1、INCH-POUND I MIL-DTL-45301E 5 June 1998 SUPERSEDING 22 June 1987 MIL-T-45301D DETAIL SPECIFICATION TREAD ELASTOMER SOLID TIRE, FOR TRACK LAYING VEHICLES This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers
2、6 classes of unvulcanized tread elastomer used in the rebuilding of roadwheels and track support rollers for track laying vehicles. 1.2 Classification. Tread elastomer will be classified as follows: Class 1 - Piece (cut to length). Class 2 - Roll (cut to length). Class 3 - Sheet. Class 4 - Unmixed s
3、heets (two part batch). Class 5 - Strip form (for cold feed extruder and injection molding). Class 6 - Black master batch with separate unmixed chemicals (for mill mixing). Group A - Physical properties - Standard tensile. Group B - Physical properties - High tensile. Beneficial comments (recommenda
4、tions, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Tank-automotive and Armaments Command, ATTN: AMSTA-TR-EBLUE, Warren, MI 48397-5000, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing
5、 at the end of this document, or by letter. AMSC NIA FSC 2640 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-4530 1 E 2. APPLICABLE DOCUMENTS 2.1 General. The
6、documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited 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 thi
7、s list, document users are cautioned that they must meet all specified requirement dociments cited in section 3 and 4 of this specification, whether or not they are listed. 2.2 Non-Government mblications. The following documents form a part of this document to the extent specified herein. Unless oth
8、erwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of the documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SO
9、CIETY FOR TESTING AND MATERIALS (ASTM) ASTM D297 - ASTM D412 - ASTM D5 18 - ASTM D573 - ASTM D792 - ASTM D1149 .- ASTM D1415 - ASTM Dl46 - 1 ASTM D2137 L ASTM D2240 - ASTM D3 182 L ASTM D3 183 - Rubber Products - Chemical Analysis (DoD Adopted). Rubber Properties in Tension (DoD Adopted). Rubber Det
10、erioration - Surface Cracking (DoD Adopted). Rubber Deterioration in an Air Oven (DoD Adopted). Specific Gravity and Densiv of Plastics by Displacement (DoD Adopted). Rubber Deterioration - Surface Ozone Cracking in a Chamber (Flat Specimen) (DoD Adopted). Rubber Property, International Hardness OD
11、Adopted). Rubber - Viscosity and Vulcanization Characteristics (Mooney Viscometer) OD Adopted). Standard Test Method for Rubber Property - Brittleness Point of Flexible Polymers and Coating Fabrics OD Adopted). Rubber Property - Durometer Hardness OD Adopted). Rubber Materials, Equipment and Procedu
12、res for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets (DoD Adopted). Standard Practice for Rubber - Preparation of Pieces for Test Purposes fiom Products OD Adopted). * (Application for copies should be addressed to the American Society for Testing Materials, 100 Barr Harbor Dri
13、ve, West Conshohocken, PA 19428-2959.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45301E 2.3 Order of mecedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specif
14、ication takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.1.2. 3.2 Ma
15、terial. 3.2.1 Tread elastomer. The chemical compounding of tread elastomer shall be such that all classes and sizes of both groups are black in color. When Group B, P-12 material is furnished, the compound formulation is in accordance with table I (see 4.6.1). TABLE I. Compount Relative Materials SB
16、R 1500 Cis-4 1203 or CB 220 I/ Zinc oxide Stearic acid N220 carbon black Flexzone 7-L I/ Sunolite 100 I/ Agerite Resin D I/ Sundex 790 .l-/ Nobs special l/ Santogard PVI L/ Sulfur weight 70.00 30.00 3 .O0 2.00 62.00 3 .O0 1 SO 2.00 2.00 1.20 0.20 1.60 Formulation Group B, P 12 material. Chemical com
17、position Polymer Polymer (N- 1,3-Dimethybutyl-N-phenyl-p- (Blend of Waxy Hydrocarbons) (Polymerized 2,2,4-trimethyl- 1,2-dihydroquinoline) Oil N-oxydiethylene-2-benzothiazole-sulfenaide N-(cyclohexylthio) phthalimide phenylenediamine) (2-morpholinothio) benzothiazole Total Formula Weight - - 1 / Sub
18、stitution may be made with chemical equivalents from other mmufacturers. 3.2.2 Tie um. When specified (see 6.2), tie gum shall be elastomer. Tie gum shall not include any reclaimed rubber (see 4.6.2). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
