High-performance High-elasticity Silicone Rubber

Molds that normally require many parts to release complicated or difficult patterns cannow be done easily and simply.

Castaldo SuperStretch™ was able to mold this hollow gold spiral sea shell charm without complicated multi-part inserts. The thin spiral core needed to reproduce the shell is strong and elastic enough to be withdrawn from wax patterns 100’s of times.

Just look at the shine!

SuperStretch High Shine Finish means less polishing. Cuts like butter. Easy mold packing / easy mold cutting. Low rubber shrinkage - only 1.3%.

SuperStretch is compatible with other Castaldo silicone molding rubbers - can be used alone or used as an insert for special projects.

Castaldo SuperStretch Jewelry Molding Rubber is available in strips 3/8” x 2 7/8” x 18” ( 6 mm x 7.3 cm x 45.7 cm ). Packed in boxes containing
5 lbs. ( 2.27 kg. ) each. Or 30 cm x 30 cm x 7 mm squares (11.8” x 11.8” x 3/8”) packed in 20 kg. /44 lb. and 5 kg. /11.0 lb. convenience packages

Castaldo Super Stretch Jewelry Molding Rubber Physical Properties

Shore A Hardness
Vulcanizes at 165°
Rubber Shrinkage*
Elongation before break
Tensile Strength before break
Tear Strength before break 19.2 n/mm /110 lbs./in.
165° -176°C / 330° – 350°F
Low - 1.3%
7.7 n/mm²/ 109 psi
19.2 n/mm /110 lbs./in.