Reference Target Placement for Flexible Plastic Parts
Position reference targets on flexible plastic parts at high-stiffness rib intersections using explicit 3-2-1 restraint forces to eliminate gravity sag and inspection disputes.
TPE Durometer
Meaning
Hardness measurements define the resistance of thermoplastic elastomers to permanent indentation by a standardized steel indenter. A tpe durometer value is a primary specification for soft-touch components, seals and gaskets. The scale used depends on the stiffness of the material, with the Shore A scale being the most common for flexible resins.
Material Softness
Resistance to compression determines how the part feels and performs in its application. A lower number indicates a softer, more rubber-like material, while a higher number indicates a stiffer plastic. This property is tuned by adjusting the oil content or the polymer blend in the resin.
Compression Set
Ability of the material to return to its original shape after a load is removed is related to its hardness. Soft materials may show more permanent deformation over time, especially at higher temperatures. Engineers must balance the required feel with the long-term sealing performance.
Shore Scale
Standardized testing uses different probe shapes and spring pressures for different material classes. The Shore A scale uses a blunt probe for soft elastomers, while the Shore D scale uses a sharp point for harder plastics. Results are typically measured after a specific delay, such as fifteen seconds, to account for material creep.