Buying Dental Lab Gypsum in Bulk: 25 lb vs 50 lb Garreco Stone

When buying dental lab gypsum in bulk, the 50 lb box makes sense for the stone you pour every day, while the 25 lb box is the smarter buy for specialty stones and anything you use slowly. Every Garreco plaster and stone at Chase Dental Supply comes in both sizes, so you can size each product to your actual usage.

This guide covers how to estimate usage, how to store gypsum so it performs as labeled, and which Garreco products most labs stock in each size.

Key Takeaways

• A 25 lb box holds about 11.3 kg of powder; a 50 lb box holds about 22.7 kg.
• Match box size to how fast you use each product, not just to the lowest cost per pound.
• Gypsum absorbs moisture from the air, so storage matters as much as box size.
• All six Garreco gypsum products come in 25 lb and 50 lb; Fastone is also listed in 10 kg and 25 kg.
• Color coding by product (for example blue Labstone, white Mounting Stone) prevents mix ups when you stock several stones.

Buying dental lab gypsum in bulk: should you choose 25 lb or 50 lb boxes?

Buy 50 lb boxes of the products you go through quickly and 25 lb boxes of the ones you use occasionally. The right size is the one you will finish while the powder is still in good condition.

Larger boxes mean fewer orders, less packaging and fewer chances to run out mid case. Smaller boxes mean less open powder sitting around, easier lifting and less shelf space, which matters for dental offices and small labs.

A common pattern is to buy one or two core stones in 50 lb boxes and everything else in 25 lb. As your volume changes, move a product up or down a size on the next order.

How do you estimate how much stone your lab uses?

Estimate usage by weighing a typical pour and multiplying by your weekly case count. That gives you a real number to size orders against instead of guessing.

1. Weigh the powder you use for a typical pour of each product for a week.
2. Multiply grams per pour by pours per week to get weekly grams.
3. Divide about 11,340 g (25 lb) or 22,680 g (50 lb) by your weekly grams to see how many weeks a box lasts.
4. Repeat for each stone and plaster you stock.

Weighing also improves your models. Garreco lists a 30 ml to 100 g water to powder ratio for Tecstone, Fastone, Labstone and Mounting Stone, 35 ml to 100 g for Flasking Stone and 45 ml to 100 g for Dental Plaster. Measuring both every time keeps strength and expansion close to the published specs, and our Whip Mix Vac-U-Mixer guide covers mixing equipment that makes that easier.

How should you store dental gypsum?

Store dental gypsum sealed, dry and off the floor. Gypsum powder picks up moisture from the air, and damp powder can set faster or slower than labeled and lose strength.

• Keep boxes in a cool, dry area away from sinks, model trimmers, steamers and boil out tanks.
• Reseal opened boxes tightly or transfer powder into airtight bins with lids.
• Label bins with the product, color and date opened.
• Rotate stock so older boxes are used first.
• Keep boxes off concrete floors, which can hold moisture.

Good storage is what makes bulk buying work. A 50 lb box that sits open in a humid lab can end up costing more in remakes than it saved.

Which Garreco gypsum products should you buy in bulk?

Buy your highest volume model stone in bulk first, then size specialty stones to how often you use them. Here is how the Garreco line breaks down.

Core model stones

Garreco Tecstone and Garreco Fastone are the most common 50 lb buys because they cover denture models, flasking and crown and bridge bases. Fastone has Tecstone’s 9,000 psi strength and 0.12% expansion with a faster 10 to 12 minute set, so many labs pick one or the other as their main stone.

Not sure which to make your daily stone? See Garreco Tecstone vs Fastone vs Labstone.

Study model stone

Garreco Labstone is a fine all purpose Type III stone with an 8 to 10 minute set. Offices and ortho practices that pour their own study models often buy it in 25 lb boxes, while labs with steady diagnostic model work may move to 50 lb.

Specialty stones and plaster

Garreco Flasking Stone and Garreco Mounting Stone are usually 25 lb purchases unless a lab does high volume denture or implant work. Garreco Dental Plaster is often bought in 50 lb boxes by labs that articulate in volume. Garreco lists separate item numbers for each set speed and size: 25 lb Slow (#1550025), 50 lb Slow (#1550050), 25 lb Regular (#1450025), 50 lb Regular (#1450050), 25 lb Fast (#1500025) and 50 lb Fast (#1500050).

How do you place a bulk gypsum order?

Pick your product, color and size on each product page, or call Chase Dental Supply for help building a mixed order.

If you need metric sizes for an international lab, Garreco notes that metric units are available on request, so ask when you call. For more on how plaster, stone and die stone differ before you commit to a box size, read Dental Stone Types Explained, or browse every brand we carry in the dental lab and office supply brands guide.

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Frequently Asked Questions

Should my lab buy 25 lb or 50 lb boxes of dental stone?

Buy 50 lb boxes of the stone you use every day and 25 lb boxes of specialty or lower volume stones. The goal is to finish each opened box while the powder is still fresh and dry, so match box size to how quickly your lab actually uses each product.

How many grams are in a 25 lb box of dental stone?

A 25 lb box holds about 11.3 kg, or roughly 11,340 g, of powder, and a 50 lb box holds about 22.7 kg. Divide that by the grams of powder in a typical pour to estimate how many pours a box will give you.

How should dental gypsum be stored?

Store dental gypsum sealed, off the floor and in a cool, dry area away from sinks and steam. Gypsum powder absorbs moisture from the air, which can change its setting time and strength, so reseal opened boxes or transfer powder to an airtight bin and use older stock first.

Which Garreco products come in 25 lb and 50 lb sizes?

Garreco Tecstone, Fastone, Labstone, Flasking Stone, Mounting Stone and Dental Plaster are all available in 25 lb and 50 lb sizes at Chase Dental Supply. Fastone is also listed in 10 kg and 25 kg sizes, and Garreco offers metric units for international customers on request.

How do I get pricing on a bulk Garreco order?

Call Chase Dental Supply at 888-548-7582 or email sales@chasedentalsupply.com with the products, colors and box sizes you need.

Buying dental lab gypsum in bulk pays off when each box size matches real usage and storage keeps the powder dry. Shop Garreco at Chase Dental Supply for 25 lb and 50 lb boxes of every Garreco stone and plaster, or email sales@chasedentalsupply.com to plan a mixed order.