Hardness
A measurement of the resistance to penetration of a rubber sample by an indenter. High values indicate harder materials while low values indicate softer materials. See also Durometer, IRHD, and Shore A
HDPE
High-density polyethylene
HDT
Heat-deflection test
Heat deflection temperature
The temperature at which a standard plastic test bar deflects 0.010 in. (.254mm) under a stated load of either 66 or 264 psi (4.55 or 18.2 Bar)
Heat Sealing
A method of joining plastic parts or films by simultaneous application of heat and pressure to areas in contact. Heat may be supplied by conduction or dielectrically
Hermetic Seal
An airtight seal
HIP
High-impact polystyrene
HLMI
High-load melt index
HM
High-modulus
HMC
High-strength molding compound
HME
High-vinyl modified epoxy
HMW
High molecular weight
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