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Home Products Specification for Precast concrete Insulation blocks
Specification for Precast concrete Insulation blocks

01. TYPE OF INSULATION BLOCKS:
Block is a masonry unit which when used in its normal aspect exceeds the length or width or height dimensions of a Block. Insulation Blocks are slotted hollow blocks to give higher thermal resistance. It gives three times better heat insulation than normal concrete blocks & two time better heat insulation than clay blocks.


02. SIZE:
Following table gives the various sizes of blocks that we are manufacturing :-

Length Width Thickness (mm)

 400 mm 200 mm
200 mm 250 mm


03. DIMENSIONAL DEVIATION:

The maximum dimensional deviation for blocks measured in accordance with the methods of test for Precast concrete blocks is as follows:-

Dimension Maximum dimensional deviation

Length +3mm, -5mm

Height +3mm, -5mm

Thickness +/- 2mm average      +/- 4mm at any individual point


04. COMPRESSIVE STRENGTH:
The value of the crushing strengths of ten blocks tested in accordance with the method of test for Precast concrete blocks.

Blocks are tested for compressive strength in accordance with the specification of BS 6073. Table below gives the crushing strength of 10 blocks per consignment of 100 blocks.

Type Minimum average Lowest Individual Block

7.0 N/mm2 7.0 N/mm2 5.0 N/mm2

10.0 N/mm2 10.0 N/mm2 8.0 N/mm2


05. INSULATION MATERIAL:
Insulation used is 14kg/Mexpanded polystyrene sheet, which is inserted inside the cavity of slotted blocks. The insulation gives the heat resistance & isolates the inner and outer wall of blocks.


06. THERMAL PROPERTIES OF INSULATED BLOCKS:
8” Insulation Block
     Thermal Resistance R = 1.58 M² °C/W
     U-Value = 0.63 W/M² °C
     No. of Polystyrene in slot = 5 with 17 mm thickness

10” Insulation Block
    Thermal Resistance R = 2.50 M² °C/W
    U-Value = 0.40 W/M² °C
    No. of Polystyrene in slot = 4 with 30 mm thickness