1、27 July 1979 SUPERSEDING pertinent data which may be of use in improving this document should be addressed to the Aeronautical System8 Division, ENESS, W-PAFB, Ohio 45433 by using the self-addressed Standardization Improvement ,Proposal (DD Form 1426) appearing at the end of this document or by MIL-
2、F-87121 (TJSAF) 7 April 1979 MILITARY SPECIFICATION FABRIC, GRAPHITE FABRIC This specification is approved for use by the Air Force Materials Laboratory, MXA, Department of the Air Force, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This
3、specification covers the materials requirements and quality assurance provisions for an eight harness satin weave graphite fabric. 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified
4、 herein. SPECIFICATIONS The following documents of the issue in MILITARY MIL-C-45662 Calibration System Requirements MIL-Y-87125 Yam Graphite, 1000/3000 Filaments STANDARDS FEDERAL FED-STD-191 Textile Test Methods kter . I FSC 8305 ., . L. Provided by IHSNot for ResaleNo reproduction or networking p
5、ermitted without license from IHS-,-,-MIL-F-8722LA 83 W 777770b 0441620 Li -. t- MILITARY MIL-STD-129 . MIL- STD-13 O Marking For Shipment and Storage Identification Marking of U.S. Military Property (Copies of specifications, standards, drawings, and publications required by contractors in connecti
6、on with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following documents forms a part of this specifjcation to the extent specified herein. indicated, the issue in effect on dat,e of invitation f
7、or bids or request for proposal shall apply. Unless otherwise AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D629 ASTM D1682 ASTM D1910 Test for Construction Characteristics of Method for quantitative Analysis of Textiles Methods of Test for Breaking Load and Elongation of Textile Fabrics Wo
8、ven Fabrics (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 3. REQUIREMENTS 3.1 Physical characteristics. 3.1.1 Weave construction. The material shall be an eight harness satin weave graphite fabric. The graphi
9、te yarn used in the fabric shall be in accordance with MIL-Y-87125, Type I, 3.1.2 Yarn count. Yarn count in the fabric shall be as follows: Direct ion Ends / Inch Warp 29 to 31 Fill . 29 to 31 3.1.3 Weight. yard. The fabric weight shall be 4 to 6 ounces per square 2 , Provided by IHSNot for ResaleNo
10、 reproduction or networking permitted without license from IHS-,-,-MIL -F -8 7 12 1A (U SAF) 3.1.4 Color. The fabric shall have a uniform color. 3.1.5 Fabric thickness. - + 0.002 inches. The thickness of the fabric shall be 0,012 3.2 Composition. 3.2.1 - Volatile content, not exceed 5.0 percent by w
11、eight. The volatile content of the fabric shall 3.2.2 Carbon content. The carbon content of the fabric shall be 99.6 percent by weight, minimum, after the volatiles are removed. 3.3 Pfechanical properties. 3.3.1 Breaking strength. The minimum breaking strength of the fabric shall be as follows: Mini
12、mum Breaking Strength Direction (Pounds per Inch Width) TcTarp 100 Fill 100 3.4 Identification and marking. Identification and marking shall be in accordance with MIL-STD-130. Each roll of fabric shall be identified using a label affixed to the inside of the winding tube. The label shall contain the
13、 following information: a. Vendor serial number and lot number b, Vendor trade name C. Specification number. 3.5 - Workmanship. product which is uniform in appearance and weave construction. 3.5.1 Defects. The fabric shall not have more then 2 holes and 2 torn selvages per 3 yards of fabric length.
14、A hole is defined as a preforation 0.125 inch or larger. The fabric shall be woven so as to yiqld a 3.5.2 Contamination. There shall be no dirt, metal particles, or other foreign matte; present in the fabric. 3.6 Preproduction. When specified, a preproduction sample roll of fabric at least 100 yards
15、 long shall be produced using the same methods proposed for the preparation of subsequent production lot. 3 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-F MIL-F-87 121A (USAF) 4. QUk,ITY ASSUTIANCF PROVISIONS 4.1 Responsibility for inspection. .
