First, what is of PFA ?
PFA English name: Polyfluoroalkoxy, Chinese name: tetrafluoroethylene - perfluoroalkoxy vinyl ether copolymer (also known as: perfluoroalkyl compounds soluble polytetrafluoroethylene ). PFA resin is relatively new melt-processablefluoroplastic , PFA, FEP , the PTFE similar chemical properties, but FEP can only be used at less than 200 degrees, PTFE can not be injection molded. [This resource was first released by the Chinese fluorine plastic mesh, please indicate the source.]
1, specific gravity: 2.13-2.167 g / cc
2, mold shrinkage: 3.1-7.7%
3, molding temperature: 350-400 ℃
4, PFA melting point of about 580F, a density of 2.13- 2.16g / cc (g / cc).
Two, PFA characteristics and main uses
Commonly known as PFA fusible PTFE, various properties of fluorine plastic crown, and FEP similar purposes. Widely used in the semiconductor industry, as well as medical, chemical corrosion, automotive and other fields.
PFA product forms are granulated product for molding and extrusion for rotational molding and powder coating products; semi-finished products with film, plates, rods and tubing. US market distribution of PFA resins DUPOut company's Teflon brand, Daikin's Neoflon brand, Ansimont company Hthen brand, HOechst Celanese's Hostafl card.
1, PFA's main purposes:
①. Suitable for production of corrosion-resistant parts, less wear resistant parts, seals , insulation parts and medical equipment parts.
②. High temperature wire and cable insulation, anti-corrosion equipment, sealing materials, valve bushing, and chemical containers.
2, moldability ①. Crystalline material, moisture absorption is small. Can be generally obtained thermoplastic processing methods have to be processed into products.
②. Poor mobility, easily decomposed when the corrosive gas decomposition. Should strictly control the molding temperature should not exceed 475 degrees, the mold should be heated to 150-200 degrees, gating system flow resistance should be small.
③. Translucent pellets, injection molding, extrusion molding. Molding temperature of 350-400 degrees, 475 degrees or more likely to cause discoloration or air bubbles. And note that the release would be more difficult.
④. The molten material due to metal corrosion, long-term production, chrome plating mold needs.