Biltech Building Elements Ltd. makes AAC blocks from fine fly ash with lime, gypsum and cement as binders, water and aluminium powder as foaming agent. The mixture is poured into moulds, allowed to rise and set, cut to shape and steam cured in autoclaves for about 10-12 hours at 190 deg C under 12 bar saturated steam pressure. Block sizes vary by plant (Tumkur, Bhigwan, Kolkata, Surat, Palghar).

Key features

• Oven-dry density 451-550 and 551-650 kg/m3
• Average thermal conductivity 0.16 W/m deg K
• Fire resistance 2-6 hours depending on thickness
• Sound reduction index 37-49 dB depending on thickness
• Face sizes and thicknesses vary by manufacturing plant

Applications

• Masonry walling

Specifications

Density (Oven Dry): 451-550 & 551-650 kg/m3 | Compressive Strength: As per IS 2185 Part (III) | Thermal Conductivity: 0.16 W/m deg K (average) | Fire Resistance: 2-6 hrs depending upon thickness | Sound Reduction Index: 37-49 dB depending upon thickness | Design Density: 800 kg/m3 (approx.) | Autoclave Curing: About 10-12 hours at 190 deg C, 12 bar saturated steam pressure

Standards: IS 2185 (Part III)

Packing: Sold by volume/piece; size by plant: Tumkur 600x200; Bhigwan 625x240; Kolkata 625x250 and 625x200; Surat 625x240 and 600x200; Palghar 625x240 and 600x200