Low Magnesium Calcium Oxide Powder with Good Price for Rubber Industry

Overview

Low Magnesium Calcium Oxide Powder (CAS: 1305-78-8) is a specialized grade of calcium oxide engineered for the rubber industry, featuring a magnesium oxide (MgO) content ≤1.0% to meet the stringent requirements of rubber compounding. With a purity of ≥92% and a median particle size of 80–120μm, this off-white powder offers excellent dispersion in rubber matrices, enhancing vulcanization efficiency and product durability. The low MgO formula minimizes adverse reactions with sulfur curing agents, making it ideal for producing high-performance rubber 制品 (products) such as tires, seals, and gaskets.

Features

Rubber-Specific Formulation:

Low MgO Design: MgO ≤1.0% (vs. standard CaO’s 1.5–3.0%) reduces interference with sulfur cross-linking, preventing delayed vulcanization and improving cure consistency (variation in cure time ±5% vs. ±15% with standard CaO).

High Calcium Purity: CaO ≥92%, ensuring effective activation of accelerators like thiazoles and sulfenamides, which are critical for optimizing rubber mechanical properties (tensile strength +10%, elongation at break +15%).

Superior Dispersion and Reactivity:

Surface Treatment: Optional stearic acid coating (0.5–1.0%) improves wetting in rubber polymers, reducing mixing time by 20% and enhancing filler-rubber interfacial adhesion.

Controlled Reactivity: Moderate slaking rate (hydration time 15–20 minutes at 25°C) prevents premature activation during compounding, allowing longer storage stability of uncured rubber batches.

Cost-Effective Performance:

Good Price Ratio: 10–15% more cost-effective than premium rubber-grade CaO without compromising cure kinetics, making it suitable for large-scale tire manufacturers (50,000+ MT annual usage).

Customizable Packaging: Available in airtight 25kg paper bags or 1MT bulk bags with moisture barriers, ensuring product integrity during long-distance transport (humidity ≤60% RH).

Application

Tire Manufacturing:

Tread Compounds: Activates sulfur vulcanization in styrene-butadiene rubber (SBR) and butadiene rubber (BR), improving abrasion resistance (wear rate -12%) and heat dissipation in passenger car tires.

Inner Liners: Neutralizes acidic byproducts in butyl rubber (IIR) curing, preventing blistering and enhancing air retention (pressure loss -8% over 30 days).

Industrial Rubber Products:

Seals and Gaskets: Optimizes cure speed in nitrile rubber (NBR) for oil-resistant applications, ensuring consistent hardness (Shore A 60–70) and chemical resistance to gasoline and lubricants.

Conveyor Belts: Enhances adhesion between rubber layers and fabric plies in polyvinyl chloride (PVC) belts, reducing delamination risks in mining and logistics applications.

Rubber Recycling:

Devulcanization Aid: Facilitates reprocessing of waste rubber by breaking sulfur cross-links, increasing recycled rubber tensile strength by 20% when used with mechanical devulcanization methods.

Adjuvant in Rubber Additives:

Zinc Oxide Synergy: Works with ZnO to form an active curing complex, reducing ZnO usage by 15–20% while maintaining vulcanizate properties (modulus @ 100% +5%).

Product Production Process