19、-MIL-DTL-45301E 3.2.3 Backing. Backing shall be made in conformance to the physical properties in table I and may be either flat or embossed (see 4.6.2). 3.2.4 Vulcanization. The vulcanization time in the creation of specimens shall not exceed 90 minutes at a temperature of 280 degrees Fahrenheit (“
20、F) 137 degrees Celsius (“C). Processing instructions and recommended curing time and temperature shall be furnished for class 3,4,5, and 6 tread elastomer (see 4.6.3 and 6.2). 3.2.5 Recycled, recovered, or environmentally Preferable materials. Recycled, recovered, or environmentally preferable mater
21、ials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.3 Construction. 3.3.1 Class 1 and class 2. Unless otherwise specified (see 6.2), class 1 and class 2
22、 tread elastomer shall be supplied with a 0.003 inch (in.) 0.076 millimeter (mm) minimum layer of plastic sheet backing (see 3.2.3) on the tread surface with the greatest dimension. When tie gum is specified (see 6.2), the tread elastomer shall be an assembly consisting of a layer of tread compound
23、(see 3.2.1), a 0.031 in. (0.787 mm) minimum layer of tie gum on the tread surface with the greatest dimension (see 3.2.2), and a 0.003 in. (0.076 111111) minimum layer of a plastic sheet backing on the tie gum (see 3.2.3). The bonding of these materials shall be such that they will not separate duri
24、ng shipping, normal handling, and processing, including vulcanizing of the tread and tie gum, if applicable, to the wheels. The bond between the tie gum and tread elastomer must be not less than 5 pounds per inch 875.6 Newtons per meter (N/m) of width. Removal or separation of the plastic backing sh
25、all not result in separation of the tie gum recwirements. 3.5.1 Performance. 3.5.2 Physical properties. The physical properties of the tread elastomer and the tie gum shall be as specified in table III for all groups. Curing characteristics shall be as specified in table IV. Special physical propert
26、ies are specified for group B elastomer when furnished in the P-12 material (see 4.9.1.1). 3.5.3 Adhesion. The tread elastomer shall be such that, when vulcanized onto the wheel with the users approved bonding agent and processes, the adhesion of the tire shall be complete. There shall be no areas o
27、f deficient adhesion. The load required to separate the tread from a base band or wheel, per in. of width on any line of separation around the circumference, shall be not less than the following when the different materials are used (see 4.9.1.2): Group A Group B Group B, P-12 material - 100 pounds
28、(lb) 45 kilograms (kg) - 130 lb (59 kg), 150 lb (68 kg) average - 130 lb (59 kg) 3.5.4 Resistance to blowout. When assembled, the roadwheel (tire) shall withstand 6 hours continuous running at 30 miles per hour (mph) 48 kilometers per hour (km/h) on a rotating steel wheel drum without evidence of cr
29、acking, chunking, blowout, separation, 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45301 E Properties Hardness (Durometer, Shore A, or IRHD) Before aging blistering, contamination, porosity, delamination or lack of adhesion. Any undercu
30、tting shall be not in excess of 0.25 in. (6.35 mm) deep (see 4.9.1.3 and 6.6). Tie gum and tread elastomer requirements, all classes Group B, Group A Group B P- 12 material 73 5 7257 73 f. 5 , Low temperature flexibility I After accelerated aging Tensile strength min. psi (kpa) Tensile strength chan
31、ge (percent) Elongation change (percent) Tensile strength min. pounds per square inch (psi) kiloPascals (kpa) Ultimate Elongation, percent Modulus, 200 percent min. psi (kpa) Modulus, 300 percent min. psi (Pa) Modulus, 400 percent min. psi (Pa) Ozone resistance 1 Specific gravity -40C (-40F) -40C (-
32、40F) -4OOC (-40F) - - 2500 (17 240) - + 25 + 25 - - + 35 - I35 2100 (14 480) Mooney units 4 minute reading, max. Mooney units Minutes to 5 point rise, maximbm Initial reading, max. Mooney units Minutes to 5 point rise, minimm 200 minimum 1600 (11 030) Tread elastomer and tie gum Before aging After a
33、ging 7 days 158F (70C) 60 1 O0 40 60 65 65 35 19 - 1.190 max. 7 day duration 3000 (20 685) - 2000 (13 790) 1.200 max. 7 day duration 2700 (18 620) 350 minimum 2000 (13 790) 1.170 ma. 7 day duration - - 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
34、,-MIL-DTL-4530 1 E tread elastomer cut fiom overhanging edges and plied together to prepare Mooney test specimens 0.25 in. (6.4 mm) in thickness and 1.75 in. (44.5 mm) in diameter. 3.5.5 Resistance to seDaration. When assembled, the roadwheel (tire) shall withstand 48 hours continuous running at 1 O
