1、AEROSPACE INFORMATION REPORT AIR5693 Issued 2004-11 Reaffirmed 2014-10 Compatibility of PTFE Hose Assemblies With Typical Fluids Found in Aerospace Applications RATIONALE AIR5693 has been reaffirmed to comply with the SAE five-year review policy. _ SAE Technical Standards Board Rules provide that: “
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5、icesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AIR5693 FOREWORD AIR5693 is presented as a resource that lists the compatibility of several common fluids found in aerospace systems t
6、hat may come in contact with polytetraflouroethylene (PTFE) lined hose assemblies. This document is presented for information to the aerospace engineering community. It is incumbent upon the project engineer to confirm fluid compatible under all operational conditions. TABLE OF CONTENTS 1. SCOPE 3 1
7、.1 Purpose3 2. APPLICABLE DOCUMENTS.3 2.1 SAE Publications3 2.2 ASTM Publications.5 2.3 U.S. Government Publications .5 2.4 Other References.6 3. METALS.6 4. POLYTETRAFLUOROETHYLENE (PTFE) TUBE.7 5. SILICONE FIRESLEEVE .8 6. PARA-ARAMID YARN REINFORCED HOSE AND HOSE ASSEMBLIES8 7. OTHER COVER AND RE
8、INFORCEMENT YARNS USED TO BRAID HOSE LENGTHS.9 8. SEVERAL TYPES OF FUELS USED IN AEROSPACE APPLICATIONS .9 9. SEVERAL TYPES OF LUBRICATING FLUIDS USED IN AEROSPACE APPLICATIONS10 10. SEVERAL TYPES OF HYDRAULIC FLUIDS USED IN AEROSPACE APPLICATIONS10 11. SEVERAL TYPES OF STANDARD TEST FLUIDS USED IN
9、AEROSPACE APPLICATIONS .11 12. SEVERAL TYPES OF CLEANING FLUIDS USED IN AEROSPACE APPLICATIONS11 13. SEVERAL TYPES OF DE-ICING FLUIDS USED IN AEROSPACE APPLICATIONS12 14. SEVERAL TYPES OF WATER DISPLACEMENT FLUIDS USED IN AEROSPACE APPLICATIONS 12 15. SEVERAL TYPES OF FIRE SUPPRESSANT FLUIDS USED IN
10、 AEROSPACE APPLICATIONS 12 16. SEVERAL TYPES OF COOLANT FLUIDS USED IN AEROSPACE APPLICATIONS13 SAE INTERNATIONAL AIR5693 Page 2 of 13_ 1. SCOPE: The scope of this document is limited to the compatibility of typical fluids that may come in contact with PTFE hose assemblies. PTFE hose assemblies may
11、be braided with CRES wire, polyester or para-aramid fibers. Hose assemblies may be equipped with aluminum, CRES, titanium or nickel alloy fittings; and with fire resistant cover materials. All of these constituent materials of PTFE hose assemblies must be compatible with all of the fluids found in a
12、ny particular application. 1.1 Purpose: The purpose of AIR5693 is to provide a reference listing the compatibility between the listed fluids and the common types of materials found in PTFE aerospace hose assemblies. It is incumbant upon the responsible engineer to ensure all of the materials used wi
13、thin their system are compatible. 2. APPLICABLE DOCUMENTS: The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase ord
14、er. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1 SAE Publications: Available from SA
15、E, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AMS-QQ-A-225/ Aluminum Alloy, Bar, Rod and Wire or Special Shapes; Rolled, Drawn or Cold Finished; General Specification for AMS-QQ-A-367 Aluminum Alloy Forgings AMS-QQ-S-763 Steel Bars, Wire, Shapes and Forgings Corrosion Resistant AMS 4117 Alum
16、inum Alloy, Rolled or Cold Finished Bar, Rods and Wire and Flash Welded Rings, 1.0Mg - 0.60Si - 0.28Ci - 0.20Cr, Solution and Precipitation Heat Treated AMS 4127 Aluminum Alloy, Forgings and Rolled or Forged Rings, Solution and Precipitation Heat Treated AMS 4921 Titanium Bar, Wire, Forgings and Rin
17、gs Commercially Pure 70 ksi (483 MPa) Yield Strength SAE INTERNATIONAL AIR5693 Page 3 of 13_ 2.1 (Continued): AMS 4928 Titanium Alloy, Bars, Wire, Forgings and Rings, 6.0Al - 4.0V, Annealed AMS 4965 Titanium Alloy, Bars, Wire, Forgings and Rings, 6.0Al - 4.0V Solution Heat Treated and Aged AMS 5581
18、Nickel Alloy, Corrosion and Heat Resistant, Seamless or Welded Tubing, 61Ni - 21.5Cr - 9.0Mo - 3.7(Cb+Ta) Annealed AMS 5639 Steel, Corrosion Resistant, Bars, Wire, Forgings, Tubing and Rings, 19Cr - 10Ni, Solution Heat Treated AMS 5643 Steel, Corrosion Resistant, Bars, Wire, Forgings, Tubing and Rin
