Experimental Study on the Influence of PVA Content on the Performance of Grouting Material in Deep Stope

Table 3

Quality index of polyvinyl alcohol.

Item	Content	Light transmittance	Average degree of polymerization	Nonvolatile matter	Sodium acetate	Acetate
Requirement	≥90%	≥85%		≤7%	≤0.5%	≤0.5%