Smooth-On Smooth-Cast 380 is a filled, high density casting resin formulated for a variety of tooling applications. This no-odor resin features a convenient 1A:1B mix ratio by volume, a 6 minute pot-life and cure time of about 60 minutes depending on mass and temperature.
Low viscosity ensures minimal bubble entrapment and long term shrinkage of cured resin is very low. Cured material is very strong and can be machined, drilled, sanded, etc. Color can be added with SO-Strong® color tints.
Mix Ratio: 1A:1BColor: TanPot Life: 6 minutesCure Time: 60 minutesShore Hardness: 82D
SMOOTHCAST 380 Data.pdf
Material is heavily filled and the filler will separate from the liquid during storage. YOU MUST STIR BOTH PART A & PART B WELL BEFORE USING - It is important to stir both Parts A & B individually with a paddle or power drill mixer to re-disburse the fillers thoroughly before dispensing.
Applying A Release Agent - A release agent is necessary to facilitate demolding when spraying into or over most surfaces. Use a release agent made specifically for mold making (Universal® Mold Release or Mann’s Ease Release® 200 available from Smooth-On or your Smooth-On distributor). A liberal coat of release agent should be applied onto all surfaces that will contact the plastic. Most silicone rubber molds usually do not require a release agent. Using a release agent, however, will prolong the life of the mold.
IMPORTANT: Apply release agent to all surfaces that will contact the rubber. To ensure thorough coverage, lightly brush the release agent with a soft brush over all surfaces of the model. Follow with a light mist coating and let the release agent dry for 15 minutes.