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Epoxy resin is typically used post-1930s and is an indication of modern conservation work. Generally, epoxy is very hard, but unlike shellac it is not brittle. The color of epoxy resin can range from yellow/green to a dark yellow/brown. Yellowing of the resin is an indication of aging.
Silicones are usually very thick (high viscosity), and must be vacuum degassed prior to pouring, to minimize bubble entrapment. If making a brush-on rubber mold, the curing time factor between coats is long (longer than urethanes or polysulfides, shorter than latex). Silicone components (A+B) must be mixed accurately by weight (scale required ...
Epoxy systems are used in industrial tooling applications to produce molds, master models, laminates, castings, fixtures, and other industrial production aids. This "plastic tooling" replaces metal, wood and other traditional materials, and generally improves the efficiency and either lowers the overall cost or shortens the lead-time for many ...
Plaster and other chemical curing materials such as concrete and plastic resin may be cast using single-use waste molds as noted above, multiple-use 'piece' molds, or molds made of small rigid pieces or of flexible material such as latex rubber (which is in turn supported by an exterior mold). When casting plaster or concrete, the material ...
Specialist equipment can enable closed molds to be filled whilst under vacuum, a process known as resin vacuum casting, where air and gas bubbles are completely removed from the cast part. Pressure and/or centrifugal force can be used to help push the liquid resin into all details of the mold. The mold can also be vibrated to expel bubbles.
When addressing minor repairs and minimal cleaning of objects containing bone, antler, or horn, there are some methods/products that are avoided. [17] Liquid-based cleaners or detergents used to clean surface dirt and dust can damage the objects. Over-the-counter adhesives used to repair cracks and breaks can stain and become brittle over time.
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