Page 246 - Engineering Plastics Handbook

210 Engineering Plastics

powder coating process. They exhibit excellent performance levels in
adhesion, high impact, chemical resistance, and 374, 347, and 352°F
(190, 175, and 178°C) HDT at 66 psi (0.45 MPa), respectively.
Noryl GTX 4110: This is a 10% glass-reinforced, flame-retardant, con-
ductive grade. It uses a nonbrominated, nonchlorinated, nonred phos-
phorous flame retardant, allowing for ECO-label compliance. It offers
V-0 performance at 0.118 in (3.00 mm) and 5 VA at 0.098 in (2.5 mm).
The HDT at 66 psi (0.45 MPa) is 455°F (235°C).

Extrusion and blow-molding grades. These are based on polyamide 6
and are designed for high melt strength to facilitate extrusion and blow
molding. These grades and key features are

Noryl GTX 626: 355°F (179°C) HDT at 66 psi (0.45 MPa); extrusion
and blow-molding applications
Noryl GTX 628: 363°F (184°C) HDT at 66 psi (0.45 MPa); blow-mold-
ing applications

PPE/Polypropylene Alloys
The newest PPE alloy combines PPE with polypropylene (PP). PPE and
PP polymers are incompatible with each other. However, PPE/PP alloys
are prepared using patent-pending compatibilization technology. PPE/PP
alloys have excellent chemical resistance, low density, good dimensional
stability, negligible moisture absorption, less creep than PP or ABS, cold-
temperature impact, excellent processability, higher heat capability than
PP, and a much wider stiffness/impact profile. Moreover, PPE/PP resins
have better melt strength than PP and ABS, which facilitates extrusion
and thermoforming operations. In addition, PPE/PP alloys are “regrind-
friendly” with other polypropylene-based products.
In 2001, PPE/PP alloys were commercialized under the Noryl PPX des-
ignation. This new alloy creates a market niche between engineering ther-
moplastics and high-performance polyolefins. PPE/PP alloys offer product
designers materials that fill the gap between the basic properties of high-
end polyolefins and the stronger performance characteristics and attrib-
utes of engineering thermoplastics.
PPE/PP alloys offer a much wider stiffness/impact profile vis-à-vis PP-
based thermoplastic polyolefin (TPO), which is maintained over a broader
temperature range. Compared to glass-reinforced polypropylene, PPE/PP
opens the performance envelope to include greater rigidity at elevated
temperatures as well as better creep and scratch resistance.
Application areas for PPE/PP resins include performance packag-
ing, automotive, transportation, lawn and garden tools, and fluid engi-
neering. For example, in automotive bumper fascias PPE/PP offers