Table 7 Chemical composition of sodium hydroxide.

From: Research on the properties of polymer stabilized coal gangue materials in rubber powder slag base

Inspection project

Water insoluble (%)

Density (g/cm3)

SiO2 (%)

Na2O (%)

Fe (%)

Modulus

Test results

0.29

1.264

26.2

8.8

0.02

3.07

Technical requirements

≤ 0.50

1.368–1.394

≥ 26.0

≥ 8.2

≤ 0.05

2.8–3.1