Preparation and Sealing Performance of a New Coal Dust Polymer Composite Sealing Material

Table 1

Values of factors and levels.

Level	Factor
	Coal-dust content (%) (A)	Water-material ratio (B)	Cross-linking agent content (%) (C)
1	50	1.0 : 1	1.5
2	75	1.2 : 1	2.0
3	100	1.5 : 1	2.5
4	125	1.9 : 1	3.0