Elkem Silicone HCRA 4530 30A (HCR) High Consistency Rubber (A-4530-HCRA)

A-4530-HCRA Silicone Gum (Heat Cure HCR, Shore A 30)

A-4530-HCRA is a platinum-cure, high consistency rubber (HCR) silicone gum offering a combination of flexibility and strong mechanical performance. With a Shore A 30 durometer, it provides a softer, more flexible option within the HCRA series while still maintaining excellent durability and tear strength.

Supplied in a gum form, this material allows technicians to sculpt, shape, and laminate directly into the silicone prior to cure. It is dimensionally stable with minimal shrinkage and bonds well to a variety of substrates, making it ideal for detailed fabrication work.

The material offers an extended working time of up to 6 hours (at ~65°F), allowing ample time for processing. Final cure is achieved through heat, producing a resilient, elastic finished part.

Product Features

• Shore A 30 silicone gum for enhanced flexibility

• Platinum-cure (addition cure) system

• High consistency (gum) form for sculpting and shaping

• Excellent mechanical properties

• Low to no shrinkage for dimensional stability

• Bonds well to various substrates for lamination

• Long working time (~6 hours at 65°F)

• Heat cure required

Processing Notes

• Supplied as a two-part system (Part A & Part B)

• Mix equal parts thoroughly prior to use

• Two-roll mill required for proper blending and pigment incorporation

Typical Applications

• Sculpted silicone components

• Laminated silicone structures

• Applications requiring flexibility with strength

Physical Properties (Typical)

• Durometer (Shore A): ~30 (range 25–35)

• Tensile Strength: up to ~2000 psi

• Elongation: up to ~1000%

• Tear Strength: up to ~247 lb/in

• Appearance: Clear

A flexible HCR silicone designed for detailed fabrication and applications requiring a softer, durable elastomer.