Overview
Modified vermiculite is produced by heat-treating natural vermiculite ore, causing it to expand into lightweight, accordion-like flakes. This process enhances its insulating and absorbent properties, making it valuable across industries. The modification typically involves heating raw vermiculite to 900°C, which releases interlayer water and increases volume 8-30 times. Unlike unprocessed vermiculite, the modified version exhibits superior thermal stability and reduced density, enabling specialized uses in high-temperature environments.
Physical and Chemical Properties
Modified vermiculite’s layered silicate structure provides exceptional thermal insulation (conductivity: 0.04–0.06 W/m·K) and fire resistance (withstands up to 1,100°C). Its porous texture offers high surface area for moisture and chemical absorption. Chemically inert and pH-neutral (7–8), it resists decomposition and microbial growth. The material retains natural cation exchange capacity (CEC), beneficial for agricultural applications. Its bulk density ranges from 65–130 kg/m³ post-expansion, depending on processing parameters.
Main Applications
In construction, modified vermiculite is used as loose-fill insulation, lightweight concrete aggregate, and fireproofing spray component. It meets ASTM C516 standards for building materials. Horticulture leverages its water retention (up to 200% by weight) and aeration properties for soil amendments and hydroponic substrates. Industrial uses include hazardous spill absorbents, brake linings, and packaging materials. Recent innovations include eco-friendly paint additives and battery thermal barriers.
Safety and Storage
Though non-hazardous, prolonged dust inhalation may cause respiratory irritation. NIOSH recommends P2 respirators during bulk handling. Storage requires dry conditions to prevent compaction; moisture reduces expansion efficiency. Modified vermiculite is asbestos-free, but buyers should request mill test reports to confirm compliance with OSHA and REACH regulations. Bulk shipments are typically palletized and shrink-wrapped to prevent moisture ingress during transit.
B2B Procurement Guide
Key specifications include expansion ratio (8:1 to 30:1), particle size (0.5–8 mm grades), and bulk density. Construction buyers prioritize fire ratings (ASTM E136), while agricultural users focus on CEC (10–100 meq/100g). Leading producers are in South Africa, China, and Brazil. MOQs for industrial grades start at 20-ton containers, with pricing tiers for 100+ ton orders. Sample testing is advised to verify compatibility with end-use processes like coating or mixing.
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