1、- ._ - - 1 MIL-M-432YC 73 7999706 OLL9557 2 = / V made with above All grade A When specd I, II I, II I II Sta- Permissible tistic deviation ZL percent 3/ + 12 + 20 - X Xi - + 20 4/ - none Xi Xi none . Xi 30 lbs. min. + 30 Xi - - - X 90 max. X 300 min. AQL percent Pass 6/ 4 Pass .!Y 1 Pass 6/ Pass 6/
2、 1 1 Pass 6/ Pass 6/ Test method paraq raph 4.4.4 4.4.4 4.4.4.1 4.4.5 4.4.5 4.4.5 4.4.6 4.4.7 4.4.8 4.4.8 - i/ When specified, any of the listed requirements shall be deleted, applied to other classifications of mat, or modified (see 6.2, 6.6, 6.7, and 6.9). - 2/ - Average of all specimens tested fo
3、r that property xi - Individual specimen value (see 4.3.8.2). .- 3/ Of nominal value (see 6.2), unless otherwise indicated. - 4/ Single determination. - 5/ 2 75 percent of nominal or f_ 2.5 percent absolute, whichever is smaller. % - 6/ Each specimen tested shall pass. 6 Provided by IHSNot for Resal
4、eNo reproduction or networking permitted without license from IHS-,-,-MIL-M-LI32LIC 73 W 7777706 OLL7563 = MI L-M-4 32 4 8C 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the con- tract, the contractor is responsible for the performance of all inspec
5、tion requirements as specified herein. Except as otherwise specified in the con- tract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perf
6、orm any of the inspection set forth in the specification where such inspections are deemd necessary to assure supplies and services conform to prescribed requirement s. 4.1.1 Users examination. Additional examination by the user, after acceptance and delivery of the lot, with permissable rejection o
7、f individual defective rolls, is provided under 4.3.3.3. 4.2 Lot. For purposes of sampling and inspection, a lot shall consist of all mats of the same type, class, grade, construction, an weight, submitted for delivery at the same time. 4.3 Sampling and inspection. 4.3.1 Materials and components. In
8、 accordance with 4.1, the suppliers shall be responsible for assuring that all materials and components used have been inspected and found to conform to all applicable requirements of this specification and, to the extent specified herein, of referenced specif i- cations and standards. In case of co
9、nflict, this specification shall govern. The suppliers certificate of compliance with 3.1.2 shall be furnished. 4.3.2 Width. A sample of rolls of mat shall be inspected for width in accordance with table 11. Unless otherwise specified, or unless visual inspection of the rolled mat indicates that the
10、re may be a systematic vari- ation in width along the length of a roll, the width of each roll in the sample shall be measured at a location just below the outer convolution of the rol 1. Table II. Inspection for width of mat Lot size, rolls 1-150 151-500 501-1200 1201-3 20 O Sample size, rolls 13Ll
11、 50 80 . 125 Acceptance no., rolls O 1 2 3 - i/ If the sample size exceeds the number of rolls in the lot, each roll in the lot shall be sampled. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-M-4324C 93 i p999706 0339564 T MIL-M-4 3248C 4.3
12、.3 Lemth and visual defects (major and minor, not specified weave; facing not applied to one or both sides as specified; facing not bonded to backing (see 3.2.6) Suppliers certificate missing or improper (see 3.1.2) Grade A specimen fuses during ignition of 4.4.5.1 (see table I) When color (or freed
13、om from color) is specified, specimen of 4.4.5.4 shows improper color 4.4.3.1 4.4.3.1 Visual 4.4.3.2 ,ATisual As specified 4.4.3.2 Visual Visual 4.4.3.2 13 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-LI32LIC 73 9 7777906 OLL7570 5 W MI L-M-
14、4 324 86 4.3.7 Examination of packaging. An examination shall be made, in accordance with table VI to determine that preservation, packing and markings comply with the requirements of section 5 of this specification. unit for this examiqation shall be one ,shipping container, fully packed, selected
15、just prior to the closing operation. Shipping containers fully pre- pared for delivery shall be examined for closure defects. examination in table IV shall be 4.0 using level III of MIL-STD-414. The sample The AQL for each Table VI. Examination for packaging Examine Defect Preservation Packing Count
16、 We ig ht Markings Not level specified; not in accordance with contract requirements. Rolls not unit or intermediately packed as specified. Unit or intermediate packing material not as specified; closures not accomp- lished by specified or required methods or materials. Not level specified; not in a
17、ccordance with contract requirements. Any nonconforming component; component missing, damaged or otherwise defective affecting serviceability. Container not as specified; closures not accomplished by specified or required methods of materials. Inadequate application of components, such as: Incomplet
18、e closures of case liners or container flaps, loose or inadequate st rappings, bulged or di st or t ed conta iner s. Less than specified or indicated quantity of rolls per shipping con- ta iner s. Gross or net weight exceeds specified requ i remen t s. Interior or exterior markings (as applicable) o
19、mitted, illegible, in- correct, of improper size, location or sequence or method of application. Not in accordance with contract re- qui reme nts. 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIGM-4 3248C 4.3.8- Testinp. 4.3.8.1 Number of speci
20、mens. One specimen from each sample unit of 4.3.5 shall be subjected to each applicable test of table I, except that: a. Only one specimen of type V mat shall be tested in accordance with 4.4.4.1. b. The number of specimens tested for color and resistance to fusion shall be in accordance with 4.3.6.
