1、MIL-I-85Li7Lb W 7797706 0323597 3 W MIL-1-85491 (AS) 6 October 1981 MILITARY SPECIFICATION y-24-0c INSULATION MATERIAL, POLYISOPRENE This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Depart
2、ment of Defense. 1. SCOPE. 1.1 Scope. This specification establishes the requirements for three types of non-asbestos-containing polyisoprene insu1 ation material in the uncured calendered state (see 6.3.1). 1.2 Classification (see 6.2.1). Insulation covered by this specifica- tion shall be classifi
3、ed as follows: Type I: 0.030-inch thick material Type II: 0.050-inch thick material Type III: 0.100-inch thick material 2. APPLICABLE DOCUMENTS. 2.1 Issues of documents. The following documents of the issue in effect on date of invitation for bids or request for proposal form a part of this specific
4、ation to the extent specified herein. SPECIFICATIONS ? FEDERAL L-P-378 STANDARDS FEDERAL Fed Test Method Std No. 601 Plastic Sheet and Strip, Thin Gage, Polyol ef i n . Rubber: Sampling and Testing. - MILITARY MI L-STD-129 . Marking for Shipment and Storage. Beneficial comments (recommendations, add
5、itions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Comnanding Officer, Naval Air Engineering Center, Engineering Specifications and Standards Department (ESSD) , Code 93, Lakehurst; NJ 08733, by using the self-addressed Standardization Do
6、cument Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. IFSC 6810 1 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85q71 68 9977906 0123598 3 MIL-1-85491 (AS) 1 (Copies of specifications, standards, drawi
7、ngs, and pub1 ications required by suppliers in connection with specified procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publications. The following document forms a part of this specification to the extent specified herein.
8、 Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. STANDARDS American Society for Testing and Materials (ASTM) ASTM D 412 Standard Methods of Tension Testing of Rubber (Application for copies should be addressed to the American Societ
9、y for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 3. REQUIREMENTS. 3.1 Character or quality. The material shall be an uncured, non- as bestos-f i 1 1 ed , pol yi soprene material . 3.2 Product characteristics. 3.2.1 Dimensions and tolerances. Thickness tolerances for each type
10、Thickness tolerances within 1.50 inches of each edge of the of uncured, calendered sheet shall be within +lo percent of the specified thickness. roll and within 2 yards of each end of the roll shall not apply. The first and last 2 yards and 1.50 inch edges of each roll shall not be used in motor man
11、ufacture unless it complies with the thickness require- ment. Width tolerances for each type of uncured, calendared sheet shall be within 52 percent of the specified width. 3.2.2 Release agent. The insulation material, during processing and packaging, shall be kept free from any type of release agen
12、t, except that a commercially available, color contrasted polyethylene film con- forming to L-P-378, Type I, Class 1, Grade C, Finish 1, (0.003 inch thick) with a smooth surface (not embossed) shall be used to separate layers in the roll of the calendered insulation material, 3.2.3 Defects. The cumu
13、lative area of unvulcanited calendered insulation material in any roll containing defects such as wrinkles, voids, delaminations, and nonhomogeneous material , shall be not more than 10 percent of the area of the material in the roll. NOTE: The area within 1.50 inches of each edge of the roll and wi
14、thin 2 yards of each end of the roll shall be excluded. 2 -=. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85491 68 m 9999906 0123599 S Property Min MIL-1-85491 (AS) Max When determining percentage of defective area in the roll, any defects
15、within 24 inches of each other, measured parallel to the edge of the roll, shall be considered as one continuous defect. Defective areas shall not be used in motor manufacture. Volatile content, percent Ash content, percent TABLE I. Chemical properties of unvulcanized material. 3.3 24.2 26.8 - Flow
16、index, inches (a 4,000 pounds per square inch (psi) (a 2,500 psi 3.2 2.2 I I I I 3.3.2 Mechanical properties. When vulcanized in accordance with 4.2.1 and tested at 25 13 degrees Celsius (OC), the insulation material shall conform to Table II. 3.4 Stability. When stored in accordance with Section 5,
