1、Designation: D4802 10D4802 15Standard Specification forPoly(Methyl Methacrylate) Acrylic Plastic Sheet1This standard is issued under the fixed designation D4802; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification covers monolithic met
3、hacrylate sheets produced by various processes. For this specification, methacrylatesheet shall be composed of polymerized acrylic monomers of which at least 80 % shall be methyl methacrylate.NOTE 1This specification is intended to consolidate the requirements of the Cast Methacrylate Plastic Sheets
4、 portion of discontinued Fed. Spec.L-P-391D, discontinued Specification D702. Cast Methacrylate Plastic Sheets, Rods, Tubes and Shapes, and discontinued Specification D1547, ExtrudedAcrylic Plastic Sheet.1.2 This specification is intended to cover acrylic sheet for general-purpose applications. For
5、specialty applications consult theappropriate use standards.1.3 The following safety hazards caveat pertains only to the test methods portion, Section 8, of this specification:This standarddoes not purport to address all of the safety concerns, if any, associated with its use. It is the responsibili
6、ty of the user of thisstandard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.1.4 Acrylic sheet is used frequently in applications in which extreme clarity, lack of optical distortion and absence of any foreignparticulate m
7、atter are of primary significance. Reground material is suitable for use as long as careful control is used to eliminateadverse effects on these properties. The use of recycled material in type B-1 and B-2 sheet, is not suitable for use when theseproperties are adversely affected. The use of recycle
8、d or reground material is not possible for typeA-1 andA-2 materials since thesheet is produced directly from monomerNOTE 2This standard and ISO 7823-1 address the same subject matter, but differ in technical content.2. Referenced Documents2.1 ASTM Standards:2D256 Test Methods for Determining the Izo
9、d Pendulum Impact Resistance of PlasticsD542 Test Method for Index of Refraction of Transparent Organic PlasticsD570 Test Method for Water Absorption of PlasticsD638 Test Method for Tensile Properties of PlasticsD648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgew
10、ise Position (Withdrawn 2016)3D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1003 Test Method for Haze and Luminous Transmittance of Transparent PlasticsD1044 Test Method for Resistance of Transparent Plastics to
11、 Surface AbrasionD1308 Test Method for Effect of Household Chemicals on Clear and Pigmented Organic FinishesD3002 Guide for Evaluation of Coatings Applied to Plastics (Withdrawn 2016)3D3359 Test Methods for Measuring Adhesion by Tape TestD3892 Practice for Packaging/Packing of PlasticsE29 Practice f
12、or Using Significant Digits in Test Data to Determine Conformance with Specifications2.2 ISO Standard:ISO 7823-1 (E) PlasticsPoly(Methyl Methacrylate) SheetsTypes, Dimensions, and Characteristics41 This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct respo
13、nsibility of Subcommittee D20.15 on Thermoplastic Materials.Current edition approved July 1, 2010Dec. 15, 2015. Published July 2010January 2016. Originally approved in 1988. Last previous edition approved in 20022010 asD4802 02.D4802 10. DOI:10.1520/D4802-10.DOI:10.1520/D4802-15.2 For referencedASTM
14、 standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm
15、.org.4 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous versio
16、n. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes sectio
17、n appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 Definitions:3.1.1 GeneralThe definitions given in Terminology D883 are applicable to this specification.3.2 Definitions of Terms Sp
18、ecific to This Standard:3.2.1 bow warp, ndistortion in the form of a simple curve or arc extending across the sheet and displaced from the horizontalwhen the sheet is laying flat.3.2.2 edge kink warpage, ndistortion in the form of a twist, wrinkle, or scallop occurring along the perimeter of the she
19、et.3.2.3 “S” warp, ndistortion in the form of a compound curve or “S” shape caused by a nonuniform change in internal stresses.4. Classification4.1 Categories:4.1.1 Category A-1Methacrylate sheet typically manufactured by the cell-casting process. This category represents the bestoptical-quality she
20、et. It is characterized by the highest long-term design stress and the highest degree of chemical resistance foundin methacrylate sheet.4.1.2 Category A-2Methacrylate sheet typically manufactured by the continuous-casting method. The physical, chemical, andthermal properties are similar to CategoryA
