NAVY MIL-PRF-5425 E-1998 PLASTIC SHEET ACRYLIC HEAT RESISTANT《耐热丙烯酸塑料板》.pdf

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1、PERFORMANCE SPECIFICATIONPLASTIC SHEET, ACRYLIC, HEAT RESISTANTThis specification is approved for use by all Departments and Agencies of the Departmentof Defense.1. SCOPE1.1 Scope . This specification covers optical quality, transparent, heat-resistant, cast acrylicplastic sheet. The requirements ar

2、e for flat sheet material that has not been formed.2. APPLICABLE DOCUMENTS2.1 General . The documents listed in this section are specified in sections 3 and 4 of thisspecification. This section does not include documents cited in other sections of this specificationor recommended for additional info

3、rmation or as examples. While every effort has been made toensure the completeness of this list, document users are cautioned that they must meet allspecified requirements documents cited in sections 3 and 4 of this specification, whether or notthey are listed.2.2 Non-Government publications . The f

4、ollowing documents form a part of this documentto the extent specified herein. Unless otherwise specified, the issues of the documents which areDoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unlessotherwise specified, the issues of documents not listed in the DoDI

5、SS are the issues of thedocuments cited in the solicitation (see 6.2).AMSC N/A FSC 9330DISTRIBUTION STATEMENT A . Approved for public release; distribution is unlimited.INCH-POUNDMIL-PRF-5425E5 October 1998SUPERSEDINGMIL-P-5425D28 September 1979Beneficial comments (recommendations, additions, deleti

6、ons) and any pertinent data which maybe of use in improving this document should be addressed to: Commander, Naval Air WarfareCenter Aircraft Division, Code 414100B120-3, Highway 547, Lakehurst, NJ 08733-5100, byusing the Standardization Document Improvement Proposal (DD Form 1426) appearing at thee

7、nd of this document or by letter.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5425E2AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)ASTM-D542 - Index of Refraction of Transparent Organic Plastics, StandardTest Method for (DoD adopted)ASTM

8、-D570 - Water Absorption of Plastics, Standard Test Method for(DoD adopted)ASTM-D635 - Rate of Burning and/or Extent and Time of Burning of Self-Supporting Plastics in a Horizontal Position, Standard TestMethod for (DoD adopted)ASTM-D638 - Tensile Properties of Plastics, Standard Test Method for(DoD

9、 adopted)ASTM-D648 - Deflection Temperature of Plastics Under Flexural Load,Standard Test Method for (DoD adopted)ASTM-D696 - Coefficient of Linear Thermal Expansion of P lastics Between30 Degrees C and 30 Degrees C, Standard Test Method for(DoD adopted)ASTM-D792 - Density and Specific Gravity (Rela

10、tive Density) of Plastics byDisplacement, Standard Test Methods for (DoD adopted)ASTM-D1003 - Haze and Luminous Tra nsmittance of Transparent Plastics,Standard Test Method for (DoD adopted)ASTM-F733 - Optical Distortion and Deviation of Transparent Parts Usingthe Double-Exposure Method, Standard Pra

11、ctice for (DoDadopted)ASTM-G26 - Operating Light-Exposure App aratus (Xenon-Arc Type) Withand Without Water for Exposure of Nonmetallic Materials,Standard Practice for (DoD adopted)(Application for copies should be addressed to the American Society for Testing andMaterials, 100 Barr Harbor Drive, We

12、st Conshohocken, PA 19428-2959.)2.3 Order of precedence . In the event of a conflict between the text of this document andthe references cited herein, the text of this document takes precedence. Nothing in this document,however, supersedes applicable laws and regulations unless a specific exemption

13、has beenobtained.3. REQUIREMENTS3.1 Qualification . The plastic sheet furnished under this specification shall be a product thatis authorized by the qualifying activity for listing on the applicable qualified products list beforecontract award (see 4.2 and 6.3).Provided by IHSNot for ResaleNo reprod

14、uction or networking permitted without license from IHS-,-,-MIL-PRF-5425E33.2 Materials . The plastic sheet shall be an acrylic plastic that is transparent and meets allthe requirements of this specification.3.2.1 Color . Unless otherwise specified (see 6.2), the plastic sheet shall be colorless.3.2

15、.2 Dimensions . Dimensions of the plastic sheet shall be as specified by applicabledrawings. Unless otherwise specified (see 6.2), the tolerance on length and width dimensionsshall be 0.063 inch (1.6 mm).3.2.3 Thickness . The actual thickness of the plastic sheet at any point shall be within thetole

16、rances specified in table I. Thickness variations of sheets not included in table I shall be notgreater than the tolerance for the next larger thickness.3.3 Performance characteristics . The plastic sheet shall meet the requirements of table IIwhen tested in accordance with table IV.3.4 Formability

17、. Formability shall be determined as specified in 4.5.3.3.4.1 Sheets 0.500 inch (12.7 mm) and less in thickness . After the heating procedure in4.5.3.1, the plastic sheet shall be formed into a hemispheric shape with an outside diameter of10 0.1 inches (25 0.2 cm) and a draw of not less than 4.5 inc

