Additional Technical Information

• A clean, highly polished, chrome plated mold is recommended. Use a mold release such as Carnauba Wax, being careful to coat the entire surface including the sprue bushing. After several shots wipe off the excessive mold release using a clean, soft cloth.
• The orifice size of the nozzle should be 1 mm (1/32”) less than the sprue bushing orifice. This will allow material to be pulled from the nozzle, which helps minimize nozzle freeze off. The nozzle and sprue orifice should be the same radius, to provide a leak free shut off. In some cases, it may be necessary to have a smaller radius on the nozzle, to reduce the heat transfer from the sprue, which may be causing nozzle freeze off.
• A tapered, highly polished D2 steel sprue bushing will provide easy release of the sprue from the sprue bushing.
• The shot weight (part & runner volume) should be between 20% and 80% of the barrel capacity of the injection press. A Thermoset injection screw and barrel can be used to process these molding materials. A Thermoset screw is one with a 12:1 L/D (length/diameter) Ratio, a 1:1 Compression Ratio and a 40° included angle on the tip. Another method of processing, is to force the material out of the barrel with a plunger, also called a ram.
• Adding a cushion of 3 mm (1/8”) and switching to secondary or holding pressure at 6 mm – 10 mm (1/4” - 3/8”) before the screw bottoms out, will help maintain a part density that maximizes physical and electrical properties.