SAE AS 5127 1C-2014 Aerospace Standard Test Methods for Aerospace Sealants Two-Component Synthetic Rubber Compounds.pdf

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1、_ 6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVSX EOLVKHGE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDODQGHQJL neering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, incOXGLQJDQSDWHQWLQIULQJHPHQWDULVLQJWKHUHIURPLVWKHVROHUHVSRQVLELOL W

2、RIWKHXVHU SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored

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4、il: CustomerServicesae.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/AS5127/1C AEROSPACE STANDARD AS5127/1 REV. C Issued 1997-05 Revised 2014-10 Superseding AS5127/1B Aerospace Standard T

5、est Methods for Aerospace Sealants Two-Component Synthetic Rubber Compounds RATIONALE Revision C is a 5-year update that provides updated procedures and many clarifications for the sealing compound/sealant test methods. TABLE OF CONTENTS 1. SCOPE 4 2. REFERENCES 4 2.1 SAE Publications . 4 2.2 ASTM P

6、ublications 5 2.3 U.S. Government Publications 5 3. CLASSIFICATION . 5 3.1 Classes 5 3.1.1 Class A 5 3.1.2 Class B 5 3.1.3 Class C 6 3.1.4 Class D 6 3.1.5 Class E 6 3.2 Application Time or Work life 6 4. PREPARATION OF SEALING COMPOUND . 6 4.1 Qualification Testing 6 4.2 Acceptance Testing . 6 4.3 T

7、hawing of Quick-Frozen Sealing Compound 6 5. APPLICATION PROPERTIES TEST METHODS . 7 5.1 Nonvolatile Content . 7 5.2 Air Content (Class B Sealant Base Compound Only) . 9 5.3 Viscosity of Base Compound 10 5.4 Viscosity of the Curing Agent 11 5.5 Flow (Classes B, C, and D) . 11 5.5.1 Flow for Classes

8、B and D 11 5.5.2 Flow for Class C 14 5.6 Application Time 14 5.6.1 Class A and E Material 14 5.6.2 Class B, C, and D Material 14 5.7 Assembly Time (Class C only) 15 SAE INTERNATIONAL AS5127/1C Page 2 of 44 5.8 Tack-Free Time . 15 5.9 Standard Curing 15 5.10 Low-Temperature Cure Time (Classes A and B

9、 only) 15 5.11 Fluid Immersion Cure Time (Classes A-1/4, A-1/2, B-1/4, and B-1/2 only) 17 5.12 Soluble Chromate Level 17 5.12.1 Extraction 17 5.12.2 Titration . 17 5.12.3 Calculation 17 5.12.4 Alternate Tests for Soluble Chromate . 17 6. PERFORMANCE PROPERTIES TEST METHODS 18 6.1 Specific Gravity .

10、18 6.2 14-Day Hardness 18 6.3 Radiographic Density 18 6.3.1 Preparation of Test Panels . 18 6.3.2 Application of Sealant . 18 6.3.3 Test Procedure 18 6.4 Resistance to Thermal Expansion 19 6.5 Heat Reversion Resistance (Classes B and C only) 19 6.6 Hydrolytic Stability . 20 6.7 Shaving and Sanding (

11、Class B only) 20 6.8 Paintability . 21 6.9 Weathering 21 7. RESISTANCE TO HYDROCARBONS . 22 7.1 Chalking 22 7.2 Resistance to Thermal Rupture 22 7.3 Fluid Rupture Resistance (B-1/6, B-1/4, and B-1/2 only) 24 7.4 Weight Loss and Flexibility . 24 7.5 Volume Swell 25 7.6 Low-Temperature Flexibility 26

12、7.6.1 Alternate Low Temperature Flexibility Testing 27 7.6.2 Low-Temperature Flexibility (Windshield Sealant) . 28 7.7 Tensile Strength and Elongation . 29 7.8 Shear Strength 30 7.9 Corrosion in Hydrocarbon Fluid/Salt Water 31 7.10 Corrosion Stressed Assembly and Mixed Metals . 31 7.10.1 Stressed As

