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Heat Resistant
TASK™ 8 - Urethane casting resins are generally not
known for high temperature resistance. TASK™ 8 is a urethane
resin that resists temperatures up to 265° F /130° C. Like any
high temperature resistant urethane resin, you need to heat
cure this product according to the cure schedule on the
technical bulletin.
TASK™ 8 features a convenient mix
ratio, low viscosity and has good physical properties. It has
a 2.5 minute pot life and cures to an 80D. TASK™ 8 is good for
making heat resistant prototype and mechanical parts.
Improving
Heat Resistance Of Some Other Smooth-On Resins - As
you may know, post curing any Smooth-On liquid plastic or
rubber at 150°F/65°C for 4 to 6 hours will improve the overall
physical and performance properties. Some Smooth-On plastics
however, will experience dramatically improved heat resistance
by step-heat-curing them at higher temperatures.
Which Plastics? Smooth-Cast 320, Smooth-Cast 385, Task
6, Task 21 and C-1508.
What Cure Schedule? After
allowing the casting to fully cure at room temperature,
post-cure in the silicone mold at 175°F / 80°C for 2
hours, followed by 100°C. Remove mold from oven and let cool
before demolding.
Important: 1) At these
temperatures, you can only use silicone rubber as the mold
material, and 2) The plastic softens when exposed to these
temperatures and will distort if you try to post cure it
outside of the mold. |
Smooth-On