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With a wide variety of strengths and properties, Fibre Glast's Shore A and Shore D casting urethanes are great for functional prototypes and flexible molds. They can be used with other urethanes, or even with composite molds, or even as molds for some laminate parts. For more, read our white papers, Urethanes vs. Composites in Molds and Parts and Introduction to Casting Urethane Resins.

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Casting urethanes are versatile materials that can be used alone, with one another, or even with composites. From flexible molds to durable, impact-resistant parts, Fibre Glast's selection of urethanes offer a wide range of properties for a variety of uses.
Watch the video for a brief look at the different properties of Fibre Glast's Shore A and Shore D casting urethanes. For more information on the Shore Durometer scale, check out the Introduction to Urethane Casting Resins white paper on Fibreglast.com.

Shore A Urethanes as Molds

Fibre Glast's selection of Shore A Urethanes can be used as flexible molding materials to create molds with negative angles. Unlike composite molds which cannot release parts with negative angles, the soft, pliable Shore A urethane can be bent back (or even cut off) for easier release. If cast in thick sections, the pliable urethanes retain enough dimensional stability to mold composite parts. Building molds with the Shore A urethanes saves significant labor and time versus building small composite molds. As molds get larger, however, composites make more sense to use due to weight, cost and longevity.

The 40 Shore A (40A) and 60 Shore A (60A) resins allow for different amounts of flexibility — The 40A urethane is extremely pliable and resilient, about as hard as a pencil eraser, while the 60A is as hard as a tire tread.

Urethanes have limited life as molds when used with composites due to the exothermic reaction of composite resin systems and also due to chemical reactions with composite curing byproducts such as styrene. The styrene released as polyester resin cures gradually dries out urethanes, making their surfaces brittle over time. Applying release agents thoroughly will help create a strong barrier and minimize damage to the mold. Nonetheless, building a mold with urethanes is not optimal when working with composites for long-term use.

Shore A urethanes are excellent for casting other urethanes, including the Shore D urethanes and the 3500 Clear Urethane Casting/Coating Resin. Shore A urethanes, with low mixed viscosities, create pliable and resilient molds that can cast negative angles and complex shapes.

Shore A Urethanes as Parts

The tintable, amber Shore A urethanes can be cast as bumpers, protective parts, bushings, belts, gaskets and seals. The soft and strong materials may also be used to overmold rigid urethanes or composites to create handles, grips, squeegees and printing rolls. The Shore A urethanes can also be cast as sound-, shock- and vibration-dampening pads.

The Shore A urethanes have a de-mold time of 2.5--3 hours, depending on the part size and the temperature of the materials and ambient environment, and can completely cure at room temperature. They can be cast in urethane molds, as well as composite molds created with polyester and epoxy resins. The 40A and 60A have exceptionally low shrinkage, as well, of less than 1/1,000th of an inch per inch of material.

Shore D Urethanes as Molds

Due to their rigidity and cost, the 60 and 75 Shore D urethanes have limited uses as molds for composite parts. Based on cost and speed factors, most users turn to the 4113 Fast Set Tooling and Prototyping Urethane to create rigid 80-84 Shore D urethane molds quickly.
For urethanes, however, the 60 Shore D (60D) may be to cast extremely durable, long-lasting molds that can recreate precise replicas. The 60D urethane can even be used as foundry tools and patterns.

The 75 Shore D (75D) urethane is extremely rigid and inflexible compared to composite molds, even in thin sections, making de-molding of composites or rigid urethanes extremely difficult. Considering the material cost and physical characteristics, the 75D urethane has very few uses as a mold beyond the scope of the Fast Set urethane, which can be de-molded in under an hour and put into service quickly.

Read the entire White Paper here: http://bit.ly/urethanewhitepaper