16、- Unless otherwise specified in the contract, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as other- wise specified in the contract, the contractor may use his own facilities or any other facilities suitable for the performance of the i
17、nspection requirements specified herein, unless disapproved by the Government, of the inspections set forth in the specification where such inspec- tions are deemed necessary to assure supplies and services conform to prescribed requirements. The Government reserves the right to perfom any 4.2 Class
18、ification of inspection. The inspections requirements specified herein are classified as follows: a. Preproduction tests (see 4.3). b. Quality conformance inspection (see 4.4). 4.3 Preproduction tests. The preproduction sample roll of fabric shall be subjected to the following tests: a. Defects and
19、contamination 4.5.2 b. Color 4.5.7 C. Identification and marking 4.5.10 . d. Workmanship 4.5.11 e. Preservation, packaging an+. packing 4.5.12 4.3.1 Ifter comr;letion of the above tests, randomlv select three (3) samples (approximately 3 yards long) from the sample roll and subject each sample to th
20、e following tests: a. Weave construction b. Volatile content C. Carbon content d. Yarn count e. Weight f. Fabric thickness g. Breaking strength 4.5.1 4.5.3 4.5.4 4.5.5 4.5.6 4.5.8 4.5.9 4.4 Quality conformance inspections. 4.4.1 Acceptance tests. Acceptance tests shall consist of the individual and
21、sampling tests of 4.4.1.1 and 4.4.1.2. 4 i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-8722LA 83 m 777770b 0441623 T m 4.4.1.1 - IndiYidual tests. to the follotring individual tests: Each roll of fabric shall be subjected a. Defects and con
22、tamination 4.5.2 b. Color 45.7 c. Identification and marking 4.5.10 d. Workmanship 4.5.11 e. Preservation, packaging and packing 4.5.12 4.4.1.2 Sampling tests. From the start of each sample roll, take a one (1) yard + 6 inch strip of fabric and subject it to the foi lowing tes tsY a. Weave construct
23、ion b. Volatile content c. Yarn count d. Weight e, Fabric thickness f, Breaking strength 4.5.1 4.5.3 4 05 05 4.5.6 4.5.8 4.5.9 4.4.1.3 Sampling plan. Sample rolls of fabric shall be randomly selected from each lot in accordance with the following schedule. Lot Size (rolls) Sample Size (rolls) 1-2 3
24、- 15 16 - 65 66 - 110 111 - 300 A.11 2 3 5 7 . 4.4.1.4 Rejection. When the fabric fails to meet any acceptance requirements, the lot shall be retested using double the number of samples. shall be rejected. If a failure occurs during the second retest, the lot 4.4.1.5 Test condition. Unless otherwise
25、 specified, the tests required by this specification shall be made at an atmospheric pressure of 30 5 2 inches of mercury, and at a temperature of 24.5 - + 2OC (76 - + 4OF) and a relative humidity of 50 2 10 percent. 4.4.1.6 Measurements. All measurements shall be made with instruments whose accurac
26、y has been verified in accordance with MIL-C-45662. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-8712lA (USAF) 4.5 Test methods. 4.5.1 Weave construction. Perform test in accordance with ASTM D1910. Verify compliance with 3.1.1. 4.5.2 Defe
27、cts and contamination. of fabric from each roll. Verify compliance with 3.5.1 and 3.5.2. Visually examine a minimum of 2 yards 4.5.3 Volatile content. Weigh approximately 1 gram of fabric into a tared (50 milliliters (mL) porcelain crucible, Heat 16 hours minimum in a muffle furnace at 400 f. 20OC (
28、204 f. 68OF). Cool in a desiccator and reweigh. Calculate the loss in weight. Verify compliance with 3.2.1. 4.5.4 Carbon content, Determine the carbon content by gas chromato- graphy using the test method of 4.6.1. Verify compliance with 3.2.2. 4.5.5 Yarn count, Perform the test in accordance with A
29、STM D1910. Verify compliance with 3.1.,2. 4.5.6 Weight. Perform test in accordance with ASTM D1910. Verify compliance with 3.1.3, 4.5.7 Color, each roll. 4.5.8 Fabric thickness. Measure the fabric thickness in accordance with FED-STD-191, Method 5030. Verify compliance with 3.1.5, Visually examine a
30、 minimum of 2 yards of fabric from Verify compliance with 3.1.4. 4.5.9 Breaking strength. Perform test in accordance with the ravelled strip test of ASTM D1682 using 5 specimens. 3.3.1. Verify compliance with 4.5.10 Identification and marking. Visually examine the fabric roll. Verify compliance with
31、 3.4. 4.5.11 Workmanship. Visually examine the fabric. Verify compliance with 3.5. 4.5.12 Preservation, packaging and packing. To verify compliance with Section 5, examinations shall be performed to ensure that all require- ments have been.met. 4,6 Test procedures. 4.6.1 Carbon content. 4.6.1.2 Samp
32、le preparation. Weigh approximately 1 gram of fabric into a tared 50 milliliter (mL) porcelain crucible, Heat 16 hours minimum 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-8 7 12 1A (USAI?) -in a muffle furnace at 400 5 2OoC (752 + 68OF).
