Pearlthane D11T85UV and D11T93 thermoplastic polyurethanes (TPUs) from Merquinsa NA Inc., Sparta, N.J., reportedly have met or exceeded North American Tier 1 automotive specs for gear-shift knobs and spring insulators. The Pearlthane D11T85UV TPU line, based on a proprietary polycaprolactone technology, is reportedly easily overmolded in typical two-shot injection-molding applications. They also sport good wearability and scratch resistance.
The special UV resistance and colorability of this 85A Shore A TPU makes it suitable for demanding two-shot molding automotive-interior applications. It adheres well to a wide range of polar substrates such as ABS and PC. Currently, this TPE can be overmolded onto a variety of rigid substrates to provide a "leatherlike" feel, as well as resist wear and abrasion. The material ships in clear pellet form for coloring.
Pearlthane D11T93 resists oil, grease, and abrasion. Its high-temperature and hydrolysis performance versus standard polyester TPUs make it an option for elastomeric underhood applications. Additional grades will be available later this year.
Merquinsa NA Inc., (973) 362-1280, www.merquinsa.com
|Shore A hardness||ASTM D-2240||93||86|
|Tensile strength, kpsi||ASTM D-412||5.8||5.8|
|Elongation @ break, %||ASTM D-412||525||600|
|Modulus @100 % elongation, kpsi||ASTM D-412||1.23||0.87|
|Modulus @300 % elongation, kpsi||ASTM D-412 2.5||1.45|
|Tear strength, lb/in.||ASTM D-624 (Die C)||685||515|
|Compression set (70 hr @ 73° F), %||ASTM D-395||20||20|
|Compression set ( 24 hr @ 158° F), %||ASTM D-395||29||35|
|Moisture content %||MQSA 44||<0.05||<0.1|