18、hes (11.5 cm).3.4.2 Sheets over 0.500 inch (12.7 mm) in thickness . After the heating procedure in 4.5.3.2,the plastic sheet shall be formed into a cylindrical shape with an outside radius equal to theformability radius specified in table I. There shall be no surface irregularities or crazing after

19、aspecimen cut from the formed sheet is exposed to accelerated weathering as specified in 4.5.10.1.3.5 Resistance to weathering . After exposure to accelerated or natural weathering asspecified in 4.5.10, the plastic sheet shall show no evidence of cracking, crazing, or other surfaceirregularities th

20、at affect visibility.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5425E4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5425E5TABLE II. Performance characteristics .CHARACTERISTIC R

21、EQUIREMENTSpecific gravity 1.19 0.01Water absorption See table IRate of burning See table ICoefficient of thermal expansion per F ( C), maximum 0.000055 (0.00010)Internal strain (dimensional change), percent, maximum 1Flexural deformation temperature, F ( C)0.500 inch and less in thicknessOver 0.500

22、 inch in thickness185 to 239 (85 to 115)194 to 242 (90 to 117)Tensile strength, psi (MPa), minimumAs receivedAfter natural weathering8000 (55.2)8000 (55.2)Elongation, percent, minimumAs receivedAfter natural weathering22Ultraviolet transmittance (290 to 330 m range), percent,maximum5Index of refract

23、ion 1 / 1.49 0.01Luminous transmittance, percent, minimum 1 /Thickness, inch:0.060 through 0.187As receivedAfter accelerated and natural weatheringOver 0.187 through 0.312As receivedAfter accelerated and natural weatheringOver 0.312 through 0.417As receivedAfter accelerated and natural weatheringOve

24、r 0.417 through 1.000As receivedAfter accelerated and natural weathering9190908989878986Haze, percent, maximum 1 /As receivedAfter accelerated weatheringAfter natural weathering334Warpage after accelerated weathering See table IThermal stability No evidence of blistering1 / Requirement is for colorl

25、ess plastic sheet.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5425E63.6 Optical uniformity .3.6.1 Optical defects . The plastic sheet shall contain no optical defects, such as embeddedparticles, bubbles, scratches, or imperfections, that

26、reduce visibility through the sheet and cause avariation in angular deviation of more than 5 minutes within a distance of not more than 20 inches(50 cm) on a grid board when tested as specified in 4.5.12.1. Blemishes that do not individuallyreduce visibility through the sheet shall be disregarded un

27、less they form a cluster. Optical defectswithin 1 inch (25.4 mm) from the edge of the sheet shall also be disregarded.3.6.2 Angular deviation . The plastic sheet shall contain no surface irregularities which causeangular deviations on either side of the undeviated position that are greater than the

28、limitsspecified in table III when tested as specified in 4.5.12.2.TABLE III. Angular deviation .SHEET THICKNESS LIMITS OF PERMISSIBLE DEVIATION 1 /0.060 through 0.220 inch 7 minutes at any location more than 1 inch fromthe edge of the sheet.Over 0.220 through 0.250 inch 7 minutes at any location mor

29、e than 3 inchesfrom the edge of the sheet and 9 minutesbetween 3 inches and 1 inch of the edge.Over 0.250 through 0.375 inch 7 minutes at any location more than 3 inchesfrom the edge of the sheet and 12 minutesbetween 3 inches and 1 inch of the edge.Over 0.375 through 0.500 inch 7 minutes at any loc

30、ation more than 3 inchesfrom the edge of the sheet and 14 minutesbetween 3 inches and 1 inch of the edge.Over 0.500 through 1.000 inch 12 minutes at any location more than 3 inchesfrom the edge of the sheet and 20 minutesbetween 3 inches and 1 inch of the edge.1 / Surface irregularities within 1 inc

31、h from the edge of the sheet shall be disregarded.3.7 Instruction sheet . An instruction sheet containing information relating to the necessaryprecautions to be observed in the use, forming, cementing, handling, and storage of the plasticsheet shall be included in each shipping container.3.8 Protect

32、ive covering . A protective covering shall be applied to both sides of the plasticsheet to protect the surfaces from scratches and abrasions. The covering shall be easily removedwithout injury or damage to the surface. The plastic sheet shall be identified on the protectivecovering by specification

33、number, thickness, manufacturers code, and national stock number.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5425E74. VERIFICATION4.1 Classification of inspections . The inspection requirements specified herein are classifiedas follows:a.

