 Injection Moulding - Engineering Materials
GBRacing recommends using LONG GLASS fibre nylon 6.6 based materials across its range of products.You can clearly see from the pellet comparison picture on the left, that the smaller pellets of short glass fibered nylon materials, are 4 to 5 times shorter than the larger LONG GLASS fibred nylon pellets. The grade of material that we commonly use is LGFN 60%.
After processing the Long glass fibres are 10-20 times greater in length than conventional short glass fibres, providing:
Greater than 100% improved impact resistance at any temperature, plus high stiffness;
Outstanding fatigue performance;
Low warpage and good dimensional stability.
The long fibres absorb more energy before and after fracture initiates. Fracture crack lines are forced around the fibre ends, resulting in a limited fracture area. Injection moulded products offer additional built in strength and flexibility compared to conventional machined plastics.
Not only are the Long Glass Nylon 6.6 compounds used for exceptional impact resistance but are tailored to satisfy the need for light but durable die-cast metal replacement materials.
They offer an extremely cost-effective alternative to Carbon fibre products. The current world shortage of carbon fibre has resulted in very high raw material costs, and carbon fibre products are extremely labour intensive to manufacture.
Our choice of engineering materials are based upon our experience and chart statistics as shown below. Type/Grade | Material | Tensile Strength (MPa) | Impact Strength, Izod notched (J/m) | Acetal Base Resin | Delrin / Acetal | 60 | 80 | Acetal 30% | Delrin/Acetal Short Glass Fibre 30% | 110 | 72 | ABS Base Resin | Acrylonitrile Butadiene Styrene | 46 | 267 | ABS 30% | ABS Short Glass Fibre 30% | 97 | 64 | | SGFN 30% | Nylon 6.6 Short Glass Fibre 30% | 159 | 80 | | SGFN 60% | Nylon 6.6 Short Glass Fibre 60% | 207 | 139 | | CFN 60% | Nylon 6.6 CARBON FIBRE 60% | 221 | 69 | | LGFN 60% | Nylon 6.6 LONG GLASS FIBRE 60% | 276 | 481 |
Bolt Specification Our proven Bolt choice for Frame sliders is A2 Stainless Steel, chosen for it's Elastic Modulus, allowing the bolt to bend if necessary. For Secondary Engine Covers our Socket Cap Head bolts are A2 Stainless steel and for our Hex Head Bolts are Class 12.9 Steel, chosen for the proven durability and tensile strength. With the 12.9 Steel bolts a separate de-embrittlement process is added after plating to reduce bolt shearing. The 12.9 Steel bolts, washers and lock nuts are supplied in Bright Zinc Plate (BZP). The A2 Stainless Steel bolts are supplied in a bright finish. Titanium bolts are also available for all our products.
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