21、-1 sheet. The optical quality is lower than CategoryA-1 sheet. This category has betterthickness control than that of Category A-1 sheet.4.1.3 Category B-1Methacrylate sheet manufactured by any of several processes (typically described as continuouslymanufactured sheet). This sheet possesses lower h
22、eat, chemical, and stress-craze resistance than Category A-1 and Category A-2sheet. It has equivalent or better optical quality and thickness tolerances than Category A-2 sheet.4.1.4 Category B-2Methacrylate sheet typically manufactured by conventional extrusion processes. This sheet is character-iz
23、ed by excellent thickness control similar to CategoryA-2 and Category B-1 sheet. This sheet has reduced long-term design stress,chemical resistance, optical quality, and thermal stability.4.2 FinishThe following are suitable specified finishes of methacrylate sheet. The physical and optical properti
24、es in thisspecification are based on Finish 1 material unless otherwise noted.4.2.1 Finish 1Smooth or polished.4.2.2 Finish 2Patterned, including textures and frosting.4.2.3 Finish 3Abrasion-resistant coated.4.2.3.1 Finish 3 material can be of any category provided it meets the requirements of that
25、category plus the additionalrequirements listed in Table 1.4.2.4 Type UVF (UV-Filtering)Materials that contain an ultraviolet absorber to limit the transmission of UV radiation throughthe sheet especially for protection of items sensitive to sunlight or UV radiation.4.2.5 Type UVT (UV-Transmitting)M
26、aterials that do not contain any UV absorbers and are used where there is a need totransmit a greater portion of UV radiation.4.2.6 For general-purpose applications neither type need be specified. If not specified, materials will usually contain UVabsorbers only sufficient to protect the polymer fro
27、m degradation from exposure to direct sunlight or UV radiation. There are nospecific UV-transmission requirements for material of unspecified type.TABLE 1 Finish 3 Abrasion Resistant MaterialProperty Test Method RequirementAbrasion resistance, 100 cycles at500 g loadD1044Haze, max, % 4.0Coating adhe
28、sion, percent retention,minsee 8.1.14 Minimum Classification4B, Fig. 1, TestMethods D3359Chemical resistance, visualexaminationD1308 no changeTABLE 1 Finish 3 Abrasion Resistant MaterialProperty Test Method RequirementAbrasion resistance, 100 cycles at500 g loadD1044Haze, max, % 4.0Coating adhesion,
29、 percent retention,minsee 8.1.14 Minimum Classification4B, Fig. 1, TestMethods D3359Chemical resistance, visualexaminationD1308 no changeD4802 1525. Detail Requirements5.1 The following applies to all specified limits in this specification. For purposes of determining conformance with thisspecificat
30、ion, an observed value or a calculated value shall be rounded to the nearest 1 MPa (100 psi) for tensile strength, and forall other properties shall be rounded to the nearest unit in the last righthand place of digits used in expressing the limiting value,in accordance with the rounding method of Pr
31、actice E29.5.2 Sheet shall conform to the requirements prescribed in Table 2. In addition, Category A-1 sheet shall conform to thepermissible-thickness variations listed in Table 3.5.3 ShrinkageTest in accordance with 8.1.7.5.4 Thermal StabilitySheet shall show no evidence of bubbling or blistering
32、when tested in accordance with 8.1.8.5.5 Abrasion-Resistant MaterialFinish 3 material (abrasion-resistant coated material) shall meet the requirements of thesubstrate material it is designated as and the properties shown in Table 1.5.6 WorkmanshipSheet, as delivered, shall be free from warpage, crac
33、ks, scratches, blisters, voids, foreign matter, die lines,and other defects that affect appearance or serviceability.5.6.1 Flatness of SheetSheet shall be free from edge kink warpage and from edge “S” warp when lying on a flat surface.Overall bow warp is permitted for all types of sheet to a maximum
34、 of 6.3 mm (0.250 in.) displacement from the horizontal foreach 4-ft length, or fraction thereof, of a sheet under its own weight when laying in the horizontal position on a flat continuoussurface. “S” warp that disappears or becomes bow warp when turned over is permitted.5.6.2 Chips and Dirt in She
35、et:5.6.2.1 Chips in Sheet of Thickness Equal to or Less Than 51 mm (2.008 in.)The maximum permissible chip size shall be 3.2mm (0.125 in.). Chips that are approximately the maximum permissible size shall not have a frequency greater than 1 chip per 0.4m2 (4.3 ft2) of sheet area. Chips less than 0.8