13、sembly . 31 7.10.2 Mixed-Metal Assemblies . 31 7.10.3 Corrosion Exposure Conditions and Examination 34 7.11 Crazing 34 8. PEEL STRENGTH PROPERTIES 38 8.1 Peel Strength Testing 38 8.1.1 Classes B, D, and E 41 8.1.2 Classes A and C . 42 8.1.3 Fluid Immersed Peel Strength for Classes A-1/4, A-1/2, B-1/

14、4, B-1/2 42 8.1.4 Peel Strength for Repair for Classes A-1/4, A-1/2, B-1/4, B-1/2 . 42 8.2 Repairability 42 8.2.1 Peel Strength for Repair for Classes A-1/4, A-1/2, B-1/4, B-1/2 . 43 9. STORAGE STABILITY 43 9.1 Accelerated Storage Stability 43 9.2 Long Term Storage . 43 10. NOTES 44 FIGURE 1 - PLAST

15、IC DISPOSABLE CARTRIDGE, PLUNGER AND NOZZLE 7 SAE INTERNATIONAL AS5127/1C Page 3 of 44 FIGURE 2 - SEALANT CARTRIDGE FOR TWO-COMPONENT MATERIALS (ACCEPTABLE, TYPE I -T6 Sheet -T651 Plate), Solution and Precipitation Heat Treated AMS4911 Titanium Alloy, Sheet, Strip, and Plate, 6Al - 4V, Annealed AMS-

16、C-27725 Coating, Corrosion Preventative, for Aircraft Integral Fuel Tanks for Use to 250 F (121 C) AMS-G-25667 Glass, Monolithic, Aircraft Glazing AMS-P-83310 Plastic Sheet, Polycarbonate, Transparent AS5127 Aerospace Standard Test Methods for Aerospace Sealants, Methods for Preparing Aerospace Seal

17、ant Test Specimens SAE INTERNATIONAL AS5127/1C Page 5 of 44 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D329 Standard Specification for Acetone ASTM D792 Standard Test Methods f

18、or Density and Specific Gravity (Relative Density) of Plastics by Displacement ASTM D1193 Standard Specification for Reagent Water ASTM D2240 Standard Test Method for Rubber Property - Durometer Hardness ASTM D3359 Standard Test Methods for Measuring Adhesion by Tape Test ASTM D4214 Standard Test Me

19、thods for Evaluating the Degree of Chalking of Exterior Paint Films ASTM D5032 Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Glycerin Solutions ASTM E11 Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves ASTM E1742 Standard Practice for Radiogra

20、phic Examination ASTM G85 Standard Practice for Modified Salt Spray (Fog) Testing ASTM G155 Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials 2.3 U.S. Government Publications Available from DLA Document Services, Building 4/D, 700 Robbins Avenue, Philad

21、elphia, PA 19111-5094, Tel: 215-697-6396, http:/quicksearch.dla.mil/. MIL-PRF-5425 Plastic Sheet, Acrylic, Heat Resistant MIL-PRF-23377 Primer Coatings: Epoxy, High-Solids MIL-PRF-25690 Plastic, Sheets and Formed Parts, Modified, Acrylic Base, Monolithic, Crack Propagation Resistant MIL-PRF-85285 Co

22、ating: Polyurethane, Aircraft and Support Equipment MIL-PRF-85582 Primer Coatings: Epoxy, Waterborne 3. CLASSIFICATION The sealing compound may be of the following designations: 3.1 Classes 3.1.1 Class A Sealing compound suitable for application by brush. 3.1.2 Class B Sealing compound suitable for

23、application by extrusion gun, spatula, brush, or roller. SAE INTERNATIONAL AS5127/1C Page 6 of 44 3.1.3 Class C Sealing compound suitable for application by extrusion gun, spatula, brush, or roller. 3.1.4 Class D Sealing compound suitable for application by extrusion gun or spatula. 3.1.5 Class E Se

