1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-
2、25042B Manufacturing Chemists Association, Inc. Manual L-1 Guide to Precautionary Labeling of Hazardous Chemicals (Sixth Edition- 196 1) (Application for copies should be addressed to the Manu- facturing Chemists Association, Universal Building, 1825 Connecticut Avenue, Washington, D. C. 20009.) 3.
3、REQUIREMENTS Preproduction - The resin furnished under this specifi- cation shall be a product which has been subjected to and has passed the prepro- duction inspection specified herein. One-year weathering data - As part of the preproduction requirement, the supplier shall submit certified data sho
4、wing that a glass cloth base plastic laminate, fabricated as specified in 4.3.1.1 from the resin to be furnished under this specification, has been exposed to outdoor weathering in accordance with 4.5.5 for a period of one year and has subsequently met the applicable requirements of Table I. The dat
5、a shall identify the geographical location in which the outdoor weathering was accomplished. Materials - The materials used in the manuhcture of the resin shall be of high quality and as specified herein. The resin shall be of the polyester, thermosetting, low pressure laminating type. The component
6、 materials of the resin shall be such that the cured resin shall not be corrosive to metals. Form - The resin shall be in a form (liquid or solid) suitable for impregnatng or may be furnished already impregnated on glass fabric (pre-impregnated). It shall be free from foreign materials. Chemical typ
7、e - The supplier shall designate the polyester base and the cross-linking agents (see .3.9 L (d) + Code number - The supplier shall designate each resin composition by a code number that shall be used to identify the resin. The code number may include trade name if desired. Any changes in the compon
8、ents or manufacturing procedures shall necessitate use of a different code number. For pre-impregnated materials, those materials using the same resin but having different properties due to different impregnating conditions shall have different designations. The designation shall consist of the resi
9、n code number with a suffix indicating impregnating conditions. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2?. , 3.7 Mechanical and physical properties of the laminate -I The mechanical and physical properties of a glass cloth base plastic lamin
10、ate, fabri- cated as specified in 4.3. l. l shall conform to the values listed in Table I. 3.8 Electrical properties of the laminate (Classes 1 through 4 only) - The electrical properties of a glass cloth base plastic laminate, fabricated as specified in 4.3.1.2, shall conform to the values listed i
11、n Table II, (See also 6.2 (e) and 6.3.) 3.9 Instruction sheet - 3.9.1 For liquid or solid resin - Unless otherwise specified, the-supplier shall provide for each unit package of resin an approved instruction sheet containing the following information: (a) Grade and class of the resin and the number
12、of this specific ation. (b) Resin code number (3.5). (e) The form of the resin (3.3). (d) Chemical type of the resin (3.4). (e) Limiting values required in 3.6 for the uncataiyzed resin, catalyzed resin, and cured unfilled resin; also the test procedures when not specified herein. (0 Dielectric cons
13、tant (nominal) and loss tangent (nominal) of the cured unfilled resin, Classes 1 through 4 only (3.6). (g) Maximum usable storage life of the resin (uncatalyzed and catalyzed) and recommended storage conditions. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license f
14、rom IHS-,-,-MIL-R-250Lt2B 73 m 7999706 OlL90b2 U TABLE I MIL-R-25042B LENGTHWISE MECHANICAL AND PHYSICAL PROPERTIES OF GLASS CLOTH BASE PLASTIC LAMJNATE L/ (Unless otherwise specified, ail values are minimum for the average of five specimens) Test Method except as noted) Property (FED-STD-406 Method
15、 Nos. Requirements 21 TESTED UNDER STANDARD CONDITIONS (see 4.5.1) Flexural properties, flatwise - psi Ultimate strength Initial modulus of elasticity Ultimate tensile strength, psi Ultimate compressive strength, edgewise, psi Flammability, inches per minute Water absorption, 24 hours immersion, per
16、cent change in weight , Barco1 hardness Specific gravity Resin content, percent 1031 (Specimen size 1 by 4 inches) 1011 (Type 2 specimens) 1021 (Specimen size 3-1/8 by 1/2 inches) 2021 7031 (see 4.6.4) 5011 or 5012 7061 TESTED WET (see 4.5.2) Flexural properties, flatwise, psi Ultimate strength Init
