Product Introduction

Perlite cenospheres are white-gray hollow glassy spheres that appear smooth, thin-walled, and semi-transparent under a microscope. With low density and high thermal resistance (≥1610°C), they are widely used in lightweight refractory castables and oil drilling operations. The growing environmental concerns have led to rising prices for traditional fly ash cenospheres, making artificial cenospheres a cost-effective alternative for optimizing construction processes and reducing costs. These hollow particles, primarily composed of silica (SiO2) and alumina (Al2O3), offer various advantages such as being lightweight, high-strength, insulating, and resistant to heat and wear.

Product Features

• High Refractoriness: Perlite cenospheres have a refractoriness between 1600-1700°C, owing to their high SiO2 (50-65%) and Al2O3 (25-35%) content.
• Lightweight & Insulating: Their thin-walled, hollow structure with a semi-vacuum core gives them excellent insulating properties, with a bulk density of 250-450 kg/m³ and a thermal conductivity of 0.08-0.1 W/m·K.
• High Strength & Hardness: Formed from hard glassy minerals (quartz and mullite), cenospheres have a hardness of 6-7 Mohs and a compressive strength of 70-140 MPa.
• Electrical Insulation: Unlike most materials, their electrical resistance increases with rising temperatures, making them excellent for insulating applications.
• Fine Particle Size: Naturally occurring with particle sizes between 1-250 microns and a surface area of 300-360 g/cm², they are readily usable without additional grinding.

Specification

Chemical Composition of Perlite Microspheres

Physical Properties of Perlite Microspheres

Application

• Plastic Industry: Used as a filler material to enhance product properties.
• Refractory Materials: For manufacturing lightweight fireproof materials.
• Insulating Materials: Excellent for producing cost-effective insulation products.
• Waterproof Coatings: Incorporated into waterproofing paints.
• Oil Well Cementing: Improves sealing and plugging in well cementing.
• Metallurgy: Used in casting and welding workshop partitions as filler material.
• Soundproofing: Mixed with ethylene-based plastics to produce noise-reducing materials.
• Brake Pads: Cenospheres’ high strength and wear resistance make them suitable for automotive and oil rig brake pads.