33、Cool in a desiccator. Detemine the carbon content by gas chrmatography using an F if below 0.6000 mg., add sample. 4.6.1.7 Preparation of sample for combustion. a. b. C. d. e. f. Position one of the combustion rod assemblies on the rod holder and slide the retaining nuts to within 2 inches of the ro
34、d end. The small retaining nut must not be tightened into the large nut. Using tweezers, remove the weighed sample from the balance and place it in the boat cavity of the rod. Pack the boat with oxidizing catalysts until it is even with the top of the boat. Tap the catalyst down firmly with the spat
35、ula. NOTE: Samples that are difficult to burn should be mixed with a small amount of catalyst prior to filling boat. Remove the hot combustion rod from the furnace by unscrewing the large retainer nut and pulling the entire assembly outward. posit ion. Position the loaded rod in the “SAMPLE PORT“ an
36、d immediately secure in position by tightening the large retaining nut, Never use a wrench or pliers. Hand tighten the small retaining nut. the handle grip in a perfectly vertical position while tightening the nut, or the sample will fall out into the neck of the combustion tube. NOTE: When the hot
37、rod was removed, the carrier system was partially opened to atmosphere; and when the loaded rod was installed, the system was resealed. As a result, the atmosphere “slug“ that-was admitted in the interim will now be carried onto the chromatographic column by the restored carrier gas flow. The detect
38、or and recorder will show this chain of events. Place the hot rod in the cooling Use only hand pressure for this step. Be careful to keep 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i MIL-F-8712LA 3 m 7777906 04LiL628 7 m F MIL-F-87121A(USAF) g
39、. After the atmosphere peak is recorded and the baseline is returned to the approximate normal position, loosen the small retaining knob slightly while holding the rod handle to prevent it from turning. CYCLE“ pushbutton, then push the rod into the combustion tube as far as it will go. Depress the “
40、START TIME NOTES: Do not completely loosen the small nut to perform the above step, It is only necessary to loosen it to the point when the rod can be pushed in about 1/4 turn. The instrument will now combust the sample for 40 seconds. The gases will then be swept into the reduction furnace and chro
41、mato- graphic column. If automatic attenuation mode is used, the. instrument will automatically attenuate the recorded signal to keep all the peaks on scale. If the manual mode of attenuation is used., adjust attenuation for each peak as follows: Peak 1, Nitrorren x 8 Peak 2, Carbon Dioxide, x 32 Pe
42、ak 3, Water, x 8 4.6.1.8 Calibration. a. Set the weight dial to read 700 and set the “SENSITIVITY SELECTOR“ to liXANUAL“. Move the “ATTENUATION“ control to the “8“ position. Place an empty sample boat in the rod cavity . Fill the boat with catalyst and pack the catalyst lightly with a spatula. b, C.
43、 Load the catalyst-only rod into the instrument and run a d. . chromatogram. The resulting chromatogram will show how much C-H-N is contained in the catalysts. Under normal conditions, the first peak (N) will not exceed 1 scale division high; the second peak (C) will not exceed 4 scale divisions; an
44、d the third peak (H) will not exceed 5 divisions. If the peaks fall within the tolerances shown in Table I (at a manual x 8 attenuation), skip the next step and go to step f). 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-312LA 3 W 7777306
45、 OL1Li1629 O Normal Height (Scale Divisions) 1st peak (N). 1 2nd peak (C) 4 3rd peak (H) 5 MIL-F-8 7 12 LA (USAF ) Upper Limit (Scale Divisions) 1 8 10 e. f. g* h. If the peaks exceeded the upper limit shown in column 3 of Table I, recondition the catalysts according to the manufacturers instruction
46、s. If the blank peak heights are within tolerance, continue running blanks until the peaks are at a minimum level and are reproducible, NOTE: Contaminats used in the manufac- turing of the combustion rods will also be eliminated as the blanks are run. Record the peak height of the C, H, t N peaks to
47、 be used later in calibrating the instrument, Remember to divide the peak height by a factor of 4, as we will now switch back to automatic operating, and the C peak will be , attenuated (x 32). Move the “SENSITIVITY SELECTOR“ switch to the “AUTOMATIC“ position. If desired, however, analysis can be m
48、ade with this switch in the MANUAI position. must be attenuated by the operator. In this case, peaks 4.6.1.9 Standard sample. A standard sample whose carbon content most closely matches that of the unknown and therefore gives a CO2 peak similar in-height to that obtained on the unknown is used to ob
49、tain the correction contents. From the measured peak height values, the constants are computed as follows; using 2, 4-D as an example: 51.79% (Measured C Peak Height - (Measured-C Peak Height Carbon Kc = from sample run) from blank run) 4.6.1.10 unknown sample. The unknown sample is treated in exactly the same manner, and using the above calculated constraints of proportiona- lity, the contents are computed
