is normally classified as one of two generic types:
Thermosets, which account for approximately 15% of the market, can be melted and
formed only once. This occurs because the original liquid state of thermoset resins
requires heat to cure, much like that of a hard boiled egg.
Thermoplastics Thermoplastic materials account for roughly 85% of the total market and
are characterized by the ability to be repeatedly melted, formed, re-melted, and
reformed. This can be accomplished because thermoplastic resins are cured by air
or water cooling. There are two types of thermoplastics: hygroscopic and non-hygroscopic.
resins collect moisture on the inside of the pellet; therefore, moisture removal
requires both dry air and heat.
2. Non-hygroscopic resins collect moisture on the pellet surface which is removed
with warm air.