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Material Preparation

Prior to use, Dow Corning gels and elastomers should be kept sealed against dirt and excess moisture. Any contaminants that find their way into the gel prior to use will most likely find their way into your parts.

Dow Corning gels and elastomers can be dispensed manually or using one of the many different types of meter mix equipment available. Typically the two components are of matched viscosity and are readily mixed with a static mixer.

When manually mixing and dispensing, a thorough mix is required. Best practices suggest putting the B part into the mixing dish first.A flat spatula or mixing tool should be used as it gives you the ability to scrape the bottom and sides of the dish. After the A part is added a good thorough mixing is required.
Many of Dow Corning’s gels and elastomers are available in color-coded parts.  When mixed, the resulting color should be uniform.  Streaks are evidence of inadequate mixing. 

A good practice when hand mixing is to time your mixing, cure the sample and test some of the physical properties (hardness or durometer are usually good indicators) against the data sheet. If the properties are close, then you have probably mixed thoroughly. If the properties are significantly different, a longer mix time is warranted.

During the mixing process, especially in hand mix applications; air may be introduced into the gel or encapsulant. Entrapped air in the mixture can be removed by using 28 inches (0.9 bar) of vacuum.The container should be one fourth full or less to avoid overflowing, as large bubbles will be formed almost immediately.These should be collapsed by introducing atmospheric pressure and then continuing the vacuum.

The time for deairing to happen will be dependant on the amount of air in the material and the viscosity of the material.  In deairing high viscosity encapsulants, it may be necessary to release and reapply the vacuum several times to break the bubbles that form.

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  1. Gel and Encapsulant Processing - General

  2. Gel and Encapsulant Processing - General

  3. Substrate Preparation

  4. Material Preparation

  5. Applying Gel or Encapsulant

  6. Curing

  7. Cure Inhibition

  8. Where Does Inhibition Occur

  9. Repairing Gels or Encapsulants

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