21、 C. When applicable, 5 specimens shall be subjected to the test of 4.4.8. If the average value is outside the required range, 5 additional specimens may be tested at the discretion of the supplier. The lot shall be considered to have passed this test if either the 5 specimen or the 10 specimen avera
22、ge meets the requirement. d. The number of specimens tested for the following properties shall be not less than shown as follows: Minimum number of Property determinations Mat weight (see 4.4.4) 10 Weight loss on ignition (4.4.5) when required Tensile strength (4.4.6) when required Thickness (4.4.7)
23、 when required 5 5 10 When the number of sample units in the lot is less than the number of specimens required for any property, two or more specimens shall be tested for that property from the same sample units. 4.3,8.2 Calculations. When “X“ is required (see table I), the values for the property s
24、hall be averaged and the average value shall be reported. When the AQL based on “Xi“ of a property is required, both the average and the standard deviation shall be calculated. From those statistics, comformity of the lot to the requirement shall be determined in accordance with HIL-CTD-414, Section
25、 B-II (variability unknown, standard deviation method, double speci- fication limit). 15 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-il-4324C 73 m 7779706 OLL7572 7 m MIL-M-43248C 4.4 Tests and examination for construction. 4.4.1 Conditions.
26、 Unless otherwise specified or permitted (see 4.4.5.2), all weighings shall be performed and the test for tensile strength shall be conducted at a temperature of 23O 2 2OC (73.4O 2 3.6OF). subjected to any test, each specimen shall b reasonably dry. In cases of dispute, the specimen shall be conditi
27、oned to equilibrium and tested at the above temperature and at a relative humidity of 50 2 5 percent. Before being 4.4.2 Glass composition. Unless otherwise specified, the composition of the glass shall be assumed to be that certified by the supplier (see 3.1.2), except that fusing of the specimens
28、of 4.4.5.1 shall be considered evidence that the mat is not made of “E“ glass, and excessive color in the ignited specimens shall be cosidered evidence that the mat is not “clear glass“ (see 6.8.1). 4.4.3 Comparison standards. 4.4.3.1 Filament and strand. A rough estimate of the filament and strand
29、construction of the mat shall be made by visual comparison against a standard. The standard shall consist of a sample of the particular desig- nation of mat specified, supplied by the manufacturer and approved by the pro- curing agency, or furnished by the inspecting agency. Conformity of a stan- da
30、rd furnished by the inspecting agency shall be determined by pulling out a minimum of 20 filaments and by measuring the diameter of each by means of a microprojector or other suitable means, by counting the number of filaments in a sample of representative strands, and by measuring the lengths of a
31、suf- f icient number of chopped strands to determine the approximate average length, maximum and minimum length, and the length distribution. Because there always will be some variation in diameter between the filaments in a strand, and be- cause there always will be some disintegration of strands d
32、uring the pro- cessing of the mat, this visual comparison can detect only gross departures from certified constructions (see 4.3.6 and table V). 4.4.3.2 Other mat construction features. When standards are required for other visual comparisons, such as type of needling of type III mats, weaves of typ
33、e V backings, or color of ignited specimens, these standards shall be pro- vided and verified in a manner similar to that described in 4.4.3.1, but using the specified characteristics. The construction of the backings of type V mats shall be verified after removal of the randm strand facing(s), as i
34、n 4.4.4.1. 16 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-LI324C 73 777770b 0119573 O W MIL-M- 4 2 3 4 8C 4.4.4 Mat weight. Each applicable specimen of 4.3.5 and 4.3.8 shall be individually measured to the nearest 0.1 inch of length and wid
35、th (or diameter if round (see 6.9.4) ) , and weighed to the nearest 0.5 percent of its weight. Its unit weight, in ounces per square foot, shall be calculated. Calculations will be simplified if each specimen is cut 12 5 0.1 inches square and if the weighing is performed on a balance or scale readin
36、g in ounces, since in that case the dimensions need not be remeasured and the weight of the specimen will be equal to its unit weight in ounces per square foot. The average unit weight and conformity to the specified AQL for individual specimens shall be calculated in accordance with 4.3.8.2. 4.4.4.
