1. Purpose:

a. Ordinary types of acid resistant castables can be used for masonry or pouring the lining of reinforced concrete chimneys (flues) operated by electrostatic precipitator.

b. Ordinary ultra lightweight and lightweight Type I acid resistant castables can be used for masonry or pouring the lining of double tube, multi tube or sleeve type reinforced concrete chimneys (flues) operated by electrostatic precipitator, and can be applied to similar chimneys in soft foundation areas, earthquake areas and cold areas.

c. Dense acid resistant castables are suitable for lining reinforced concrete chimneys (flues) that operate in a wet dust removal (desulfurization) manner during masonry or pouring.

d. Ultra lightweight, lightweight Type I dense acid resistant castable, suitable for lining double tube, multi tube or sleeve type reinforced concrete chimneys (flues) that operate in wet dust removal (desulfurization) mode during masonry or pouring.

2. Technical requirements

Technical requirements for ordinary lightweight acid resistant castables

The project unit is ultra lightweight and lightweight

Type I, Type II, Type III, Type IV

Bulk density Kg/m3 750~1000 1000~1200 1200~1400 1400~1650 1650~1900

Thermal conductivity at room temperature W/(m.k) ≤ 0.35 ≤ 0.45 ≤ 0.55 ≤ 0.70 ≤ 0.90

Room temperature compressive strength Mpa ≥ 8.0 ≥ 10.0 ≥ 12.0 ≥ 14.0 ≥ 17.0

Acid resistant appearance does not allow abnormal phenomena such as corrosion, cracks, peeling, etc

fs/f0 ≥0.9

Corrosion, peeling, and a linear change rate greater than 2.0% are not allowed in the heat-resistant appearance

fr/f0 ≥0.9

Natural drying shrinkage rate% ≤ 2.0