1、MIL-DTL-24LSLD m 9999906 2024993 859 = DETAIL SPECIFICATION MIL-DTL-24191D(SH) 22 November 1996 SUPERSEDING 31 March 1981 (See 6.9) MIL-P-24191C(SH) PLASTIC SHEET, CELL OR CONTINUOUS CAST, ACRYLIC, SHIPBOARD APPLICATION (ILLUMINATION AND SIGNAL LIGHTING) This specification is approved for use by the
2、 Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scoi3e. This specification covers acrylic sheet material manufactured by the cell cast, continuous cast or melt (typically referred to as continuous
3、ly manufactured sheet) process. requirements of material classified “Melt process category M-1“ of ASTM D 4802. NOTE: Acrylic sheet material manufactured by continuous cast meets the 1.2 Classification. 1.2.1 Plastic sheet is of the following types, grades, and thicknesses as specified (see 6.2, tab
4、les I and III). Type RTPS-1 - Red transparent. Type RTPS-2 - Red transparent, smooth surface finish, one side; Type YTPS-1 - Yellow transparent. Type GTPS-1 - Green transparent. Type BTPS-1 - Blue transparent. Type BTPS-2 - Blue transparent, smooth surface finish, one-side; Type WTLS-2 - White trans
5、lucent (Grades A through G Type WTLS-3 - (see table III). Type WTLS-4 - -1 Type WTLS-1 Type RTLC-1 - Red translucent. Type CLEAR-1 - Clear (colorless). Type CLEAR-2 - Clear (colorless), smooth surface finish, one side; patterned pyramidal surface, second side. patterned pyramidal surface, second sid
6、e. patterned pyramidal surface, second side. r 1 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, SEA 031342, Naval Sea Systems Cominand, 2531 Jefferson Davis Hwy, Arlington, VA 22242-
7、5160 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 9330 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networ
8、king permitted without license from IHS-,-,-MIL-DTL-24LLD rn 9Ob 2024994 795 rn 1.2.2 White translucent sheet i$ of the type and grade specified in table I (see 6.2). The thickness in table I is a requirement of the type and grade specified. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed
9、in this section are specified in sections 3 and 4 ofthis specification. This section does not include documents in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users a
10、re cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. Not applicable. 2.3 Non-Government Publications. The following document(s) form a part Unless otherwise specified, of this
11、document to the extent specified herein. the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). Unless otherwise spe
12、cified, AMERICAN SOCIETY FOR TESTING AND MATERIALS ACTMI ASTM D 256 - ASTM D 542 - ASTM D 570 - ASTM D 635 - ASTM D 648 - ASTM D 788 - ASTM D 790 - ASTM D 792 - ASTM D 1003 - ASTM D 1925 - ASTM D 2843 - ASTM E 167 - ASTM E 308 - Impact Resistance of Plastics and Electrical Insulating Materials, Stan
13、dard Test Methods for. Index of Refraction of Transparent Organic Plastics, Standard Test Method for. (DoD adopted) Water Absorption of Plastics, Test Methods for. ( DoD adopted) Rate of Burning and/or Extent and The of Burning of Self-supporting Plastics in a Horizontal Position, Test Methods for.
14、(DoD adopted) Deflection Temperature of Plastics Under Flexural Load, Standard Test Method for. (DoD adopted) Poly (Methyl- Methacrylate) (PMMA) Molding and Extrusion Compounds, Standard Classification System for. Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating
15、Materials, Standard Test Methods for. Density and Specific Gravity (Relative Density) of Plastics by Displacement, Standard Test Methods for. Haze and Luminous Transmittance of Transparent Plastics, Standard Test Methods for. (DoD adopted) Yellowness Index of Plastics, Standard Test Methods for. Den
16、sity of Smoke from the Burning or Decomposition of Plastics, Standard Test Method for. (DoD adopted) Goniophotometry of Objects and Materials, Standard Recommended Practice for. (DoD adopted) Computing the Colors of Objects by Using the CIE System, Standard Test Method for. (Application for copies s
17、hauld be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this doc
18、ument, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24LSLD 06 202q995 621 MIL-DTL-24191D(SH) 3. REQUIREMENTS 3.1 First article. When speci
19、fied (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.3. during production shall consist of the inspection specified in 4.5. 3.2 Materials. The material shall be methacrylate base plastic, manufactured and processed so as to conform to all the requirements of t
