Master Molded Products, LLC. has experience and expertise in molding a wide range of commodity and engineering grade thermplastic resins and thermoplastic elastomers.
Specialty materials feature resins systems with a wide range of additives and reinforcements to meet your design and performance criteria.
Polymers can be divided into two categories according to their molecular structure — semi-crystalline and amorphous.
|Mold Flow Ease||*|
Amorphous resins have randomly ordered molecular structure, do not have a sharp melt point and soften gradually as the temperature rises.
Amorphous materials change viscosity when heated, but do not flow as easily as semi-crystalline materials. They exhibit isotropic flow and shrink uniformly in both the direction of flow and transverse to the flow. resulting in lower mold shrinkage and less tendency to warp as compared to semi-crystalline materials.
Amorphous resins exhibit rapid strength falloff above their glass transition temperatures (Tg).
Semi-crystalline materials have a highly structured molecular structure and sharp melting points. As temperature increases, semi-crystalline materials remain solid until reaching a point where they rapidly change into a low viscosity liquid.
Semi-crystalline resins are anistropic, that is, they shrink less in the direction of flow compared to transverse to flow.
Semi-crystalline resins typically have excellent chemical resistance due to the lattice-like molecular structure. Semi-crystalline show significant improvement in their heat deflection temperature (the temperature at which they deform under a given load) when reinforced and maintain strength and stiffness well beyond their glass transition temperatures (Tg).
CPVC Chlorinated Polyvinyl Chloride
ECTFE Ethylene Chlorotrifluroethylene
ETFE Ethylene Tetrafluoroethylene
FEP Fluorinated Ethylene Propylene
HDPE High Density Polyethylene
HIPS High Impact Polystyrene
LDPE Low Density Polyethylene
LLDPE Linear Low Density Polyethylene
PBT Polybutylene Terephthalate
PET (PETE) Polyethyleneterephthalate
PETG Polyethylene Terephthalate with Glycol modifier
PPO Polyphenylene oxide
PVC Polyvinyl Chloride
PVDF Polyvinylidene Fluoride
UHMW PE Ultra High Molecular Weight Polyethylene