How long does it take to be hard enough for taking the mold off?

In general, you should be able to remove the mold from the plaster in 20-30 minutes. My experiences is with small, shallow casting between 1/2 to 1 inch thick. The casting will remain wet for up to 24 hours, depending on room temperature, so be gentle in removing the mold.

Can this be used for making molds for pouring porcelain? The molds would be placed in a kiln and fired at a high temperature for the porcelain to cure

I don't see why not? I made bats to dry out my recycled clay, so I haven't put them in the kiln, but it's just regular plaster used in ceramics as far as I can tell. You might want to test one before you commit to putting your work at risk. You could also buy plaster from a clay vendor whom you can ask to make sure it is kiln-worthy.

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High Strength 20 Plaster for Scenery, Dioramas, Dentistry and Mold Casting 5 lb Pack Resealable Bag Great for Model Railroads & Gaming by Capital Ceramics

High Strength 20 Plaster for Scenery, Dioramas, Dentistry and Mold Casting 5 lb Pack Resealable Bag Great for Model Railroads & Gaming by Capital Ceramics

Product ID: 579617082

Details

Age Range (Description)
Adult
Brand
Capital
Colour
white
Material
Plaster
Number of Items
1

⚡20-30% harder than Plaster of Paris

💧Water-resistant resealable bag

⏱️Quick setting formula

Description

🎨 Cast with Confidence, Create with Power!

MESS FREE MASTERY - Resealable, water-resistant packaging keeps your plaster fresh and ready for every project.
UNMATCHED DURABILITY - Experience 20-30% greater hardness for flawless, long-lasting casts.
VERSATILE CREATIVITY - Perfect for scenery, model railroads, dentistry molds, and intricate figurines—your all-in-one casting solution.
SPEED MEETS PRECISION - Quick setting plaster lets you create detailed models faster without sacrificing quality.
VIBRANT CUSTOMIZATION - Easily accepts liquid or crystal pigments to bring your dioramas and sculptures to life.

Capital Ceramics High Strength 20 Plaster is a premium, high-density plaster that sets quickly and offers 20-30% more hardness than standard Plaster of Paris. Packaged in a water-resistant resealable bag, it’s ideal for detailed casting in scenery, dioramas, dentistry molds, and model railroads. Non-toxic and pigment-friendly, this 5 lb pack empowers professionals and hobbyists alike to achieve durable, vibrant, and precise results every time.

Specifications

ASIN	B01MQOWXKL
Age Range Description	Adult
Brand Name	Capital Ceramics
Colour	white
Customer Reviews	5.0 5.0 out of 5 stars (1)
Educational Objective	Creative Skill
Included Components	clay
Item Dimensions	38.1 x 25.4 x 10.2 Centimeters
Manufacturer	Capital Ceramics
Manufacturer Part Number	PP05
Material Type	Plaster
Model Name	High Strength 20 Plaster
Number Of Items	1
Other Special Features of the Product	Non-Toxic
Recommended Uses For Product	Modeling
UPC	027829502638
Unit Count	1.00 Count

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