Overview
Azodicarbonamide (ADCA) is an organic compound primarily used as a blowing agent in the production of foamed plastics and rubber. Its ability to decompose at specific temperatures to release nitrogen gas makes it valuable for creating lightweight, porous materials. First synthesized in the early 20th century, ADCA gained industrial prominence due to its efficiency and cost-effectiveness. While its use in food applications (e.g., flour bleaching) is controversial and restricted in some countries, it remains widely adopted in polymer processing globally.
Physical and Chemical Properties
ADCA appears as a yellow-orange crystalline powder with a density of 1.65 g/cm³. It decomposes at 225-230°C, releasing nitrogen, carbon monoxide, and other gases, which form bubbles in polymer matrices. The compound is insoluble in water but dissolves in polar solvents like dimethyl sulfoxide. Its thermal decomposition is highly predictable, making it suitable for controlled foaming processes. ADCA is stable at room temperature but requires careful storage to prevent premature decomposition from heat or contamination.
Main Applications
In plastics, ADCA is used to produce foamed PVC, polyethylene, and EVA for applications like shoe soles, yoga mats, and insulation materials. The rubber industry employs it for sponge rubber products. As a food additive (E927), it bleaches flour and strengthens dough, though this use is banned in the EU and Australia. Non-food industrial applications dominate global demand, particularly in construction and automotive sectors for lightweight components.
Safety and Storage
ADCA dust may irritate the respiratory system, requiring PPE during handling. It should be stored away from heat sources to prevent accidental decomposition. Regulatory status varies: while approved for food use in some countries (e.g., US, Brazil), it is prohibited in others due to concerns about breakdown byproducts. Industrial users must comply with local occupational exposure limits (typically 0.1-1 mg/m³).
B2B Procurement Guide
When sourcing ADCA, prioritize suppliers with ISO certification and batch-specific COA (Certificate of Analysis). Key specifications include purity (≥98%), decomposition temperature, and gas yield (typically 200-220 mL/g). Bulk pricing varies by quantity and region, with Asian suppliers often offering competitive rates. Verify transportation compliance, as some carriers classify ADCA as a hazardous material. Lead times average 2-4 weeks for international shipments.
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