35、 mph (1 6 km/h) on a rotating steel wheel drum without evidence of cracking, chunking, blowout, separation, blistering, contamination, porosity, delamination or lack of adhesion. Any undercutting shall be not in excess of 0.25 in. (6.35 mm) deep (see 4.9.1.4 and 6.6). 3.6 Ownership and support reaui
36、rements. 3.6.1 Storage life. 3.6.1.1 Classes 1,2,3 and 5. Tread elastomer shall be capable of being stored for a minimum period of 6 months after date of manufacture without any evidence of pre-curing, provided storage has complied with all the following conditions (see 4.1 O. 1.1): a. b. C. The mat
37、erials have been protected fiom physical damage during the storage period. The ambient air temperature during storage has been within the range of 40F (4C) to 90F (32C). The average ambient air temperature during storage has not exceeded 70F (21 OC). 3.6.1 -2 Classes 4 and 6. Tread elastomer shall s
38、how no pre-curing for two years after the date of manufacture when the unmixed sheets or materials are stored in separate containers, , protected by suitable material applied by the manufacturer and under normal inside storage conditions (see 4.10.1.2). 3.6.2 WorkmanshiD. Workmanship shall be such a
39、s to produce tread elastomer which will be fiee of foreign materials, cracks, blisters, or folds. Mixing of compound formulation shall be complete and of the best commercial practice to adequately disperse all ingredients of the formula (see 4.10.2). 3.7 Operating environment requirements. 3.7.1 Moo
40、nev viscometer samples for accelerated aging for classes 1,2,3 and 5 tread elastomer. The unvulcanized tread elastomer shall meet the after aging Mooney requirements specified in table IV (see 4.1 1 .i). 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
41、,-,-MIL-DTL-4530LE = 9999906 2066486 591 = MIL-DTL-45301 E 3.7.2 Accelerated aging for classes 4 and 6 tread elastomer. Separate samples of unmixed classes 4 and 6 tread elastomer shall be oven aged. The samples shall then be mixed and shall meet the after aging Mooney requirements specified in tabl
42、e IV (see 4.1 1.2). 3.7.3 Ozone resistance. The elastomer materials used in the solid tires shall be resistant to ozone exposure (see 4.1 1.3). 3.7.4 Low temerature flexibility. The elastomer shall withstand a low temperature range of -40F (-40C) (see 4.1 1.4). 4. VERIFICATION 4.1 Classification of
43、inmeetion. The inspection requirements specified herein are classified as followed: a. First article inspection (see 4.1.2). b. Conformance inspections (see 4.1.4). 4.1.1 Inmection conditions. Unless otherwise specified herein (see 6.2), all inspections shall be performed in accordance with the test
44、 conditions specified below: a. Air temperature 73 5 18F (23 1 0C) b. Relative humidity 50 2 30 percent c. Barometric pressure 28.5 (+2.0, -4.5) in. of mercury (Hg) 96 (+7, -1 5) kilopascals (a) 4.1.2 First article inspection. Unless otherwise specified (see 6.2), first article inspection shall be p
45、erformed on the quantities of tread elastomers listed below, when a first article sample is required (see 3.1). Unless otherwise specified (see 6.2), these tests (denoted by an asterisk (*) in table V shall be conducted by the Government at a place designated by the Government. The contractor may, u
46、pon request, witness the tests conducted by the Government. a. Class 1 : 1 O preformed pieces. b. Class 2: 3 rolls. c. Classes 3,4,5, and 6: 360 lb (164 kg). d. All classes: Five (5) platen press sheets (see 4.5). If several die sizes of class 1 and class 2 tread elastomer are ordered, unless otherw
47、ise specified (see 6.2), die size for tire size 26 x 6 and die size for tire size 26 x 2 1/8 shall be furnished. This inspection shall include the examinations of 4.1.3.4 and the tests of table V. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
48、L-DTL-45301 E TABLE Title First article Tread elastomer Tie gum Backing Vulcanization Construction Classes Classes 1,2,3 Accelerated aging, classes 1,2,3 s. l/ Load - Ibhn (N/m) of nominal tire width at 30 mph (48 km/h) 120 (21 015) 140 (24515) 155 (27 145) 175 (30 645) 195 (34 150) 195 (34 150) 205
49、 (35900) 340 (59540) 365 (63 920) 385 (67420) 410 (71 800) 435 (76 175) 455 (79680) 480 (84055) 505 (88435) 530 (92 815) 555 (97 190) 580 (101 570) 605 (105 945) 4.9.1.4 Seuaration (drum) test. 4.9.1.4.1 Amaratus. To determine conformance to 3.5.5, the testing apparatus shall be the same as that specified in 4.9.1.3.1. . 4.9.1.4.2 Procedure. The tire, mounted o