36、mm (0.031 in.) are to be disregarded unless they form a concentrated pattern thataffects serviceability. Chips from 0.8 mm (0.031 in.) to the maximum permissible size shall not have a frequency greater than 1per 0.4 m2 (4.3 ft2). Chips out of tolerance in size when knifed off are considered acceptab
37、le if the remaining blemish can beremoved by polishing, except for Finish 3 sheet which cannot be easily polished. For Finish 3 sheet, the maximum permissiblechip size shall be 4.75 mm (0.187 in.); all other requirements above apply except as noted.5.6.2.2 Chips in Sheet of Thicknesses Greater Than
38、51 mm (2.008 in.)Chips acceptable providing they do not extend morethan 0.4 mm (0.016 in.) above the surface.5.6.2.3 Dirt and ContaminantsThe maximum permissible dirt and contamination dimension shall be 3.2 mm (0.125 in.). Dirtand contaminants less than 0.8 mm (0.031 in.) shall be disregarded unles
39、s they form a concentrated pattern that affects theserviceability of the sheet. The maximum permissible frequency for dimensions ranging from 0.8 mm (0.031 in.) to the maximumpermissible for each type of sheet shall be 1 per 0.4 m2 (4.3 ft2) of sheet area for thickness up to and including 12.0 mm (0
40、.472in.). For Finish 3 sheet the maximum permissible dimension for dirt and contaminants shall be 4.8 mm (0.187 in.); all otherrequirements above apply.5.6.2.4 Other DefectsMinor defects, such as mold or handling scratches, or die lines that can be removed by polishing, shallbe permitted provided th
41、ese are not objectionable individually or in group patterns. Excluding side letgoes for masked andunmasked sheets in thicknesses greater than 51 mm (2.004 in.) and for unmasked sheets that are thicker than 6.0 mm (0.236 in.)up to and including 51 mm (2.004 in.), defects within 25 mm (0.984 in.) of t
42、he untrimmed edge of the sheet, that do notsignificantly reduce mechanical strength of the sheet, shall be permitted. Side letgoes for sheets thicker than 51 mm (2.004 in.)are permitted providing they do not extend more than 0.4 mm (0.016 in.) below the surface. Side letgoes for unmasked sheetsthick
43、er than 6.0 mm (0.236 in.) up to and including 51 mm (2.004 in.) shall be allowed within a 50 mm (1.97 in.) band from theuntrimmed edge of the sheet. For Finish 3 sheet, the maximum permissible length for mold scratches shall be 25 mm (0.984 in.);the maximum permissible length for medium or heavy ha
44、ndling scratches or abrasions shall be 50 mm (1.97 in.); the maximumpermissible length of light-handling scratches or abrasions shall be 153 mm (6.024 in.); and scratches or abrasions less than 6 mmshall be disregarded unless they form a concentrated pattern that affects the serviceability of the sh
45、eet. For Finish 3 sheet, themaximum permissible frequency for allowable scratches and abrasions as defined above shall be one per 0.4 m2 (4.3 ft2) of sheetarea.6. Sampling6.1 Unless otherwise indicated in Section 8 or Table 2, select a sample from a sheet 3.0 mm thick sufficient to determineconforma
46、nce of the material to this specification.TABLE 3 Permissible Thickness Variations for Category C-1 Cast Methacrylate Plastic SheetsNominal Thickness,mm (in.)APermissible Thickness Variation, mm (in.)Size 1B Size 2C Size 3D0.75 (0.030) +0.178 (0.007)E NAF NAF0.229 (0.009)1.0 (0.039) +0.152 (0.006)E
47、NAF NAF0.254 (0.010)D4802 153TABLE 2 Detail Requirements for Poly(Methyl Methacrylate) Acrylic Plastic SheetProperty Test Method CategoryA-1 A-2 B-1 B-2Tensile strength, min, MPa (psi) D638 62 (9.0 k) 62 (9.0 k) 62 (9.0 k) 62 (9.0 k)Elongation at break, min, % D638 2 2 2 2AIndex of refraction D542mi
48、n: 1.48 1.48 1.48 1.48Amax: 1.50 1.50 1.50 1.50Specific gravity D792min: 1.18 1.18 1.18 1.18Amax: 1.20 1.20 1.20 1.20Luminous transmittance, min, % D10034.5 mm (0.177 in.) #32 mm (1.259 in.) 89 89 89 8932.0 mm (1.259 in.)# 51.0 mm (2.000 in.) 87 87 87 87Spectral transmittance, max, % see 8.1.12Type
49、UVF only 200 to 390 nm 5 5 5 5All thicknessesType UVT only 290 to 400 nm(3.0 mm, 0.118 in.)290 nm 40 40 40 40310 nm 70 70 70 70340 nm 85 85 85 85400 nm 86 86 86 86Haze, max,% D1003 3 3 3 3Dimensional tolerance, max:Thickness, % see Table 3 10 5 5Length and width, mm (in.) 0.0, + 6.4 (0.0,+ 0.250)0.0, + 6.4 (0.0,+ 0.250)0.0, + 6.4 (0.0,+ 0.250)0.0, + 6.4 (0.0,+ 0.250)Shrinkage, max, % see 8.1.7 2.8 2.8 . .Transverse: . . 0.0 5.0Machine: . . 3.0 8.0Water absorption, % D570 (24-h method) see Fig. 1Fig. 1 . ADeflection temperature under
