Designation

Earth (%)

Water (%)

Cement (%)

Sawdust (%)

BTC 0

87

13

0

0

BTC C4

83

13

4

0

BTC C6

81

13

6

0

BTC C8

79

13

8

0

BTC Sp4

83

13

0

4

BTC Sp6

81

13

0

6

BTC Sp8

79

13

0

8