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USG Dental Plaster - Impression is designed for use in oral impression work where very fast set times
are needed. Fast-setting USG Dental Plaster – Impression is easy to use and offers many applications
for dental stones. Its set time can be altered by the use of accelerators or retarders. Water soluble,
USG Dental Plaster – Impression requires no organic solvents for cleanup.
Please contact your local USG Sales Representative for further assistance for specific use
Normal Consistency 66 lbs. water/100 lbs. product (30 kg water/45 kg product)
Hand Mix Vicat Set, Target 3 - 5 minutes
% Passing - 100 mesh 98.5
Compressive Strength, Dry 2000 psi (13.8 MPa)
% Expansion 0.20%
NOTE: The Typical Physical Properties in the above table were achieved under controlled laboratory conditions with freshly
produced material, results may vary.
Use potable water at temperatures between 70 °F (21 °C) and 100 °F (38 °C). Because variations
in slurry (USG Dental Plaster - Impression and water mixture) temperature produce variations in
set time, it is important to keep both the USG Dental Plaster - Impression and water in a stable
temperature environment prior to use. The higher the temperature of the slurry, the shorter the set
time. Conversely, the lower the temperature of the slurry, the longer the set time.
Weigh both the USG Dental Plaster - Impression and the water prior to use for each mix. The waterto-
USG Dental Plaster - Impression ratio is critical because it governs the strength and the density
of the final cast.
Sift or strew USG Dental Plaster - Impression into the water slowly and evenly. Do not drop large
amounts of USG Dental Plaster - Impression directly into the water as proper soaking of the
USG Dental Plaster - Impression may not occur. USG Dental Plaster - Impression should be fully
dispersed in the water prior to mixing. Small batches require less soaking time than large batches.
See USG IG503 Plaster Mixing Procedures for specific soaking instructions.
Mixing USG Dental Plaster - Impression slurry is one of the most important steps in producing
USG Dental Plaster - Impression casts with maximum strength, absorption, hardness and other
Mechanically mixed slurries develop uniform casts with optimal strengths. USG Dental Plaster -
Impression can be mechanically mixed through both batch and continuous processes. Proper blade
and bucket dimensions are important for obtaining the best batch mix (see USG IG503 Plaster
Mixing Procedures for details).
Longer mixing times result in higher mold strength and shorter set times.
When mixed with water, this material hardens and becomes
very hot sometimes quickly. DO NOT attempt to make a
cast enclosing any part of the body using this material. Dust
from mixing may cause irritation to eyes, skin, nose, throat
and upper respiratory tract. Use only in a well-ventilated
area, wear a NIOSH/MSHA-approved respirator. Wear eye
protection. If eye contact occurs, flush thoroughly with
water for 15 minutes. If on skin: Wash with plenty of water. If
swallowed and/or irritation persists, call physician. For more
information call Product Safety: 800-507-8899 or see the
KEEP OUT OF REACH OF CHILDREN.