxide is the single most critical chemical in rubber vulcanisation — the indispensable activator in sulphur curing systems without which consistent mechanical properties cannot be achieved. MITCHEM supplies rubber-grade and tyre-grade zinc oxide, stearic acid as the essential co-activator, calcium and magnesium stearate as processing lubricants, and magnesium carbonate for neoprene rubber systems.
Key Products6+
ZnO Purity97%–99.5%
FunctionActivator, Lubricant, Release
Tyre GradeAvailable
Key Products for Rubber & Tyres
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Zinc Oxide
CAS: 1314-13-2 | HS: 28170010
ZnO | 81.39 g/mol
Activates the sulphur-accelerator system at 3–5 phr by forming reactive zinc-accelerator complexes that initiate and control crosslinking. Without ZnO, cure rate, crosslink density, and mechanical properties are severely compromised.
Stearic Acid
CAS: 57-11-4 | HS: 29159070
C₁₇H₃₅COOH | 284.48 g/mol
Essential co-activator with zinc oxide — forms zinc stearate in situ which is the active vulcanisation catalyst. Typical dosage 1–3 phr; indispensable alongside ZnO in virtually every sulphur-cured compound.
Calcium Stearate
CAS: 1592-23-0 | HS: 29157010
Ca(C₁₇H₃₅COO)₂ | 607.02 g/mol
Internal lubricant in rubber compounding — reduces mill sticking during open-mill mixing and calendar operations, improving processability and reducing equipment build-up.
Zinc Stearate
CAS: 557-05-1 | HS: 29157010
Zn(C₁₇H₃₅COO)₂ | 632.33 g/mol
Mould release agent — dusted on compound surfaces to facilitate clean ejection of moulded automotive seals, O-rings, and tyre components without post-mould contamination.
Magnesium Stearate
CAS: 557-04-0 | HS: 29157010
Mg(C₁₇H₃₅COO)₂ | 591.27 g/mol
Anti-tack dusting agent for uncured rubber sheets — prevents sticking during storage and transport before final vulcanisation, maintaining compound integrity.
Magnesium Carbonate
CAS: 546-93-0 | HS: 28369200
MgCO₃ | 84.31 g/mol
Mild activator and processing aid in neoprene (polychloroprene) rubber — improves cure rate, reduces tack, and acts as a reinforcing filler in specialty rubber formulations for seals and gaskets.
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