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Fluorine plastic lining corrosion-resistant valve is PTFE resin (or profile processed) using molded (or inlaid) method placed on the inner wall of the steel or iron valve pressure parts (the same method is suitable for all types of pressure vessels And piping accessories lining) or the inner surface of the valve parts, the use of its unique properties in the anti-corrosive media made into various types of valves and pressure vessels. PTFE commonly known as "plastic king" is the United States DUPOUT CO., LTD first developed in 1938, 1949, industrial production, from the industrial point of view of more than 50 years of history, but truly its widely used in the valve industry The time is not long. In the corrosion-resistant materials, PTFE has incomparable excellent performance, in addition to molten alkali metals, fluorine and aromatic hydrocarbons, in various concentrations of hydrochloric acid, sulfuric acid, nitric acid, aqua regia, organic acids, strong oxidants, Concentrated, dilute acid alternating, alkali alternating with a variety of organic solvents showed a random reaction, the PTFE lining the valve wall, both to overcome the shortcomings of low strength PTFE material, but also to solve the valve body material resistance Poor corrosion performance and high cost. In addition, polytetrafluoroethylene in addition to excellent chemical stability, its antifouling, anti-sticking, static and dynamic friction coefficient is very small and similar, anti-friction lubrication performance is good, as the valve opening and closing parts of the seal Vice, can reduce the friction between the sealing surface, reducing the valve operating torque, improve product life, in the oil, printing and dyeing, chemical, food, medicine and other industries are widely used. Fluoroplastics lining materials such as PTEE (F4), RPTFE (RF4), FEP (F46), PCFE (F3), PFA (soluble F4), PVDF (F2) PO, PE, PP and PVC lining materials to meet the needs of a variety of operating parameters. Fluoroplastic linings for valves and pipe fittings Performance specifications for lined meterial Name of units → PTFE Polyvinylidene fluoride Polyvinylidene fluoride Polyvinyl fluoride Soluble PTFE abbreviation → PTFE PCTFE PVDF FEP PFA Code → F4 F3 F2 F46 * FA Physical properties Specific gravity rg / cm3 2.1 ~ 2.2 2.1 ~ 2.2 1.76 2.1 ~ 2.2 2.1 ~ 2.2 Water absorption% 0.001 ~ 0.005 ≤0.005 0.04 ≤0.01 ≤0.01 Shrinkage% 1 ~ 5 1 ~ 2.5 2.0 2 to 5 1 to 5 Expansion coefficient 10-5 / k 10 to 12 4.5 to 7.0 8.5 to 15.3 8.3 to 10.5 8 to 12 Brittleness temperature T1 ° C -180 to -195 -80 to -195 -62 -260 -180 to- -195 Continuous heat resistance T2 ℃ 260 120 ~ 260 Recommended temperature T3 * ℃ ≤180 ≤120 ≤100 ≤150 ≤180 * According to the temperature-pressure level curve of fluorine plastic lined on the inner wall of steel pressure parts, it is recommended Users in this temperature range to choose the most suitable temperature of the valve. Another recommended temperature: PE ≤ 100 ℃, PP ≤ 100 ℃, PVC ≤ 55 ℃. Mechanical properties Hardness Unit D50 ~ 65 D74 ~ 78 D80 (R45) D50 ~ 65 Friction coefficient f - 0.06 0.3 ~ 0.4 0.14 ~ 0.17 0.06 ~ 0.11 0.06 ~ 0.11 Tensile strength бb MPa 13.7 ~ 24.5 31.3 ~ 39.2 45 ~ 48.3 20.2 ~ 24.5 14 ~ 28 Bending strength бw MPa 10.7 ~ 13.7 53.9 ~ 68.6 - - 15 ~ 28 Compressive strength бy MPa 111 80.3 ~ 50.9 68.6 - 111 Impact strength бk KJ /? 