New Materials for Vacuum Chambers in High Energy Physics
Materials for use in vacuum are materials showing very low rate of outgassing in vacuum, and, where applicable, tolerant to the bake-out temperatures. The requirements grow increasingly stringent with the desired degree of vacuum achievable in the vacuum chamber. The materials can produce gas by several mechanisms.
Extruded acrylic vacuum forms better then the cast. Tends to be brittle and temperature sensitive . Vivak ® PETG - Co-Polyester (clear) Easy forming at low temps. Forms to a high definition . HIPS - High Impact Polystyrene (white) Easy forming. Forms to a high definition. Most widely used material . PC – Polycarbonate (clear)
9 · Vacuum Forming Material Selection Guide. Dairy & Medical Parts, Point of Sale. Chemical Tanks, Enclosures, Food Containers, Luggage, Medical Applications and Toys. PVC, 1.37 g/cm³ Medium - high strength, good transparency in thinner gauges, good fire retardant & chemical properties.
Vacuum Forming - Commonly Used Materials for Heavy Gauge Vacuum Forming: ABS. PC/ABS. HDPE. TPO. HIPS. PVC/Acrylic.
vacuum forming materials used,
There are many different types of plastics that are used in vacuum forming and these are some of the more common ones: Acrylonitrile Butadiene Styrene (ABS) Acrylic - Perspex (PMMA) Co-Polyester (PETG) Polystyrene (HIPS) Polycarbonate (PC / LEXAN / MAKROLON) Polypropylene (PP) Polyethelene (HDPE)
Vacuum forming tools used for prototyping can be made from a variety of materials. The material choice will depend on the application and will vary in cost. At Kal Plastics, we use wood for prototyping as much as possible because it is the least expensive.
Vacuum. Once the material is suitably pre-stretched a vacuum can be applied to assist in forming the sheet. A dry vane vacuum pump is used to draw the air trapped between the sheet and the mould. The vacuum pump should be capable of maintaining a differential pressure of approximately 27" mercury.