34、 Qualification inspection (see 4.2).b. Conformance inspection (see 4.3).4.2 Qualification inspection . Qualification inspection shall consist of all the tests specified intable IV.TABLE IV. Qualification inspection .REQUIREMENT TEST METHODCHARACTERISTIC PARAGRAPH OR PARAGRAPHThickness 3.2.3 4.5.1Spe

35、cific gravity Table II ASTM-D792Water absorption Table I ASTM-D570Rate of burning Table I ASTM-D635Coefficient of thermal expansion Table II 4.5.2Formability 3.4 4.5.3Internal strain Table II 4.5.4Flexural deformation temperature Table II 4.5.5Tensile strength Table II 4.5.6.1Elongation Table II 4.5

36、.6.2Ultraviolet transmittance Table II 4.5.7Index of refraction Table II 4.5.8Luminous transmittance Table II 4.5.9Haze Table II 4.5.9Resistance to weathering 3.5 4.5.10Warpage after accelerated weathering Table I 4.5.11Optical uniformity 3.6 4.5.12Thermal stability Table II 4.5.13Instruction sheet

37、3.7 VisualProtective covering 3.8 VisualProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5425E84.2.1 Qualification test sample . The qualification test sample shall consist of not less than20 square feet (1.9 square meters) of plastic sheet fo

38、r each thickness. Individual sheet dimensionsshall be not less than 12 by 36 inches (30 by 90 cm). To be qualified for all thicknesses,manufacturers shall submit samples of plastic sheet with nominal thicknesses of 0.060, 0.125,0.250, 0.500, 0.750, and 1.000 inch (1.5, 3.2, 6.4, 12.7, 19.0, and 25.4

39、 mm). Qualificationsamples for specific thicknesses may also be submitted.4.2.1.1 Test specimens . Test specimens shall be prepared from a portion of the sheet sample(see 4.2.1) to complete the tests specified for mechanical properties (see 4.5.6).4.3 Conformance inspection .4.3.1 Visual and dimensi

40、onal inspection . Each lot (see 6.4) shall be sampled as specified(see 6.2). Visual and dimensional defects shall be as specified in table V.TABLE V. Visual and dimensional inspection .INSPECTION DEFECTAppearance Bubbles, striae, chips, or scratches.Waves, distortion, irregularities, or other defect

41、s that wouldrender the sheet unfit for viewing objects through it.Surfaces not made to a smooth or polished finish.Embedded particles, such as grit or other foreign matter.Ragged or rough edges or sides.Color Not colorless, or not color specified.Protective covering Not easily peeled. Surfaces marke

42、d when removed.Length and width Varies by more than 0.063 inch (1.6 mm) from length or widthspecified, unless greater tolerance permitted (see 6.2).Thickness Varies by more than the applicable tolerance specified in table I.(For thickness of sheets not listed in table I, the tolerance for thenext la

43、rger thickness shall apply.)4.3.2 Physical and mechanical inspection . Three samples shall be randomly selected fromeach lot (see 6.4). Test specimens shall be prepared from each sample to complete the testsspecified in table VI.Provided by IHSNot for ResaleNo reproduction or networking permitted wi

44、thout license from IHS-,-,-MIL-PRF-5425E9TABLE VI. Physical and mechanical inspection .NUMBER RESULTS RECORDED ASOF DETER- PASS AVERAGE ( 1 /)REQUIREMENT TEST MINATIONS OR NUMERICALLYCHARACTERISTIC PARAGRAPH PARAGRAPH PER SAMPLE FAIL TO THE NEAREST:FlexuraldeformationtemperatureTable II 4.5.5 2 0.1

45、CLuminoustransmittance, asreceivedTable II 4.5.9 2 0.1 percentHaze, as received Table II 4.5.9 2 0.1 percentOptical defects 3.6.1 4.5.12.1 2 X Angular deviation 3.6.2 4.5.12.2 2 1 minuteThermal stability Table II 4.5.13 1 X 1 / All values shall be recorded.4.4 Test conditions .4.4.1 Standard conditi

46、ons . Unless otherwise specified in the applicable test method, all testsand inspections shall be conducted at a temperature of 77 2 F (25 1 C) and a relativehumidity of 50 5 percent.4.4.2 Test results . Unless otherwise specified in the applicable test method, all test resultsshall be recorded as t

47、he average of the number of specimens being tested as well as eachindividual value.4.5 Methods of inspection .4.5.1 Thickness . Thickness measurements shall be made with any device having an accuracyof 0.001 inch (0.025 mm) and shall meet the requirement of 3.2.3.4.5.2 Coefficient of thermal expansi

48、on . Two test specimens shall be tested in accordancewith ASTM -D696. If the results obtained on the two spe cimens are within 10 percent, theaverage of the two values shall be recorded. If not, the test shall be repeated. Results shall meetthe requirement in table II.Provided by IHSNot for ResaleNo

49、 reproduction or networking permitted without license from IHS-,-,-MIL-PRF-5425E104.5.3 Formability .4.5.3.1 Sheets 0.500 inch (12.7 mm) and less in thickness . Two test specimens, 14 inches(35.6 cm) in diameter, shall be formed to determine conformance to 3.4.1. The heatingtemperature and pressure to be used shall be in accordance with the manufacturers instructions.4.5.3.2 Sh