Page 247 - Engineering Plastics Handbook

Polyphenylene Ether (PPE) Blends and Alloys 211

low-temperature ductility after painting. Its higher modulus (30 to
50% greater than TPO) can allow for thinner walls and reduced mate-
rial usage, and typically faster molding cycles. In addition, the high
elongation, low specific gravity, and long-term heat resistance provide
the opportunity to consolidate parts through multifunctional front-end
design, which can result in significant weight and cost reductions.
In food service applications, PPE/PP resin can extend the life of retort
trays and lower system costs because of its low-temperature toughness
and high heat resistance, durability, cleanliness, and peel performance.

PPE/Polypropylene Grades
The Noryl PPX resin portfolio presently includes unfilled and filled
grades. Representative properties of unfilled PPE/PP grades appear in
Table 9.12. Key features of these grades include

Noryl PPX 7110: Designed for extrusion and blow molding
Noryl PPX 7112: Designed for extrusion and offers high impact and
good paint adhesion
Noryl PPX 7115: Designed for extrusion and offers higher heat resist-
ance and high impact and is NSF Standard 61 listed (restrictions apply)
Noryl PPX 7200: Designed for injection molding
Representative properties of reinforced PPE/PP grades appear in
Table 9.13. Glass-reinforced grades and key features include

Noryl PPX 615: Designed with 15% glass-reinforced for injection
molding
Noryl PPX 630: Designed with 30% glass-reinforced and is NSF
Standard 61 listed (restrictions apply)
Noryl PPX 640: Designed with 40% glass-reinforced and is NSF
Standard 61 listed (restrictions apply)

PPE in Thermoset Resins
PPE has been used in thermosets. In particular, PPE is used in the resin
formulations to make GETEK* copper-clad laminates for high-end, high-
performance printed wiring boards. GETEK laminates were developed
by GE Electromaterials. Epoxy-PPE based laminates were commer-
cialized in 1991 [28]. In 2002, PPE-cyanate ester based laminates were

*GETEK is a trademark of Cookson Electronics.