24、aling compound suitable for application by automatic riveting equipment. 3.2 Application Time or Work life Dash numbers following the sealing compound classification, e.g., B-2, shall be used to designate the maximum application time in hours for Classes A, B, D, and E. Class C dash numbers represen

25、t application time and assembly time in hours, e.g., C-12(48). 4. PREPARATION OF SEALING COMPOUND 7KHVHDOLQJFRPSRXQGPXVWEHPLHGDFFRUGLQJWRWKHPDQXIDFWXUHUVLQV tructions. The mix ratio of sealant base compound and the curing agent of two-part sealant shall be maintained as specified by the manufacturer

26、. NOTE: In order to achieve the expected cured sealant properties both curing agent and base compound must be mixed thoroughly to complete uniformity with no visible streaks or swirls of unmixed material. Both curing agent and base compound must be moved physically by the stirring instrument and the

27、 container walls. If mixed by hand the mixing blade shall be scraped frequently to ensure a complete blend. To minimize introduction of air into the sealant mixture (see AIR4069), no swirling motion should be used when stirring. To avoid risk of overheating the mixture and compromising application p

28、roperties the sealant mixture should not be over-mixed or mixed too fast. 4.1 Qualification Testing Manufacturers instructions for mixer operation and mixing must be followed. Plastic disposable cartridges, as shown in Figure 1 may be used, or a suitable manufacturers recommended alternative to hold

29、 the mixed sealant, from which it can later be extruded from the cartridges for sealing application and specimen fabrication. If specified in the applicable material specification, sealing compound may be provided in cartridges for multiple component sealants as shown in Figure 2 for Type I and Type

30、 II kits, and shall be mixed according to sealant manufacturers instructions. 4.2 Acceptance Testing Sealing compound supplied in multi-component (e.g., barrier or injection) kits for acceptance testing may be machine or hand-PLHGIROORZLQJWKHPDQXIDFWXUHUVUHFRPPHQGHGLQVWUXFWLRQVXVLQJWKHDSSURSUL DWHUD

31、WLRRIEDVHFRPSRXQGWRFXULQJagent. 4.3 Thawing of Quick-Frozen Sealing Compound For application time, flow, tack-free time, and curing rate tests, the sealing compound shall be thawed according to the PDQXIDFWXUHUVUHFRPPHQGDWLRQV7LPHHURVKDOOEHJLQRQFHWKHPDWHULDOLQWKHFRQ WDLQHUKDVFRPSOHWHOWKDZHGKDVreache

32、d a maximum temperature of 50 F (10 C), or when condensation does not occur after wiping the container dry with cloth. SAE INTERNATIONAL AS5127/1C Page 7 of 44 5. APPLICATION PROPERTIES TEST METHODS 5.1 Nonvolatile Content Three samples of the sealing compound shall be tested. Weigh a cup to the nea

33、rest 0.001 g (W1). Transfer 11 to 12 g of mixed sealing compound to the cup as rapidly as possible within 5 minutes of the completion of mixing, and weigh immediately to the nearest 0.001 g (W2). Place the sealing compound and uncovered cup in an air circulating or friction oven that has been prehea

34、ted to 158 F (70 C). After heating for seven days or as specified in the applicable material specification, place the sealing compound and cup in a desiccator and cool to room temperature. Weigh to the nearest 0.001 g (W3). Determine (W2 - W1) and (W3 - W1). Calculate the percent nonvolatile content

35、 as shown in Equation 1: 100WWWWenonvolatilPercent1213 u (Eq. 1) The measured value shall be checked for conformance to the applicable material specification. Note: Dimensions in inches (millimeters) FIGURE 1 - PLASTIC DISPOSABLE CARTRIDGE, PLUNGER AND NOZZLE 4.0 0.1 (102 2.5) 0.115 / 0.135 (2.92 /

