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How to Keep Moisture Out of Dried Resin

Drying resin prevents bubbles from forming during the molding of plastics, but certain hygroscopic substances are constantly attracted to moisture molecules in the air. Keeping moisture out of these resins is a challenge that requires special equipment, quick work and vigilance. Amateurs do not have the skills or tools necessary to protect polarized resins from continual moisture penetration. Normal plastic wrap or plastic bags are semi-porous and will allow air penetration to re-introduce moisture into dried resins, so they are ineffective means of storage.

Polymer dryer
Dessicant container
Vacuum-sealed barrier container

Instructions

- 1
  Connect a dessicant container with a molecular sieve to the polymer dryer.
- 2
  Place resin in the polymer dryer and set the temperature above 212 degrees Fahrenheit. If the dryer is set any lower, it will not maintain an environment that can resist the attraction between polymer molecules and moisture molecules in the dryer.
- 3
  Turn on the dessicant canister so it will pull moisture from the air in the dryer to keep the resin dry.
- 4
  Process and store the resin in a vacuum-sealed barrier container within 30 minutes of removing the resin from the dryer.
- 5
  Keep the vacuum-sealed bag closed as long as you need to prevent moisture accumulation. Exposure to ambient air will result in immediate attraction between air and resin molecules and the resin will need to be re-dried.

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