16 12.7 ~ 16.6 19.7 Continuous 1+ Limiting extension Δι% 250 ~ 350 30 ~ 190 30 ~ 300 250 ~ 270 300 ~ 500 Breakdown Voltage V KVmn 25 ~ 40 19.7 10.2 40 25 ~ 40 Processing Properties Molding Forming Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent. Performance Medium Concentration Temperature ℃ PTFE PCTFE PCDF FEP PFA Sulfuric acid 10 ~ 98 Normal temperature ~ 100 AA ~ BA ~ BAA Nitric acid 3 ~ 98 Normal temperature ~ 100 AAAAA Hydrochloric acid 10 ~ 38 Normal temperature ~ 100 AAAAA Acetic acid 10 ~ 100 Normal temperature ~ 100 AA ~ BA ~ BAA硌 Acid 50 ~ 100 Normal temperature ~ 70 AA ~ BA ~ BAA Phosphoric acid 50 ~ 85 Normal temperature ~ 100 A ~ BAAA ~ BA ~ B Trichloromethane 100 Normal temperature CDDCC Copper sulfate 15 Normal temperature ABBAA Diethyl ether 100 Normal temperature BCCAB Ethyl acetate 100 Normal temperature BCCCB Gasoline 100 AAAAA peroxide at room temperature 3 ~ 30 Normal temperature AA ~ BA ~ BAA Aqua Regia - Normal temperature AAAAA Nitrobenzene 100 Normal temperature ABBAA Caustic 10 ~ 50 Normal temperature ~ 100 AA ~ BA ~ BAA Sodium hypochlorite - 70 AAAAA Hydrochloric acid 40 ~ 99 -10 ~ 30 A ~ BBBA ~ BA ~ B Oleum 20 Normal temperature ABBAA Acrylonitrile - Normal temperature BCCBB Aniline 100 Normal temperature BBBBB Benzene 100 Normal temperature BCCCB Butyl acetate 100 Normal temperature BCCBB Carbon tetrachloride Reagent Normal temperature BCCBB Note: A, B, C and D represent Corrosion resistance, respectively, on behalf of the four grades of excellent, good, and poor performance of the project unit Name → PTFE Polyvinylidene fluoride Polyvinylidene fluoride Perfluoroethylene soluble polytetrafluoroethylene abbreviation → PTFE PCTFE PVDF FEP PFA Code F4 F3 F2 F46 * FA Physical Properties Specific gravity rg / cm3 2.1 ~ 2.2 2.1 ~ 2.2 1.76 2.1 ~ 2.2 2.1 ~ 2.2 Water Absorption% 0.001 ~ 0.005 ≤0.005 0.04 ≤0.01 ≤0.01 Shrinkage% 1 ~ 5 1 ~ 2.5 2.0 2 ~ 5 1 ~ 5 Expansion coefficient 10-5 / k 10 ~ 12 4.5 ~ 7.0 8.5 ~ 15.3 8.3 ~ 10.5 8 ~ 12 Brittleness temperature T1 ℃ -180 ~ -195 -80 ~ -195 -62 -260 - 180 ~ -195 Continuous heat resistance T2 ℃ 260 120 ~ 260 Recommended temperature T3 * ℃ ≤180 ≤120 ≤100 ≤150 ≤180 * According to the temperature-pressure curve of fluoroplastic lined on the inner wall of steel pressure-bearing member, it is recommended that users choose the most suitable temperature of the valve in this temperature range. Another recommended temperature: PE ≤ 100 ℃, PP ≤ 100 ℃, PVC ≤ 55 ℃. Hardness unit D50-65 D74-78 D80 (R45) D50-65 Friction coefficient f - 0.06 0.3-0.4 0.14-0.17 0.06-0.11 0.06-0.11 Tensile strength бb MPa 13.7-24.5 31.3-39.2 45-48.3 20.2-24.5 14 ~ 28 Bending strength бw MPa 10.7 ~ 13.7 53.9 ~ 68.6 - - 15 ~ 28 Compressive strength бy MPa 111 80.3 ~ 50.9 68.6 - 111 Impact strength бk KJ /? 16 12.7 ~ 16.6 19.7 Continuous 1+ Limit extension Δι% 250 ~ 350 30 ~ 190 30 ~ 300 250 ~ 270 300 ~ 500 Breakdown Voltage V KVmn 25 ~ 40 19.7 10.2 40 25 ~ 40 Molding Superiority Excellent Excellent Injection - Excellent Excellent Excellent Excellent Excellent Laminating Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Concentration Temperature ℃ PTFE PCTFE PCDF FEP PFA Sulfuric acid 10 ~ 98 Normal temperature ~ 100 AA ~ BA ~ BAA Nitric acid 3 ~ 98 Normal temperature ~ 100 AAAAA Hydrochloric acid 10 ~ 38 Normal temperature ~ 100 AAAAA Acetic acid 10 ~ 100 Normal temperature ~ 100 AA ~ BA ~ BAA Acid 50 ~ 70 AA ~ BA ~ BAA Phosphoric acid 50 ~ 85 Normal temperature ~ 100 A ~ BAAA ~ BA ~ B Trichloromethane 100 Normal temperature CDDCC Copper sulfate 15 Normal temperature ABBAA Diethyl ether 100 Normal temperature BCCAB Ethyl acetate 100 Normal temperature BCCCB Gasoline 100 Normal temperature AAAAA Hydrogen peroxide 3 ~ 30 room temperature AA ~ BA ~ BAA aqua regia - Room temperature AAAAA Nitrobenzene 100 Room temperature ABBAA Caustic 10 ~ 50 Room temperature ~ 100 AA ~ BA ~ BAA Sodium hypochlorite - 70 AAAAA Hydrogenol 40 ~ 99 -10 ~ 30 A ~ BBBA ~ BA ~ B Oleum 20 Normal temperature ABBAA Acrylonitrile - Room temperature BCCBB Aniline 100 Room temperature BBBBB Benzene 100 Normal temperature BCCCB Butyl acetate 100 Normal temperature BCCBB Carbon tetrachloride Reagent Normal temperature BCCBB
Graphite crucibles have good thermal conductivity and high temperature resistance. During high-temperature use, their coefficient of thermal expansion is small, and they have certain strain resistance to rapid heating and cooling. Strong corrosion resistance to acidic and alkaline solutions, with excellent chemical stability.
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