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Rubber Concrete Molds

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Cast Concrete Molds

Can't find the concrete molds to fit your projects requirements? Precision Urethane can create polyurethane rubber molds based on your requirements or personal artwork. We will work with you to fully customize the rubber mold you need. Cast concrete molds offer flexible solutions for a variety of concrete processing applications, or your own DIY projects. Urethane's outstanding ability to adhere to metal, and our total fabrication facilities allows our concrete molds to encapsulate metal reinforcing substructures while maintaining a soft durable exterior to aid in the de-mold process.

Why use Urethane for Casting Concrete Molds?

Liquid rubber (polyurethane) is a great way to make durable, perfectly smooth rubber molds for concrete. It is typically less expensive and has a high abrasion-resistance than silicone molds. Urethane rubber concrete molds do not shrink and come in a range of hardness. Their high abrasion resistance and strength make it possible for them to be used again and again.

Urethane molds offer incredible flexibility. Rubber concrete molds can easily release from intricate details, including undercuts once the concrete has set. This flexibility allows for both large and small applications: from small DIY crafts such as candles and soaps, to large industrial architectural elements. Other possibilities include sinks, drainboards, soap dishes, countertops, architectural elements, glass fiber reinforced concrete (GRFC) concrete statues, edges, and many other products.

Process of Creating Rubber Concrete Molds

Urethane rubber can be either poured, brushed or sprayed onto most prepared surfaces. The process can vary according to the size and amount of detail on the product. Good ventilation and rubber gloves are necessary to avoid inhaling fumes and minimizing skin contact. When casting a rubber concrete mold, it is important to use sealing and releasing agents because urethane rubber is not self-releasing. Humidity is also kept at a minimum to avoid reaction with the polyurethane. This will allow for a clean, smooth finish and easy removal. If uncured rubber gets onto a working surface, it can be removed with acetone.

When using polyurethane rubber for concrete molds Precision Urethane recommends using a 74-45 or a 75-60 material for concrete countertops. The second number indicates the Shore A hardness—a 60 is about the hardness of a car tire and the 45 is a bit softer.

Our knowledgeable sales representatives can help you to create the perfect rubber mold for your concrete projects. We offer the following services to help you create the perfect mold:

Contact one of our sales representatives today
to inquire about a quote from Precision Urethane
or call us today at 800-475-2072


Cast Products
Society of Plastics Engineers Polyurethane Manufacturers Association

Precision Urethane
612 3rd St
Hempstead, TX 77445

800-475-2072