19、gs, 16Cr - 4.0Ni - 0.30(Cb+Ta) 4.0Cu Solution Heat Treated, Precipitation Hardenable AMS 5644 Steel Bars and Forgings, Corrosion Resistant AMS 5645 Steel, Corrosion Resistant, Bars, Wire, Forgings, Tubing and Rings 18Cr - 10Ni - 0.40Ti, Solution Heat Treated AMS 5647 Steel, Corrosion Resistant, Bars
20、, wire, Forgings, Tubing and Rings 19Cr - 9.5Ni Solution Heat Treated AMS 5666 Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, Extrusions and Rings 62Ni - 21.5Cr - 9.0Mo - 3.65(Cb+Ta) Annealed AS604 Hose Assembly, Tetrafluoroethylene, 400F, 3000 psi Hydraulic Heavyweight AS611 Tetrafluor
21、oethylene Hose Assembly Cleaning Method AS614 Hose Assembly, Polytetrafluoroethylene, Metallic Reinforced, 4000 psi, 400F, Heavy Duty, Hydraulic and Pneumatic AS620 Hose Assemblies, Convoluted Polytetrafluoroethylene Metallic Reinforced, High Temperature, Medium Pressure, Aircraft AS1072 Sleeve, Hos
22、e Assembly, Fire Protection AS1227 High Temperature Low Pressure Hose Assembly, Convoluted-, Tetrafluoroethylene-, For Aerospace SAE INTERNATIONAL AIR5693 Page 4 of 13_ 2.1 (Continued): AS1241 Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft AS1339 Hose Assembly, Polytetrafluoroethylene,
23、Metallic Reinforced, 3000 psi 400F, Lightweight, Hydraulic and Pneumatic AS1946 Hose Assembly, Polytetrafluoroethylene, Metallic Reinforced, Up to 1500 psi and 450F, Hydraulic and Pneumatic AS1975 Hose Assembly, PTFE, Aramid Reinforced, 4000 psi, Hydraulic and Pneumatic AS4623 Hose Assembly, Polytet
24、rafluoroethylene, Para-Aramid Reinforced, 3000 psi, 275 F, Heavy-Duty, Aircraft Hydraulic Systems AS4897 Hose Assembly, Polytetrafluoroethylene (PTFE), Low Pressure, 450F and Fireproof, Procurement Specification For 2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor, West Conshohocken, PA 1
25、9428-2959. ASTM D 471 Standard Test Fluids, Hydrocarbon ASTM D 580 Stainless and Heat-Resisting Steel Wire ASTM A 1457 OTFE Molding and Extrusion Materials 2.3 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-509
26、4 or http:/assist.daps.dla.mil MIL-PRF-680 Dry Cleaning Solvent MIL-PRF-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base MIL-PRF-23699 Lubricating Oil, Aircraft Turbine Engine, High Temperature MIL-PRF-83282 Hydraulic Fluid, Fire Resistant Synthetic Hydrocarbon Base, Aircraft MIL-PRF-87
27、257 Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft and Missile MIL-STD-889 MILITARY STANDARD; DISSIMILAR METALS SAE INTERNATIONAL AIR5693 Page 5 of 13_ 2.4 Other References: Pruett, Kenneth M.; CHEMICAL RESISTANCE GUIDE FOR METALS AND ALLOYS; Compass Publicati
28、ons; Las Mesa, CA; 1995 Pruett, Kenneth M.; COMPASS CORROSION GUIDE II; A Guide to Chemical Resistance of Metals and Engineering Plastics; Compass Publications; Las Mesa, CA; 1983 Pruett, Kenneth M.; CHEMICAL RESISTANCE GUIDE FOR ELASTOMERS II; Compass Publications; Las Mesa, CA; 1994 3. METALS: TAB
29、LE 1 - Corrosive Agents That Attack Metals Metal Types Known Corrosive Agents Comments Aluminum For example: A92014 A92024 A96061, etc. Sulfides/sulfates/sulfites Halides such as chlorides/chlorites salt water nitrates; urea strong acids (e.g., red fuming nitric acid) strong bases OK for phosphate e
30、ster OK for fuels, oils, etc. Corrosion Resistant Steel (CRES) For example: S30400 S30403 S30321, etc. Halides such as chlorine/chlorides/ chlorates/chlorites Halides work symbiotically with sulfur/sulfides/sulfites to multiply the corrosive effects Sulfides/sulfates/sulfites Nitrates Strong acids S
31、trong bases OK for phosphate ester OK for fuels, oils, etc. Concentrations of chlorine/chlorides less than 200 ppm allowable Nickel based alloys For example: N06625 N07718, etc. Sulfides/sulfates/sulfites Halides in strong concentrations strong acids strong bases OK for phosphate ester OK for fuels,
32、 oils, etc. Nickel alloy is resistant to chlorine contamination Titanium For example: R56400, etc. Chlorine, fluorine in high concentrations attack titanium strong acids strong bases OK for phosphate ester OK for fuels, oils, etc. Pure chlorine gas will cause titanium to combust SAE INTERNATIONAL AI
33、R5693 Page 6 of 13_ 3.1 CRES, Nickel based alloys and titanium fittings and AS1946 or MIL-DTL-25579 hose assemblies are suitable for operational temperatures between -67 to 450 F. Most other CRES wire reinforced hose assemblies are temperature limited to 400 F. The PTFE tube material properties limi
