The effect of varying levels of Methyl Ethyl Ketone Peroxide cure initiator on the performance of cast polymer resins is investigated. Resin and initiator suppliers routinely recommend initiator levels of 0.75 - 2.5% based on resin. This recommendation may not always be followed due to shop temperatures that cause the resin to react too quickly or too slowly. This study investigates the effects of initiator level including those outside the recommended extremes. Physical properties, extent of cure, and degree of yellowing were measured on castings of a standard cultured marble resin cured with initiator levels ranging from 0.3% to 5.0%. The results clearly show the impact of deviating from the recommended range.
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