Glass-fibre-reinforced grades

The short-term modulus or tensile strength retention at 120°C as a percentage of the value at 20°C is roughly 30-50% for a few glass fibre reinforced grades. 

Figure 4.84 displays two examples of modulus retention versus temperature for a neat general-purpose PPE/PS and a 30% glass fibre reinforced grade. 

Neat and glass fibre reinforced grades can be used for tribological applications with rather high coefficients of friction in a range from 0.3 up to 0.5. 

ETFEs are inherently insensitive to moisture and UV. Stabilization is not needed. However, glass fibre reinforced grades can be altered by long outdoor exposures. 

The short glass fibre reinforced grades are used for all sorts of injected parts. 

The mat and continuous glass fibre reinforced grades have specific uses ... 

The cost is roughly 3 up to 4 per kg for neat or glass fibre reinforced grades. 

Glass-Fibre Reinforced Grades for Injection Molding, Rilsan s Technical Data Sheet No. 3, Rilsan Corporation, Glen Rock, NJ, October 1974. 

Table 3.1 shows continuous use temperatures for engineering and high performance polymers. For comparative purposes, 30% glass fibre-reinforced grades have been selected. PEEK has the highest continuous use temperature of up to 260 C, followed closely by liquid crystal polymers. Other high performance polymers are polyphthalamide (PPA), polyamideimide (PAI), polyarylimide, polyphenylene sulfone (PPSU), polyphenylene sulfide (PPS), polyetherimide (PEI), polysulfone (PSU), polyethersulfone (PES). 

Table 3.5 presents a comparison of the performance properties of unfilled, 30% glass fibre-reinforced and 30% long glass fibre-reinforced grades of polycarbonate. 

BASF range of PBT polymers and compounds are sold under the Ultradur trade name. Glass fibre-reinforced grades made from PBT and ASA (Ultradur S) with low warpage are also available. 

Crystalline grades have poor processibility, poor impact resistance and low HDT Amorphous PET gives better processing but lower stiffness and dimensional stability glass fibre reinforced grades prone to warpage process controls necessary to achieve desired crystallinity. 

---