Expanded Perlite for Cryogenic Insulation[2]
Overview
Expanded Perlite for Cryogenic Insulation is a processed form of natural perlite ore, expanded at high temperatures to create a lightweight, porous structure. Its unique properties make it ideal for ultra-low temperature applications, where traditional insulation materials fail. The material is chemically inert, non-combustible, and resistant to thermal shock, making it a preferred choice in industries requiring reliable cryogenic insulation. The production process involves heating raw perlite to around 900°C, causing it to expand up to 20 times its original volume. This expansion creates a network of tiny air pockets, which contribute to its exceptional insulating capabilities. The resulting product is then graded and packaged for various industrial uses.
Physical and Chemical Properties
Expanded Perlite for Cryogenic Insulation exhibits a bulk density range of 30-150 kg/m³, significantly lower than most insulation materials. Its thermal conductivity typically ranges between 0.03-0.05 W/m·K at room temperature, decreasing further at cryogenic temperatures. The material is pH neutral (6.5-7.5) and shows excellent resistance to most acids and alkalis, except for strong hydrofluoric acid and concentrated alkali solutions. Structurally, the material consists of closed and open cells, with the closed cells providing the primary insulation properties. The open cells contribute to vapor permeability while maintaining low water absorption when properly treated. These characteristics make it particularly suitable for applications where moisture control and thermal performance are critical.
Main Applications
The primary application of Expanded Perlite for Cryogenic Insulation is in LNG (liquefied natural gas) storage tanks and transportation systems. It forms the insulating layer in double-walled cryogenic containers, preventing heat transfer and maintaining the extremely low temperatures required for LNG storage (-162°C). The material's light weight reduces structural load compared to alternative insulators. Other significant applications include insulation for liquid nitrogen and oxygen storage systems, superconducting magnet installations, and aerospace cryogenic fuel tanks. In industrial refrigeration, it's used to insulate cold storage facilities and food processing plants. The construction industry employs it in specialty applications where both thermal and acoustic insulation are required under extreme temperature conditions.
Safety and Storage
While Expanded Perlite is non-toxic and non-flammable, proper handling procedures should be followed to minimize dust exposure. Prolonged inhalation of perlite dust may cause respiratory irritation, necessitating the use of NIOSH-approved dust masks during bulk handling. Eye protection and gloves are recommended when working with large quantities. Storage conditions significantly impact material performance. Perlite should be kept in dry conditions, as moisture absorption can temporarily reduce its insulating properties until dried. Bulk bags should be stored on pallets in covered areas, protected from rain and high humidity. For long-term storage, sealed containers or moisture-barrier packaging is recommended to maintain optimal performance characteristics.
B2B Procurement Guide
When procuring Expanded Perlite for Cryogenic Insulation, buyers should specify several key parameters: particle size distribution (typically 1-4mm for cryogenic applications), maximum moisture content (usually <1% by weight), and thermal conductivity at relevant temperature ranges. Certification to ASTM C549 or equivalent standards ensures quality consistency. Lead times can vary from 2-8 weeks depending on order size and customization requirements. Bulk shipments by sea container typically offer the best economics for international procurement, with 20-25 metric tons fitting in a standard 40-foot container. Regional suppliers may offer truckload quantities (18-22 tons) with faster delivery. Always request material safety data sheets and independent test reports for verification of specifications.
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