20、his specification (see 6.2). CLEAR-2. Flat sheets shall have a smooth surface finish on both sides. 3.1.1 pualitv conformance inspection. Quality conformance inspection 3.2.1 Surface finish for all types except for RTPS-2, BTPS-2 and 3.2.2 Surface finish for RTPC-2. BTPS-2 and CLEAR-2. Type RTPC-2,
21、BTPS-2 and CLEAR-2 flat sheets shall have a smooth surface finish on one side and a patterned pyramidal surface on the other side which shall consist of a uniform array of 64 square pyramidal prisms per square inch, each with an included angle of 118 2 2 degrees at the apex and approximately 0.021 i
22、nch high. 3.3 Dimensions. 3.3.1 Lenath and width. Length and width of sheets shall be as specified in the contract or order (see 6.2). window assemblies of specific shape as specified in the equipment specifications of lighting fixtures shall be as specified in the contract or order to suit contract
23、ors fabrication procedures (see 6.1 and 6.2). Unless otherwise specified in the equipment specifications for lighting fixtures, thickness tolerance of flat sheets which are only cut to specified dimensions without further forming to specific shapes shall be as shown in table I. Thickness of type RTP
24、S-2, BTPS-2 and CLEAR-2 shall be measured from the flat smooth surface to the vertex of the prisms. 3.3.2 Thickness. Thickness of flat sheets that are used to fabricate TABLE I. Nominal thickness. thickness tolerance and formabilitv diameter. Thickness tolerances (inch) I 1 Nominal thickness (inch)
25、I/ All types and grades except RTPS-2, BTPS-2 and CLEAR-2 - 2/ 0.060 - 0.080 0.100 O. 125 O. 150 0.187 0.220 0.250 +O. 015 -0. o19 +O. 014 -0.020 +Oe013 -0.021 +O. 015 -O. 025 +o. o19 -0 6 031 +O. 017 -O. 033 +o. 020 -0.040 +o. 020 -0.040 RTPS-2, BTPS-2 and CLEAR-2 3/ only - - - +O. 045 -0.015 - +O.
26、 043 -0 - 027 - +0.045 -0.020 Formability diameter (inches) (heated) 1.5 2.0 2.5 3.1 3.8 4.7 5.5 6.3 See footnotes at top of next page. 3 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- i/ 0.030, 0.100, 0.150, and 0.220 inch nominal thickness not
27、available for - 2/ 0.060 inch nominal thickness not available in types GTPS-1, BTPS-1, and J/ Not available in thicknesses 0.060, 0.080, 0.100, 0.150, and 0.220. type WTLS-1 through 4. RTPS-1. TABLE II. Flammability characteristics. Characteristic Flammability rate Smoke density rating Test specimen
28、 5 length x 1/2 width x 1/4 thickness 1 length x 1 width x 1/4 thickness (inches) L/ , Applicable test method ASTM D 635 ASTM D 2843 - i/ A test,specimen shall be made to the dimensions shown from the same batch of material offered for delivery. Limit 1.35 maximum inches/minute 50 maximum 4 Provided
29、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-DTL-24191D 9999906 2024997 4T4 MIL-DTL-24191D(SH) m JJ al al U c a O o) rl Irsnr O 2; (d OC 4J4J4J a -4 0 3; alm VNa al c cal a al a that is, no special conditioning shall be required unless otherwise spec
30、ified in the test procedure. 4.6.1.2 Test thickness. Tests shall be made on sample sheets of nominal thickness shown in table I. If sample sheets are tested other than at the nominal . thickness, the test results shall be adjusted to the nominal thickness. 4.6.1.3 Test samples for tvpes RTPS-2, BTPS
31、-2, and CLEAR-2. Test samples for RTPS-2, BTPS-2, and CLEAR-2 shall be prepared by either of the following methods : (a) (b) The patterned surface shall be ground down to tie nearest nominal thickness shown in table I and polished to a smooth surface. The test specimen shall be cast with a smooth su
32、rface finish on both sides to the nearest nominal thickness shown in table I from the same batch material as that used for the production sheets under test. 4.6.2 Specific aravitv. The specific gravity of the niaterial shall be determined in accordance with ASTM D 792. 4.6.3 Deflection temperature u
33、nder load. Conditioned test specimens shall be tested. The length of the specimen shall be 5 inches, the depth shall be 0.5 2 0.005 inch, and the width shall be the thickness of the original sheet. Thin sheet materials, less than 0.125 inch (namely 0.060, 0.080 and 0.100 inch) shall. . be arranged t
34、o form a composite specimen of convenient thickness. The apparatus shall be similar to ASTM D 648. The conditioned specimen shall be supportedas a simple beam on steel supports 4 inches apart with the load applied verticqlly on the top of the specimen midway between the supports. The 1/2-inch dimens