17、ial modulus of elasticity Ultimate tensile strength, psi Ultimate compressive strength, edgewise, psi 48,000 2.8 x lo6 35,000 30,000 1.0 (ma) +3.3 (max) (Specimen size 1 by 4 43,000 I inches) 2.4 x lo6 1011 (Type 2 specimens) 33,000 1021 28,000 (Specimen size 3-1/8 by 1/2 inches) TESTED AT 260 C AFT
18、ER EXPOSURE TO 260 C FOR 1/2 HOUR (see 4.5.3) Flexural properties, flatwise, psi Ultimate strength Initial modulus of elasticity Ultimate tensiie strength, psi Ultimate compressive strength, edgewise, psi 1031 (Specimen size 1 by 4 inches) 1011 (Type 2 specimens) 1021 (Specimen size 3-1/8 by 1/21 30
19、,000 2. o x 106 18,000 15,000 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-25042B TABLE I (Continued) Test Method except as noted) Property (FED-STD-406 Method Nos. Requirements 2/ TESTED AT 260 C AFTER EXPOSURE TO 260 C FOR 192 HOURS (see 4
20、.5.3) Flexural properties, flatwise, psi 1031 Ultimate strength (Specimen size 1 by 4 17,000 Initial modulus of elasticity inches) 1.5 x 106 TESTED AFTER IMMERSION IN CHEMICAL FLUIDS (see 4.5.4) MIL-H-5606, Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance Percent change in weight (inc
21、rease or decrease) Percent change in thickness (increase or decrease) Ultimate flexural strength, psi TT-1-735 Isopropyl Alcohol Percent change in weight (increase or decrease) Percent change in thickness (increase or decrease) Ultimate flexural strength, psi TT-S-735 Standard Test Fluids, Hydrocarb
22、on, Type III Percent change in weight (increase or decrease) Percent change in thickness (increase or decrease) Ultimate flexural strength, psi (Specimen size 1 by 4 inches) 7011 2.0 (rnax) 7011 O. 2 (rnax) 1031 43,000 (Specimen size 1 by 4 inches) 7011 2.0 (max) 7011 O. 1 (mu) 1031 43,000 (Specimen
23、 size 1 by 4 inches) 7011 2. O (ma) 7011 O. 2 (ma) 1031 43,000 TESTED AFTER 1 YEAR OF OUTDOOR WEATHERING (see 4.5.5) I Flexural properties, flatwise, psi 1031 Ultimate strength (Specimen size 1 by 4 43,000 Initial modulus of elasticity inches) 2.4 x lo6 NOTES: L/ Lengthwise direction of test specime
24、ns is parallel to .varp direction of glass fabric. - 2/ The specimens shall show no cracking, crazing, softening, delamination, nbr any other visible deterioration after conditioning exposures or immersions. - 3/ There are no requirements for these properties. However, the values should be determine
25、d and reported. Calculations for ultimate flekral strength after immersion in chemical fluids shall be based on the dimensions of the specimens before immersion. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-ZSOLIZB 93 M 9799906 OlL9Obi L M
26、 - MIL-R- 25042B TABLE II ELECTRICAL REQUIREMENTS FOR GT,ASS CLOTH BASE PLASTIC (Values reported shall be the average of the determinations made on a minimum of 3 specimens. ) (CLASSES 1-4 ONLY) LAMINATES AT 8,500 - 10,000 MEGACYCLES r/ Standard conditions (4.5.1) Immersion condi- tions (4.5.6) High
27、 temperature range (4.5.3) Dielectric constant As specified for the applicable class (1.2) Not greater than 5 percent in- crease over the value at standard conditions t-3. O percent (rnax) change from value at standard conditions Loss tangent 0.020 (max) 0.025 (max) 0.045 (max) - i/ “X-bandfl freque
28、ncy range. The recommended test frequency for this band is 9,375 mcs. (See also 6.3. ) (h) Recommended mixing and impregnating procedures, in- cluding recommended types, percentages and manner of utilization of catalysts and retardants. (i) Recommended finishes to besused on glass fabric. (j) Maximu
29、m allowable shelf life at various temperatures of impregnated fabric before curing. I (k) Range of time, temperature and pressure cycles recommended to effect the cure for laminates. (l) Any other pertinent information, at the suppliers option, on storage and handling. 3.9.2 For pre-impregnated mate
30、rial - An instruction sheet for the pre-impregnatedform shallbe preparedas specified in 3.9.1 except that the following information, with description of the method of determining . . the properties shall be substituted for items (a) through (i) of 3.9.1. c -= 1 (a) Grade and class of the resin and t
31、he number of this I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(b) Material designation (3.5). (c) Form of the resin (3.3). (d) Chemical type of the resin (3.4). (e) Dielectric constant (nominal) and loss tangent (nominal) of the cured unfilled
32、resin component, Classes 1 through 4 only (3.6). (f) Volatile content (average and tolerance) (3.6). (g) Dry resin content (average and tolerance) (3.6). (h) Flow (average and tolerance) (3.6). 3.10 Workmanship - The material specified herein shall be processed as required in accordance with the bes
