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U.S. Gypsum DRYSTONE™ Casting Media 50 lbs. Bag.
DRYSTONE
is a fast setting high strength product that needs no drying. An
environmentally sound alternative to resin-based products. No hazardous
chemicals or waste, no styrene emissions and no required environmental
controls.
– No drying required—cast, paint, package, and ship in one day.
– Excellent duplication of fine detail.
– Can be painted or decorated within 2-4 hours of demolding.
– Highest compressive strength of any product offered.
– Highest early “green strength” of any product offered.
– Excellent alternative to polyester resin.
– Use for solid cast pieces.
DRYSTONE™ Casting Media Typical Physical Properties
Use Consistency (per 100g) 18-20 cc
Working Time (after mix) 5-10 minutes
Demolding Time (after set) 15-25 minutes
Maximum Temperature (during hydration) <190 °F
3 Hour Expansion (max.) 0.275%
Surface Hardness (kg) load for 0.01 penetration of 10 mm steel ball 226 kg
Compressive Strength
1 Hour (ambient) 8,000 psi
2 Day (ambient) 10,000 psi
Dry (oven-dried) 16,000 psi
Cast Density
Wet 130 lb./ft.3
Dry 128 lb./ft.3
Dry Modulus of Elasticity 1.78x106
Dry Modulus of Rapture 2,500 psi
% Absorption 24-Hour Immersed 2.5%
Preparing the Mix
Use potable water at temperatures between 70 and 100 °F (21 and 38 °C). Since variations in slurry (DRYSTONE
and water mixture) temperature produce variations in setting time, it is important to keep both DRYSTONE and
water in a stable temperature environment prior to use. The higher the temperature of the water, the shorter the
set time.
Measuring Weigh both DRYSTONE and water at the recommended use consistency for each mix (see technical properties
above). The water-to-DRYSTONE ratio is critical because it governs all physical properties of the final cast piece.
Soaking Do not soak DRYSTONE Regular or DRYSTONE Ultimate.
Mixing Properly mixing DRYSTONE gypsum cement is the most important step in producing casts with maximum
strength, hardness, and other important properties.Unlike other plasters and gypsum cements, DRYSTONE cannot
be mixed by hand and must be mixed mechanically. Additionally, DRYSTONE can only be mixed by a batch
process, not by a continuous process mixer. To properly mix DRYSTONE, follow these easy steps:
1 Weigh the DRYSTONE Casting Media and water accurately for each mix. For better accuracy use a digital scale.
2 Sift or strew 1/2 to 2/3 of the DRYSTONE Casting Media into the water slowly and evenly. Use the proper
mechanical mixer and mixing bucket
3 Start mixing to incorporate this material into the water immediately.
4 Once incorporated, continue to add the remaining DRYSTONE Casting Media to the mix while the mixer is
running.
5 Continue mixing until all the powder is incorporated.
6 Mix for a total of 2-4 minutes until a lump of slurry is achieved.
Depending on actual batch size, adjustments can be made to the mixing cycles, typically, larger batches may
require slightly longer mixing cycles.
For
best results, use the recommended mixer/mixer motor combination as
indicated in Figure 1. The mixing shaft should be maintained at an
angle 15° from vertical. The shaft should be about halfway between the
center and the side of the container. The propeller or HANSON mixer
should clear the bottom of the container by 1 to 2 inches, forcing the
mix downward. Keep all equipment clean to avoid acceleration of the
reaction between the water and the DRYSTONE Casting Media.
Pouring
DRYSTONE Casting Media DRYSTONE Casting Media can be used with most
mold materials such as silicone, latex, or urethane-type molds.
To
prepare the mold, make sure it is clean, then dip the mold or spray it
with a suitable mold rinse. Using a steady rate, pour the DRYSTONE
Casting Media slurry into one corner of the mold or into the lowest
point and allow the slurry to rise and seek its own level. Continue
pouring until the mold is full. To minimize air entrainment,
mechanically vibrate or shake the mold or the surface onto which the
mold is placed. Do not vibrate for more than 30 seconds.
Demold the DRYSTONE after it reaches peak heat (approximately 30 minutes).
Finishing
If trimming is required, do so immediately after demolding. For best
results, place cast piece in front of a fan for at least two hours.
DRYSTONE Casting Media products can be decorated approximately 2-4 hours after set time.
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