17、 the i-nsulaton material shall have a shelf life of not less than 6 months from date of calendering. The shelf life may be extended for 6-month intervals after reacceptance testing for conformance to the flow index requirements of Table I. Unless otherwise specified in the contract or purchase order
18、, no insulation material will be accepted by the procuring activity with less than 5 months shelf life remaining. 3.5 Workmanship. The insulation material shall be uniform, clean, of consistent high quality, and free from defects to the extent specified in 3.2.3. Provided by IHSNot for ResaleNo repr
19、oduction or networking permitted without license from IHS-,-,-MIL-1-85491 (AS) TABLE II. Mechanical properties of vulcanized material. Specific gravity, 25/4“C Hardness, Shore A Tensile strength, with grain (see 6.3.2), psi Tensile strength, across grain (see 6.3.3), psi Tensile strength ratio (see
20、6.3.4) Ultimate elongation, across grain, percent 4. QUALITY ASSURANCE PROVISIbNS. Min 1.14 69 1,000 820 0.8 250 Max I I 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order (see 6.2.1), the contractor is responsible for the performance of all ,inspection r
21、equirements as specified herein. Except as otherwise specified in the contract or purchase order, 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 rig
22、ht to perform any of the inspections set forth in this specification where such inspections are deemed necessary to assure that supplies and services conform to prescribed requirements. 4.2 Sampling. Selection of samples shall be in accordance with random sampling methods as specified in the Samplin
23、g and Acceptance Procedures section of Fed Test Method Std No. 601. Samples shall be taken from each lot of material, packaged, and identified as follows: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85491 (AS) a. Beginning not less than 2 y
24、ards from the end of roll, remove sufficient material for tests on samples as specified in 4.4. Indicate direction of the grain on the sample. b. Wrap the samples in a clean waterproof wrapper that will provide protection from moisture and light. c. Prepare an identification label with the following
25、 information and attach it to the wrapper: 1. Number and revision letter of this specification. 2. Material name or identification designation. 3. Lot number. 4. Date and time sample taken. 5. Identity of sample taken. 4.2.1 Vulcanized samples. For tests requiring vulcanized specimens, the samples s
26、hall be vulcanized at a pressure of 100 k10 pound-force per square inch gage for 2.0 to 2.5 hours at 107 k3“C. these conditions shall require prior approval of the procuring activity. Any deviation from 4.3 Quality conformance inspections. Quality conformance tests and inspections shall consist of t
27、he followins for each lot of insulation material (see 6.3.5): I a. Tests of Table I and Table II properties (see 4.4). b. Visual inspection (see 4.5.2). c. Packaging (see S-ection 5). 4.3.1 Acceptance criteria. Failure of any sample to pass all the requirements specified herein shall cause rejection
28、 of the lot represented. 4.4 Test methods. Tests shall be performed using apparatus, reagents, and procedures.specified herein. or procedures shall require prior written approval of the procuring activity. The use of alternate apparatus, reagents, 4.4.1 Volatile content. grams (gm) to the nearest 0.
29、001 gm, oven at 107 +3“C with absolute pressure not greater than 75 millimeters of mercury. The specimens shall remain in the oven for not less than 4 hours. Remove, reweigh, and calculate the volatile content. Weigh duplicate Specimens of from 10 to 15 Place the specimens in a vacuum 5 /- Provided
30、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85491 68 7777906 0123602 1 M MIL-1-85491 (AS) Cal cul at i on : B - A) x 100 B Percent volati1.e = 1 Where: A = weight of specimen after heating, gm B = weight of specimen prior to heating, gm Report the a
31、verage of the duplicate specimens to the nearest 0.1 percent. 4.4.2 Ash content. the nearest 0.001 gm. 528C for not less than 60 minutes. ash content. Weigh duplicate specimens of from 6 to 8 gm to Place the specimens in a muffle furnance at 815 Remove, reweigh and calculate the Cal cul ation: Ax 10
32、0 Percent ash = Where: A = weight of specimen after heating, gm B = weight of specimen prior to heating, gm .Report the average of the duplicate specimens to the nearest 0.1 percent. . 4.4.3 Flow index. 4.4.3.1 Apparatus. Garlock Flow Index Machine, or equal, with a 0.25-inch diameter orifice sprue.