33、t practice for a high quality resin. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection - Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, th
34、e supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the itlspections set forth in the specification where such inspections are deemed neces- sary to assure supplies and services conform to prescribed
35、 requirements. 4.2 Classification of inspections - The inspections performed under this specification shall be of the following classifications: (a) Preproduction inspection (4.3). (b) Quality conformance inspection (4.4) 4.3 Preproduction inspection - Preproduction inspection shall include all the
36、examinations and tests of this specification except the one year outdoor weathering test (4.5.5), for which certified test data shall be submitted by the supplier (3.1. i), and the examination of preparation for delivery (4.6.11). Unless otherwise specified (4.3.2), no material shall be offered for
37、acceptance under any contract or order until the preproduction samples prescribed in 4.3.1 have been subjected to preproduction inspection 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-and pronounced satisfactory by the procuring activity. Howeve
38、r, approval of the preproduction samples or of acceptable test data (4.3.2) in lieu thereof shall not relieve the supplier of his obligation to meet the quality conformance . . . . *_._ I and materials shall be submitted by the supplier for preproduction test: Two copies of the certified weather res
39、istance data specified in 3.1.1. Two copies of the instruction sheet specified in 3.9. One gallon of liquid or dry resin; or eight square feet, full fabric width, of pre-impregnated resin fabric as applicable, dependent on the form of resin supplied. (d) A 2 foot by 2 foot glass cloth base laminate
40、sheet O. 125 +-O. O10 inch thick (see 4.3.1.1) or five sheets, each one foot square, of that thickness for determining mechanicd and physical properties of the laminate, Unless otherwise specified in the contract or order, this sheet shall be processed by the supplier into the required number of tes
41、t specimens for all mechanical and physical tests, machined to size and suitable for testing. (e) A 4 inch by 8 inch glass cloth base laminate sheet at least O. 75 inch thick (see 4.3.1.2) for tests of electrical properties (Classes 1 through 4 only), e- V The laminate sample for mechanical and phys
42、ical tests shall be fabricated in the form of a sheet or sheets O. 125 *O. 010 inch in thickness, using the resin which is under test and 12 plies, laid up parallel, of 181 glass cloth conforming to MIL-C-9084 for finished cloth. The sample shall be laminated at a pressure not exceeding 30 pounds pe
43、r square inch and shall be fully cured in accordance with the resin suppliers instruction sheet. The sample shall be essentially void free and representative of the best quality workmanship and shall have a resin content by weight that will produce a laminate with optimum properties. Specimens from
44、this laminate shall be tested to determine conformance to the mechanical and physical requirements of 3.7. b Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-25042B 4.3.1.1.1 Base fabric for pre-impregnated laminate samples - Unless otherwise sp
45、ecified, the laminate prepared for preproduction4ests of pre-impregnated materials shall be fabricated with 181 glass clath, regardIess of the base cloth to be used in the actual delivery of prelimpreg- nated resin. This substitution shall apply to the laminate samples only, not to the pre-impregnat
46、ed samples of 4.3.1 (c) or 4.4.1.2. . 4.3.1.2 Laminae sheet for electrical property tests - The glass fabric base, resin contelit, specific gravity, finish, and other physical characteristics of the laminate sample for electrical test (4.3.1 (e) shall be the same as those of the laminate fabricated
47、fn accordance with 4.3.1.1. The laminating procedure shall follow, as closely as practical, the procedure used in 4.3.1.1. 4.3.2 Preproduction inspection in repeat orders - In repeat orders-or orders for .different parts, the requireme 4.6.3 Acid number - The acid number of the liquid uncatalyzed re
48、sin shall be determined in the following manner: The acid number of a poly- ester is defined as the milligrams of potassium hydroxide required to neutralize 1 gram of polyester. It is determined by titrating a suitable sample of the material as a solution in neutral acetone with O. 1 normal potassiu
49、m hydroxide using phenolphthalein as in indicator. Other methods may be used but shall be described in the instruction sheet (3.9). 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
