33# Buffstone (labstone buff)

From Whip Mix website:

ISO Type 3

An economically priced type 3 gypsum for all general purpose lab uses. Buff stone features an extended working time which allows technicians to do multiple pours of models or bases.

Physical Properties:

Water/Powder Ratio: 30 mL/100 g

Working Time: 6 – 8 minutes

Setting Time: 15 minutes

Setting Expansion: .15%

Compressive Strength, Wet (1 hour): 4,000 psi (28 MPa)

Compressive Strength, Dry (48 hrs.): 8,000 psi (56 MPa)