Table of Contents
What is ultracal 30 used for?
USG Ultracal® Brand 30 Gypsum Cement is designed for the patternmaking industry as the ultimate gypsum cement tooling medium. When extreme accuracy and greater surface hardness are required (as in duplicator models), use USG Ultracal 30 Gypsum Cement.
What is the difference between Hydrocal and Ultracal?
Ultracal 30 is more dense and harder than Hydrocal and is advertised by USG as a tool making plaster. Hydrocal is a casting plaster that hold detail well. Hydrocal is easier to work with post casting for corrections. Ultracal is more durable.
How long for ultracal 30 to set?
THIS PRODUCT IS FOR PROFESSIONAL USE ONLY. KEEP OUT OF REACH OF CHILDREN. MIX RATIO: The manufacture recommended mix-ratio of Ultra Cal 30 is: 38 parts water to 100 parts Ultra Cal 30 by weight. The average setup time is 25-35 minutes when manually mixed.
What is ultracal 30 made of?
ULTRACAL 30 is a plaster cement tooling material, which creates a hard, uniform and dimensionally accurate piece. Used for slush casting latex and production of master models.
How strong is Ultracal 30?
Compressive Strength, Dry: 6500 psi (44.8 MPa) Density, Wet: 116 lbs./cu.
Is Ultracal 30 waterproof?
Quick setting, dense white plaster in water resistant bag. Ideal for patterns, figurines, commercial casts, and sculpture. Ultracal 30 is 30% to 50% harder than casting plaster and works much like plaster in mixing, pouring, and setting.
Is pottery plaster the same as plaster of Paris?
Pottery plaster is harder than Plaster of Paris. So, it is better for casting molds that experience wear and tear. However, Plaster of Paris is usually less expensive and is suitable for low wear and tear items. Also, some makes of Plaster of Paris are as strong as pottery plaster.
How long does Hydrocal last?
It’s not the most cost-effective way to purchase Hydrocal, but it comes in a convenient, re-sealable container. When my last jar got down to the bottom, I discovered that, even in a closed jar, it has a shelf life of a year or two.
What is gypsum cement?
Gypsum is a mineral and is hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement. Gypsum is added to control the “setting of cement”. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing.
Who makes ultracal30?
Buy UltraCal® 30 Gypsum Cement from Reynolds Advanced Materials.
What is gypsum plaster?
Gypsum plaster is a white cementing material made by partial or complete dehydration of the mineral gypsum, commonly with special retarders or hardeners added. Applied in a plastic state (with water), it sets and hardens by chemical recombination of the gypsum with water. See also plaster of paris.
What is the difference between hydrostone and Hydrocal?
Hydrostone and hydrocal are both gypsum products. The difference is that hydrostone is considerably harder and lacks the period of plasticity in the setting curve which enables the plaster to be worked directly. It is considered the strongest and hardest gypsum cement available.
How strong is Hydrocal?
It is not for making outer or mother molds, and it is not recommended for outdoor use. Designed for strength and casting detail. Hydrocal is 30% to 40% harder than casting plaster and works much like plaster in mixing, pouring, and setting.
What is hydrostone plaster?
Hydrostone is a U.S. Gypsum product which is considerably harder than regular plaster of Paris, and lacks the period of plasticity in its setting curve which allows plaster to be worked directly. All plaster products should be mixed thoroughly, for at least two minutes.
How do you mold Gypsum?
How to cast gypsum or plaster stone Add water to the bucket. Add plaster slowly until plaster stop absorbing water. Let it stay in bucket 5-10 min (do not mix) Mix carefully with hands and pour to the mold immediately. Shake mold from side to side to release an air pockets for face for the stone.
What kind of plaster is used for pottery?
The most widely used plaster in the pottery studio is USG® No. 1 Pottery Plaster. This plaster is ideal for making slip-casting molds and other plaster castings where a high degree of water absorption is required. Pottery #1 requires 70 pounds of water to set up 100 pounds of dry plaster.
What is stronger than plaster of Paris?
Hydrocal is much stronger than plaster of paris. It also takes lots more detail, and most of all does not ‘slough off’ like plaster of paris. That is important for a long life scenery base. The sloughing of plaster results in lots of dust and chips on a continuous basis.
What is the hardest plaster?
PURITAN POTTERY PLASTER – Unique, specially designed for use with mechanical clay forming machinery. Absolutely the hardest, most wear-resistant plaster made for molds, and a favorite for jiggering molds. STATUARY HYDROCAL – A basic HYDROCAL cement with a lower use consistency of about 40 lbs. of water per 100 lbs.
How do you make a lightweight Hydrocal?
What is the mix ratio of Lightweight Hydrocal? The mix ratio of Lightweight Hydrocal is 5 parts Hydrocal to 2 parts water (1 1/4 cups Hydrocal to 1/2 cup water).
How do you mix Hydrocal?
The mix ratio for use as a bore coating is approximately 1.5 (powder) :1 (water) by volume. The mix ratio for use as a high temperature (HT) reinforced coating is approximately 2.5 (powder) :1 (water) by volume. For slurry application, add powder to water and mix until desired consistency. Use the slurry immediately.
Is gypsum harmful to humans?
If handled improperly, gypsum can cause irritation to the skin, eyes, mucous membranes and the upper respiratory system. Symptoms of irritation can include nosebleeds, rhinorrhea (discharge of thin mucous), coughing and sneezing. If ingested, gypsum can clog the gastrointestinal tract.
How thick is Gypcrete?
over concrete, the minimum thickness of Gyp-Crete is usually 1⁄2″ (13 mm). however, the 1.4 mix design can be featheredged. in wood renovation, Gyp-Crete is installed at a minimum depth of 3⁄4″ (19 mm).
Can I mix gypsum with cement?
Gypsum plays a very important role in controlling the rate of hardening of the cement. Gypsum is added to control the “setting of cement”. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing.
