Overview
Special expanded perlite is a processed form of natural perlite ore, heated to 900-1,100°C to create a lightweight, porous structure. Unlike standard perlite, it undergoes controlled expansion for specific industrial requirements, achieving precise density and particle size distribution. The material is chemically inert, non-combustible, and compatible with most construction and agricultural applications. First commercialized in the 1940s, modern production techniques now yield tailored grades for niche uses like high-temperature filtration or hydroponic systems. Its sustainability—derived from abundant volcanic deposits—makes it a preferred alternative to synthetic insulation materials in green building projects.
Physical and Chemical Properties
The material’s low density (30-150 kg/m³) stems from its vesicular structure, with trapped air pockets accounting for over 90% of its volume. These pores provide exceptional thermal conductivity of 0.04-0.06 W/m·K, comparable to mineral wool. Its aluminosilicate composition ensures stability up to 1,000°C, with no emission of toxic fumes when exposed to fire. Chemically, expanded perlite is pH-neutral (6.5-7.5) and contains no crystalline silica, eliminating health risks associated with silicosis. The surface area can reach 2-4 m²/g, enhancing its utility as a filtration medium or catalyst carrier in chemical processes.
Main Applications
In construction, perlite dominates as loose-fill insulation for masonry cavities and lightweight aggregate in plasters/cements. Its fire resistance (Class A rating) makes it essential for passive fire protection systems. Recent innovations include perlite-enhanced gypsum boards that reduce building weight by 30%. Horticultural applications leverage its water retention (3-4 times its weight) and aeration properties, particularly in soilless mixes for greenhouse cultivation. Industrial uses range from cryogenic insulation for LNG tanks to abrasive additives in cleansers. Emerging markets include 3D-printed construction materials and battery thermal management systems.
Safety and Storage
While non-hazardous under GHS classification, perlite dust can cause mechanical irritation. OSHA recommends a P1 respirator for prolonged exposure to airborne particles above 10 mg/m³. Storage requires protection from humidity—bulk bags should be palletized and covered to prevent compaction from moisture absorption. Transport regulations classify it as a non-flammable solid (UN 2212). Spills pose minimal environmental risk but should be cleaned promptly to prevent slip hazards. Suppliers typically provide Material Safety Data Sheets (MSDS) confirming heavy metal content below 0.1% for food-contact applications.
B2B Procurement Guide
Key specifications include expansion ratio (commonly 10:1 to 20:1), bulk density (specify ‘as poured’ or ‘compacted’), and particle size distribution (0.1-6 mm for most uses). Construction-grade perlite often requires ASTM C549 certification, while horticultural grades may need OMRI listing for organic farming. Leading producers in China (e.g., Henan and Shandong provinces) offer FOB prices around $80/ton for standard grades, with MOQs of 20 tons for export contracts. Buyers should verify chloride content (<0.1%) for corrosion-sensitive applications and request batch-specific thermal conductivity test reports for insulation projects.
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