37、1 Weiqht of mat layers and verification of hacking construction. For type V mats, the weight of each layer shall be determined as follows: The weights of the undivided type V mats shall be determined in accordance with 4.4.4, using 12 2 0.1 inch square specimens. The specimen which had the weight ne
38、arest to the average shall be split into its component layers by means of careful cutting and pulling, leaving as little random strand attached to the backing as possible without damaging the backing. Each random strand layer shall be weighed separately and its weight in ounces shall be reported. Th
39、e construction of the backing shall be verified in accordance with 4.4.3.2. 4.4.5 Percent weight loss on iqnition and glass composition. 4.4.5.1 Grade A. Each applicable specimen of grade A mats (see table I, 4.3.5, 4.3.8 and 4.4.5.3) shall be weighed to a precision of 5 0.5 percent or better, ignit
40、ed in a muffle furnace at 625O 2 25OC (1157O 2 45OF) to constant weight and similarly reweighed. be calculated as: Its percent loss on ignition shall (100) (weight loss) (initial weight of specimen) The ignited specimen shall be examined for fusing together of the filaments (see table I and V and 4.
41、4.2). 4.4.5.2 Grade B. When the mat is specified to be made of a glass having a lower fusing temperature than “E“ glass, a lower ignition temperature, as specified by the procuring activity shall be used (see 6.2 and 6.8.1). 4.4.5.3 Specimens. When suitable equipment is available, specimens shall be
42、 one square foot and all weighings shall be made while the specimen is in the furnace. The furnace and weighing equipment shall be constructed so as to prevent errors from convection currents. available, each specimen shall consist of a piece, full thickness) of the mat weighing not less than 5 gram
43、s. necessary, shall be placed in a previously ignited, cooled, and weighed por- celain crucible, weighed, ignited to constant weight, cooled in a desiccator, and reweighed. When this special equipment is not Each specimen, cut into smaller pieces if 17 Provided by IHSNot for ResaleNo reproduction or
44、 networking permitted without license from IHS-,-,-MIL-M-43248C 93 999990b 0339574 2 MIL-M-43248C 4.4.5.4 Color after ignition. When the glass, after ignition, i5 specified to have a particular color or absence of color, the ignited specimens of 4.4.5.1 or 4.4.5.2 shall be compared with color standa
45、rds (see table V). I 4.4.6 Tensile strength. Each specimen (see 4.3.5 and 4.3.8) shall be 12“ by 12“ and shall be clamped between two pairs of flat-faced grips each not less than 12 inches long in such a manner that 1 inch 5 1/8 inch of the specimen is within each grip, 10 inches 2 1/4 inch is betwe
46、en the grips, the edges of the two pairs of grips are parallel and the longitudinal (machine) direction of the mat is parallel with the 10 5 1/4 inch dimension. Using a suitable tension testing machine, the grips shall be pulled apart at such a rate as to cause failure of the specimen in between 5 a
47、nd 15 seconds. The load in pounds required to cause failure of each specimen shall be recorded. Conformance to specified requirements shall be determined in accordance with 4.3.8.2. 4.4,7 Thickness. Each applicable specimen (see table I, 4.3.5, 4.3.8, and 6.7), shall be tested for no-load thickness
48、as follows: The specimen shall consist of aone foot square piece full thickness of the mat and may be the same specimen as that tested under 4.4.4. It shall be placed on a flatsteel surface larger than itself. A flat steel plate 1/8 inch thick and one foot square shall be determined by means of a di
49、al gage having its base resting on the surface and its presser foot resting on the center of the plate. The pressure exerted by the mechanism of the reading instrument shall be negligible in relation to the weight of the plate. The dial gage may be zeroed either with the plate resting directly on the surface, thereby reading thickness directly, or with the plate separated from the surface by a distance equal to the nominal