36、3.43) Dia. Orifice SAE INTERNATIONAL AS5127/1C Page 8 of 44 Note: Dimensions in inches (millimeters) FIGURE 2 - SEALANT CARTRIDGE FOR TWO-COMPONENT MATERIALS (ACCEPTABLE, TYPE I the total volume of fluid may be up to 500 mL. 5.12.2 Titration Transfer 200 mL 10 mL of the extracted solution to a 600 m

37、L beaker, cover with a watch glass, and gently boil for 10 minutes. Add 10 mL 0.5 mL of a 0.25% silver nitrate solution (2.5 g 0.01 g of silver nitrate in 1000 mL 10 mL of reagent water conforming to ASTM D1193 Type IV). Cautiously add 1.5 g 0.01 g of ammonium persulfate. Boil gently for an addition

38、al 10 minute. Allow to cool, add 5 mL 0.5 mL of 1:1 sulfuric acid for each 100 mL of solution, then titrate with 0.1 N ferrous ammonium sulfate solution. Use a platinum and Ag/AgCl electrode combination in a potentiometric titration to maximum deflection. 5.12.3 Calculation OH5.MgCrCo%E 100DCBA 24 u

39、uuu (Eq. 3) where: A = mL ferrous ammonium sulfate B = dilution factor (2 if 200 mL of a 400 mL extract was used in the titration) C = normality of ferrous ammonium sulfate D = 0.0768 (milliequivalent weight of MgCrO4 5H2O) E = weight of sample in grams The calculated value shall be checked for conf

40、ormance to the requirements of the applicable material specification. 5.12.4 Alternate Tests for Soluble Chromate Soluble chromate level may also be determined using either of the following test methods: a. Lachat Quik-Chem 10-124-13-1-A for Hexavalent Chromium b. Optical Emission Spectroscopy SAE I

41、NTERNATIONAL AS5127/1C Page 18 of 44 6. PERFORMANCE PROPERTIES TEST METHODS 6.1 Specific Gravity Three test specimens approximately 0.125 x 1 x 1 inch (3.18 x 25 x 25 mm) in size shall be cut out with a sharp blade from a sheet of the sealing compound that has been cured at standard conditions in ac

42、cordance with AS5127 (4), for the time defined in the applicable material specification. Determine the specific gravity of each sample in accordance with ASTM D792, Method A. The averaged value shall be checked for conformance to the applicable material specification for the sealing compound under t

43、est. 6.2 14-Day Hardness The instantaneous Type A Durometer hardness shall be determined in accordance with ASTM D2240 after the sealing compound has been cured for 14 days at standard conditions in accordance with AS5127 (4). The reading shall be taken using two 0.125 inch (3.18 mm) thick specimens

44、, stacked back to back to make a total thickness of 0.25 inch (6.4 mm). The measured hardness shall be checked for conformance to the applicable material specification. For quality acceptance testing only, the above hardness can be measured prior to 14 days duration at standard conditions in accorda

45、nce with AS5127 (4). If the recorded hardness exceeds the minimum requirements of the applicable material specification, then the result is acceptable. 6.3 Radiographic Density NOTE: The AMS Committee G-9 is removing this requirement from the AMS sealing compound specifications based on its value in

46、 detecting sealing compound failures and the development of NDI equipment for inspection. 6.3.1 Preparation of Test Panels A 6 inch (152 mm) square plate, 0.25 inch (6.4 mm) thick shown in Figure 6, shall be prepared from AMS4049 aluminum alloy. A notch 0.25 inch (6.4 mm) wide shall be milled to a d

47、epth of 0.125 inch (3.18 mm) half way across the plate. A continuation of this notch shall be milled completely through the remaining half to form a slot in the plate. 6.3.2 Application of Sealant After cleaning the test panel according to AS5127 (6.1), a sample of the sealant to be tested shall be mixed according to WKHPDQXIDFWXUHUVUHFRPPHQGHGSURFHGXU