USG® Plaster and Gypsum Cements Specifications

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Mix Ratio 
Parts Water 
By Wt. Per 
100 Parts 
Plaster

Set Time
(Min.)

% Setting
Expansion
Max.

Approx. Density
(lb./ft.3)
Wet

Approx. Density
(lb./ft.3)
Dry

Compressive
Strength (psi) 
Dry

USG Gypsum Cements

Ultracal 30

38

25-35

0.08

115.00

99.00

6,000

Ultracal 60

39

75-90

0.07

114.40

97.50

5,000

Hydrocal A-11

42

16-20

0.08

112.50

93.80

5,500

Hydrocal B-11

44

25-35

0.08

111.20

91.60

4,500

White Hydrocal

45

25-35

0.39

110.60

90.00

5,000

Hydrocal FGR-95

30

50-70

-

112.0

101.6

-

Hydrostone

32

17-20

0.24

119.40

108.70

10,000

USG Industrial Plasters

Molding Plaster

70

27-37

0.20

99.00

69.00

2,000

#1 Casting Plaster

65

27-37

0.22

100.00

72.50

2,400

#1 Pottery Plaster

70

27-37

0.21

99.00

69.00

2,000

Lab Dental Plaster

70

6-9

-

99.00

69.00

2,000

Puritan Pottery Plaster

66

27-37

0.22

101.0

72.50

2,400

Duramold

62

27-37

.220

102.5

75.0

2,900