35、ion or depth of the beam shall be vertical. The load applied shall be governed bythe width of the specimen and shall in each case induce in the specimen a maximum outer fiber stress of 264 lb/in2. The loads applied for typical specimens are as follows : Specimen Load aDwiied midwav between the suppo
36、rts 1/4 by 1/2 by 5 inches 1/8 by 1/2 by 5 inches 2.75 pounds 1.38 pounds 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-DTL-2YLSLD m 9999906 2025002 4bT m The test specimens shall be in direct contact with a suitable liquid heat transfer med
37、ium, liquid petroleum USP, which is agitated during the test. The temperature of liquid shall be raised from normal room temperature at a rate of 3.6 2 0.9“F per minute. at which the specimen shall deflect 0.010 inch at the center between the supports. The heat distortion temperature shall be consid
38、ered the temperature 4.6.3.1 Sheets made bv the extrusion wrocess of the continuous cast. Extrusion process shall be tested for deflection temperature under load in accor- dance with the conditioning of test specimens specified for grade 8 material of ASTM D 788. . For 1/8 inch specimens: 185F For 1
39、/4 inch specimens: 185F The 2 hour period shall be applicable to the sheets of 0.060, 0.080, 0.100 and 0.125 inch thickness. 0.150, 0.187, 0.220 and 0.250 inch thickness. be determined in accordance with the water absorption test (for weight and dimensional changes) of ASTM D 570. shown in table II.
40、 . The 4 hour period shall be applicable to the sheets of 4.6.4 Water absorwt ion. The percentage of water absorbed in 24 hours shall 4.6.5 Flammability. Tests shall be conducted in accordance with methods 4.6.6 Flexural strenath (tested flatwise),. The flexural strength shall be determined in accor
41、dance with ASTM D 790. 4.6.7 Imwact strenath. Test for impact.strength shall be performed in accordance with ASTM D 256, method A. Specimens shall be tested edgewise. 4.6.8 Tests for owtical properties. Tests for optical properties shall be 4.6.8.1 Tvw esRTPS-l. RTPS-2, YTPS-1. GTPS-1. BTPS-1, BTPS-
42、2, and RTLS-I. as specified in 4.6.8.1 through 4.6.8.3. Tests for color and luminous transmittance for types RTPS-1, RTPS-2, YTPS-1, GTPS-1, BTPS-1, BTPS-2, and RTLS-1 shall be conducted in accordance with ASTM E 308. The tests shall be conducted using illuminant A. specified in 4.6.8.2.1 through 4.
43、6.8.2.3 using CIE illuminant C. conducted in accordance with ASTM E 308 using the Hardy-type spectrophotometer. Other apparatus is satisfactory if equivalent results are obtained. 4.6.8.2.2 Yellowness index. Yellowness index tests shall be conducted in accordance with ASTM D 1925. 4.6.8.2 TvDe WTLS-
44、1 throuah 4. Grades A throuah G. Tests shall be as 4.6.8.2.1 Luminous transmittance. Luminous transmittance tests shall be 4.6.8.2.3 Diffusion factor and filament hidina Dower. Diffusion factor (DF) and filament hiding power (FHP) of a material, when illuminated by parallel light incident normally t
45、o the specimen, are defined by: DF = B 20 -+ B 70 Where : B = Brightness at the normal (straight through) view angle. Bo = Brightness at a view angle 2 degrees from normal. B2 = Brightness at a view angle 5 degrees from normal. B5 = Brightness at a view angle 20 degrees from normal. B: = Brightness
46、at a view angle 70 degrees from normal. , 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-DTL-24191D H Ob 2025003 3Tb This specimen shall be viewed from the side opposite to that on which the light is incident, and measurements shall be made o
47、n a goniophotometer using appropriate instrumentation for recording brightness in accordance with ASTM E 167. Diffusion factor and filament hiding power shall be calculated using the above formulas. 4.6.8.3 Tvpe CLEAR-1 and CLEAR-2. One specimen each shall be tested as specified in table IV. heating
48、 the material in accordance with the suppliers instructions and by bending it into cylindrical forms of the diameter specified in table I. 4.6.9 Formabilitv. The formability of the material shall be determined by 5. PACKAGING 5.1 Packaainq. For acquisition purposes, the packaging requirements shall
49、be as specified in the contract or order (see 6.2). When actual packaging of materi81 is to be performed by DoD personnel, these personnel need to contact the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are maintained by the Inventory Control Points packaging activity within the Military Department or Defense Agency, or within the Military Departments System