33、 4.4.3.2 Flow index measurements. Prepare duplicate specimens of the calendered insulation material to a diameter of approximately 1.12 inches and a thickness of approximately 0.50 inch. be tested at 4,O.OO psi and one tested at 2,500 psi. Place the specimen in the pressure chamber of the flow index
34、 machine and test at applicable pressure for 3 minutes +15 seconds at 149 +6“C. of the tested specimen shall be measured to the nearest 0.05 inch. The test shall be repeated if the four readings on a single specimen do not agree within 10 percent. Report the average value of the four readings on eac
35、h specimen to the nearest 0.05 inch. One specimen shall Each of the four legs 4.4.4 Specific gravity. Specific gravity shall be determined in accordance with Fed Test Method Std No. 601, Method 14011. specific gravity at 25/4“C shall be reported to the nearest 0.01. The average Provided by IHSNot fo
36、r ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85491 68 7779906 0123603 3 = MIL-1-85491 (AS) 4.4.5 Hardness. Hardness shall be determined in accordance with Fed Test Method Std No. 601, Method 3021. 4.4.6 Tensile strength. Tensile strength.shal1 be determined in a
37、ccordance with Fed Test Method Std No. 601 , Method 4111, die Type III , with the exception that the average of values obtained shall be reported to the nearest 10 psi, and that two types of specimens shall be prepared from the calendered samples. grain direction is oriented in the length direction
38、of the specimen for with-grain testing. The other type shall be such that the material grain direction is oriented in the width direction of the specimen for across -grain testing. One type shall be such that the material 4.4.7 Ultimate elongation. Using the same specimen that was used in determinin
39、g across grain tensile strength (see 4.4.6) , ultimate elon- gation shall be determined in accordance with.ASTM D 412, Method A, Die C, except that the test temperature shall be 25 13“c, and the average shall be reported to the nearest 10 percent, The elongation shall be measured by an electrical ex
40、tensometer with provisions for indicating 10 percent strain increments on the load versus crosshead displacement chart. 4.5 Examinations. 4.5.1 Dimensional inspection. The dimensions of the unvulcanized calendered insulation material shall be determined at a material tem- perature of 25 +3“C. The th
41、ickness shall be determined by a micrometer or comparator graduated to 0.001 inch having an anvil or pressure foot of 0.375-inch diameter and exerting a total force of 3.0 k1.0 ounces. 4.5.2 Visual inspection. Visual inspection shall be made to dete-r- mine conformance to the requirements of 3.2.3,
42、3.5, and the packaging and marking requirements herein. 4.6 Records. Certification and test data shall be prepared as required by the procuring activity (see 6.2.2). 5. PACKAGING. 5.1 Preservation-packaging. 5.1.1 Level C (see 6.3.7). The insulation material shall berolled on a spool with a separato
43、r as specified in 3.2.2. The inside diameter of the roll shall be not less than 3 .inches. The roll shall be packaged so that it does not become contaminated during shipping and handling. While in the shipping container, the roll shall be supported at each end of t.he spool to prevent the roll from
44、becoming distorted. The maximum weight of the roll (including separator and spool) shall be 200 pounds. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85491 (AS) 5.2 Packing. 5.2.1 Level C. Insulation material , packaged in accordance with 5.1
45、.1 and damage. Packing shall be in accordance with comercial practice to ensure carrier acceptance and safe transportation. t shall be packed in a closed container to prevent contamination 5.3 Marking. 5.3.1 Roll marking. Unless otherwise specified herein, each roll shallhave a tag attached to it sh
46、owing the suppliers lot number, roll number, and date of cure-agent addition. 5.3.2 Container marking. In addition to any special marking required by the contract or purchase order (see 6.2.1), unit packages and shipping containers shall be marked in accordance with the requirements of MIL- STD-129.
47、 Container marking shall include the following: a. The suppliers lot number and roll number. b. Procuring activity purchase order number. c. Date of packing, date of cure-agent addition and date of cal endering. d. Precautionary marking as follows: CAUTION SHIP AND STORE AT TEMPERATURES BELOW 16C (6
48、0“ Fahrenheit) 5.4 Storage and shipment. The insulation material shall be protected from contamination and direct sunlight at all times. ment of the insulation material shall be at a temperature below 16C. The material shall be sealed in water, vapor-resistant containers. Caution shall be exercised
49、to prevent contamination to unpackaged (not enclosed in waterproof 1 iner) insulation material upon removal from storage temperature below 4C. Storage and ship- 6. NOTES AND CONCLUDING MATERIAL. 6.1 Intended use. The insulation material described herein is intended to be used as insulation in rocket motor cases. 6.2 Ordering data. 6.2.1 Procurement requirements. Procurement documents should specify the following: 8 Provided by I