34、ts the hose assemblys temperature range. 3.2 PTFE hose assemblies with aluminum fittings and tube assemblies are suitable for operational temperatures between -67 to 275 F. 3.3 Most aerospace applications employ fluids that are not corrosive to the above listed engineering materials. However, specia
35、l attention must be made to cleaning and inspection fluids, solvents, etc. that may inadvertently come in contact with any of these materials. 3.4 In the event of questions concerning the compatibility of any particular fluid with any of the above types of metals, it is the responsibility of the sys
36、tem (user) engineer to conduct the necessary compatibility tests. 4. POLYTETRAFLUOROETHYLENE (PTFE) TUBE: TABLE 2 - Corrosive Agents That Attack Aerospace PTFE Material Type Known Corrosive Agents Comments Polytetrafluoroethylene; PTFE Base resin per ASTM D 1457, Type III, Grade 2 or Grade 3 None PT
37、FE is not attacked by weak or strong acids or by weak or strong alkalies; nor is it attacked by organic solvents 4.1 MIL-DTL-25579 allows for fluid and ambient temperatures between -67 to 450 F. Most other CRES wire reinforced hose assembly types (such as AS1227, AS1339) are limited to 400 F maximum
38、. In general, abrasion covers, made from polyester or nylon, etc., are temperature limited to 300 F. SAE INTERNATIONAL AIR5693 Page 7 of 13_ 5. SILICONE FIRESLEEVE: TABLE 3 - Agents That May Attack Silicone Based Firesleeve Materials Material Type Chemical Agents That May Degrade or Damage the Silic
39、one Rubber (Type VQM) Coating or Sleeve Comments Integral, silicone fire resistant cover (type VQM silicone rubber) Slip on type AS1072 Type 2 fire sleeve (with type VQM silicone rubber) fuels, greases and oils aliphatic hydrocarbons alicyclic hydrocarbons solvents refrigerant strong acids naphta si
40、licone oils skydrol Keep the silicone fire resistant cover clean and dry. Casual contact by chemical agents is unavoidable and must be immediately wiped off. 5.1 It is important that these materials be kept free of petroleum and other fluid contaminants to prolong their life. 5.2 Silicone rubber shr
41、inks as it heat ages and may crack as it shrinks. 5.3 Silicone rubber may swell, blister and crack when it absorbs many of the listed fluids. Casual contact means that the silicone rubber must be kept dry. In the event fluids come in contact with silicone rubber, it is recommended the fluid be immed
42、iately wiped off. 6. PARA-ARAMID YARN REINFORCED HOSE AND HOSE ASSEMBLIES (CITED IN AS1975): TABLE 4 Compatible With Comments PARA-ARAMID (p-aramid (Kevlar) (m-aramid (Nomex) AS1241 Fire resistant phosphate ester hydraulic fluid -The AMS materials and para-aramid reinforcement are compatible with ph
43、osphate ester and/or silicate ester hydraulic fluids. Test assemblies are conditioned either by AS1241, Type IV or by MIL-PRF-83282 fluid. Exposure time to be determined by test for each application. -Para-aramid fibers are sensitive to and may be damaged by direct sunlight. -Operational temperature
44、s are limited to 275 F. MIL-H-5606 and MIL-PRF-83282 MIL-H-5606 is obsolete for new applications and is superceded by MIL-PRF-83282 SAE INTERNATIONAL AIR5693 Page 8 of 13_ 7. OTHER COVER AND REINFORCEMENT YARNS USED TO BRAID HOSE LENGTHS: TABLE 5 Compatible With Comments CORDURA (NYLON) MOST FUELS,
45、OILS AND SOLVENTS NYLON 6,6 MOST FUELS, OILS AND SOLVENTS POLYESTER 7.1 Recommend that these materials be tested for compatibility with each fluid found in a particular application. These yarns are not controlled by a material specification. 8. SEVERAL TYPES OF FUELS USED IN AEROSPACE APPLICATIONS:
46、TABLE 6 Fluid PTFE and Fitting Materials VMQ Silicone for (Integral or AS1072 Type 2 Fire Resistant Protection) Comments MIL-DTL-83133 (JP-8, AVTUR) NATO codes F34, F35, F37, F44, F46; D Eng RD2454 (F40) Compatible Casual contact only (jet) turbine engine fuel MIL-DTL-5624 (JP-4, AVTAG JP-5, AVCAT) Compatible Casual contact only (jet) turbine engine fuel Supersedes MIL-T-5624 JP-8 with +100 additive F34 with +100 additive Compatible Casual contact only The additive attacks paper containing fuel filter/water separator elements. ASTM D 1655, Type A, A1, or B Compatible Casual contact only Alte
