Perlite Lightweight Castable

Perlite Insulating Castable

Material System & Positioning

Perlite insulating castable uses expanded perlite aggregate with bulk density only 0.60 g/cm³, thermal conductivity ≤0.20 W/(m·K) at 500℃ and service up to 900℃. Extremely light and economical with simple on-site casting, it is Henan Songrui's cost-effective grade for boiler back-end ducts, pipes and equipment shell insulation.

Key Performance

• Extremely light: 0.60 g/cm³, negligible load on equipment.
• Low thermal conductivity: effective insulation.
• Economical: low cost for large low-temperature insulation.
• Easy installation: monolithic casting adapts to complex surfaces.
• Limited temperature: max 900℃, never in direct flame or slag contact.

Applications

• Power Boilers: back-end flue ducts, economizer zone insulation, fan casing insulation.
• Industrial Piping: hot gas and flue ducting, equipment shell insulation.
• Chemical: tank and reactor shell insulation.
• General: low-temperature equipment insulation.

Selection Advice

Perlite grade suits insulation below 900℃ only, never flame contact. For higher temperatures choose ceramsite, lightweight high-alumina or mullite grades for safety.

Installation & Maintenance

Mix and pour gently to avoid perlite aggregate breakage; heat up slowly per the low-temperature curve.

Quality Assurance

Henan Songrui New Refractory Materials Co., Ltd. (Xuanhua Town Industrial Park, Henan) is a 2024 Class A taxpayer and SRDI SME. For selection, quotation or installation guidance, contact Manager Zheng (17513376789 / 17513376789@163.com).

• Expanded perlite aggregate, low density and economical
• Low conductivity for large-area low-temperature insulation
• Simple cast-in-place installation
• For boiler back-end flues, ducts and outer-shell insulation
• Lower cost than dense or lightweight high-alumina grades
• Limited service temperature; never direct flame contact

Perlite lightweight castable uses expanded perlite, ultra-light:

• Power Boilers: boiler walls, ducts, ESP insulation.
• Petrochemical: heater wall insulation, tank and hot pipe insulation.
• Steel & Iron: hot blast stove shell insulation, chimney linings.
• General: insulation of medium-low temperature furnaces and equipment.
• Advantage: very low density (≤0.6 g/cm³), extremely low thermal conductivity, service up to 1000℃.