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ACRYLICS (Castable) - Castable acrylics are easy to use and are very robust.

 The main advantage of mounting with castable acrylics is the fast curing time. Depending upon the mixing ratio,

castable acrylic mounts are typically ready to use within 8-15 minutes. Also unlike epoxy resins,

the ratio of the various acrylic parts (powder to liquid) can be altered by up to 25% with no adverse effect to the final properties of the mount.

This is because both the liquid and powder are acrylics with various additives

and curing agents. By varying the ratio of the liquid to powder, the curing time and viscosity can be altered.

Note: the powder contains a catalyst that reacts with the liquid hardener to start the curing process.

 Fillers are added to increase hardness and to reduce shrinkage.

Characteristics of Acrylics

• Rapid mounting
• Very repeatable and consistent
• Moderate shrinkage
• Good hardness
• Semi-transparent
• High odor

TIP: Acrylics can be submerged into a water bath during curing.

       This reduces the exotherm heat and thus reduces the shrinkage of the mount at the specimen interface.

       A secondary advantage is that the water absorbs the odor.

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