What does the TB after the name mean?

USG Hydrostone TB is the low-expansion version of regular Hydrostone. Values from the USG Datasheets, first value is Hydrostone, second is Hydrostone TB Mix Ratio, by weight, parts water to parts powder: 32, 30 to 32 Setting Time: 19-25min, 15-23min Compressive Strength, 1 Hour: 4,000psi, 3,000psi Compressive Strength, Dry: 10,000psi, 8,000psi pH: 7.73, 11.13 Max Expansion: 0.24%, 0.09% Setting time is influenced by the temperature of the water and powder when mixing. Temps in the range of 50-70F extend the setting time, while temps in the range of 70-90F shorten the setting time. Above 80F, the setting time may be just a few minutes. Compressive strength is influenced by completeness of mixing, and USG recommends a power mixing blade for larger batches. A kitchen whisk tool with vigorous motion works for small batches, roughly less than 0.5lb/250g.

Would this be hard enough to cast small details without those small details easily breaking off? And strong enough to send through the mail?

Yes it is very hard. I mail things that are made of hydro stone all the time. I do wrap the thinnest pieces with extra bubble wrap. Hope that is helpful.

Is this good for body casting art (pouring into the casted mold) or is there something better to use?

Don’t think it would be good for that because there are warnings that it can cause irrational or burns to skin. I used it for molding walls and floor tiles for miniature gaming. Worked great for that.

How well does it take color?

Before painting you will need a clear sealer. I use spray paint.

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USG HYDROSTONE TB 10 lb Bag - Gypsum Cement - Extremely Hard, High Compressive Strength, Fine Detail

USG HYDROSTONE TB 10 lb Bag - Gypsum Cement - Extremely Hard, High Compressive Strength, Fine Detail

Product ID: 483977649

Details

Brand
USG Interiors
Item Form
Powder
Material
stone
Special Feature
durable
Specific Uses For Product
art

🎨captures ultra-fine detail

💪50% harder than regular plaster

🏛️high compressive strength

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Description

🏆 Sculpt with strength, detail, and brilliance — don’t settle for less!

BRIGHT WHITE FINISH - Cures to a brilliant white, enhancing the visual impact of your creations.
UNMATCHED DURABILITY - Hydrostone is 40-50% harder than standard casting plaster, ensuring long-lasting strength.
WATER RESISTANT FORMULA - High resistance to water absorption keeps your work pristine and durable.
PRECISION DETAIL CAPTURE - Perfect for sculptures and architectural models that demand razor-sharp fine detail.
VERSATILE ARTISTIC MEDIUM - Ideal for dioramas, trophies, and statuary—engineered for professional-grade results.

USG Hydro-Stone TB Gypsum Cement is a premium, extremely hard gypsum plaster that offers 40-50% greater hardness than regular casting plaster. It delivers high compressive strength, water resistance, and exceptional fine detail capture, curing to a bright white finish. Perfect for professional artists, sculptors, and architects seeking durable, precise, and visually striking castings.

Specifications

ASIN	B089QXXS31
Brand	USG Interiors
Brand Name	USG Interiors
Colour	White
Compatible Material	Stone
Container Type	Bag
Item Form	Powder
Item Package Quantity	1
Item Weight	4.54 kg
Manufacturer	USG
Manufacturer Part Number	HydrostoneTB10lb
Material	stone
Material Type	stone
Model	72194
Other Special Features of the Product	durable
Special Feature	durable
Specific Uses For Product	art
UPC	821079271425
Unit Count	4731.76 Milliliters
Volume	6.25 Gallons
Water Resistance Level	Water Resistant

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