1、 METRIC MIL-PRF-24176C 14 October 2004 SUPERSEDING DOD-PRF-24176B (SH) 31 August 1979 PERFORMANCE SPECIFICATION CEMENT, EPOXY, METAL REPAIR AND HULL SMOOTHING (METRIC) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specif
2、ication covers a two-component epoxy cement for use in filling rough or pitted metal surfaces. 1.2 Classification. Epoxy cements covered by this specification are to be furnished ready-to-use for the following types, as specified (see 6.2): Type I - Alkali resistant. Type II - Non-alkali resistant.
3、2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 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
4、 been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards and handbooks. Th
5、e following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. Comments, suggestions, or questions on this document should be addressed to Com
6、mander, Naval Sea Systems Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to commandstandardsnavsea.navy.mil, with the subject line “Document Comment“. Since contact information can change, you may want to verify the currency of this addre
7、ss information using the ASSIST Online database at www.dodssp.daps.mil AMSC N/A FSC 8030 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24176C 2 DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-24441 - Paint, Epoxy-Polyamide, General Specificati
8、on for. MIL-PRF-24647 - Paint System, Anticorrosive and Antifouling, Ship Hull. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch or www.dodssp.daps.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-509
9、4.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contrac
10、t. BUREAU OF MEDICINE AND SURGERY (BUMED) BUMED INST 6270.8 - Procedures for Obtaining Health Hazard Assessments Pertaining to Operational Use of a Hazardous Material. (Copies of this document are available online at https:/bumed.med.navy.mil or from Bureau of Medicine and Surgery, Department of the
11、 Navy, 2300 E Street, NW, Washington, DC 20372-5300.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR
12、QUALITY (ASQ) ASQC Z1.4 - Sampling Procedures and Tables for Inspection by Attributes. (DoD adopted) (Copies of this document are available from www.asq.org or American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNATIONAL A 109 - Standard Specification for Steel
13、, Strip, Carbon (0.25 Maximum Percent), Cold-Rolled. (DoD adopted) B 209 - Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate. (DoD adopted) B 584 - Standard Specification for Copper Alloy Sand Castings for General Applications. (DoD adopted) C 531 - Standard Test Method for Line
14、ar Shrinkage and Coefficient of Thermal Expansion of Chemical-Resistant Mortars, Grouts, Monolithic Surfaces and Polymer Concretes. (DoD adopted) D 695 - Standard Test Method for Compressive Strength of Carbon and Graphite. (DoD adopted) D 2240 - Standard Test Method for Rubber Property - Durometer
15、Hardness. (DoD adopted) (Copies of these documents are available from www.astm.org or ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24176C 3 2.4 Order of preceden
16、ce. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification
17、. The cement furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.1 and 6.4). 3.1.1 Requalification in case of reformulation. Any changes in the formulation of the produc
18、t submitted for qualification testing shall be cause for requalification of the product (see 4.2). 3.2 Cement. The cement shall be a two-component (component A-resin and component B-curing agent), chemically reactive, epoxy cement, with suitable additives to produce a material in conformance with th
19、e requirements specified herein. The use of any ozone depleting substance (ODS) in the composition of the cement under this specification directly or referenced in any test method is hereto prohibited. Environmentally safe and non-ODS alternative solvents may be substituted for any previously specif
20、ied ODS such as trichoroethylene (see 6.2). The use of asbestos or asbestos containing ingredients in the cement is prohibited. 3.3 Manufacture. Ingredients for each component shall be processed and mixed to produce a product which is uniform, free from dirt and grit, and in full conformance with th
21、e requirements of this specification. 3.4 Quantitative requirements. The cement shall conform to the quantitative requirements shown in Table I, and as herein specified. TABLE I. Quantitative requirements. Requirements Characteristic Minimum Maximum Hardness of cured epoxy cement, Type D units 55 -
22、Pot life, minutes 21C 1C (70F 2F) 15 180 32C 1C (90F 2F) 10 120 Curing time, hours - 24 Compressive strength, pascal (lb/in2) 3.9 x 107 (5500) - Shrinkage, percent - 0.25 3.5 Qualitative requirements. The cement shall conform to the qualitative requirements specified herein. 3.5.1 Consistency. The t
23、wo components of the cement shall be of smooth, uniform consistency and sufficiently viscous to allow ready mixing at temperatures between 21C and 32C (70F and 90F). 3.5.2 Color. The two components of the cement shall be of dissimilar colors and the finished cement shall be a distinctive color diffe
24、rent from either component when tested as specified in 4.5.3. 3.5.3 Application characteristics. The cement shall be trowelable and shall produce a smooth surface when tested as specified in 4.5.5. 3.5.4 Resistance to vertical sagging. The cement shall not sag when tested as specified in 4.5.6. Prov
25、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24176C 4 3.5.5 Adhesion and resistance to impact. The cement shall remain firmly adhered to the steel, aluminum, and copper alloy plates when tested after 7-day and 3-month curing periods as specifi
26、ed in 4.5.8. 3.5.6 Compatibility of cement with primers and paint. There shall be no signs of lifting, peeling, softening, blistering, poor intercoat adhesion, or other undesirable properties when tested as specified in 4.5.9. 3.5.7 Alkali resistance (Type I only). The cement shall show no evidence
27、of evolution of gas, loss of adhesion, swelling, softening, marked color change, or other indications of deterioration when tested as specified in 4.5.10. 3.5.8 Storage stability. When stored for 1 year as specified in 4.5.13, the cement shall meet the requirements of 3.4, except that hardness, curi
28、ng time, and pot life shall vary not more than plus or minus 10 percent of the values specified in Table I. 3.6 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the m
29、aterial meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.7 Toxicity. When evaluated in accordance with 4.6, the cement shall have no adverse effect on the health of personnel when used for its intended purpose and shall not cau
30、se any environmental problems during waste disposal (see 4.6 and 6.6). 3.8 Asbestos prohibition. Epoxy metal repair and hull smoothing cement provided in accordance with this specification shall contain no asbestos nor any asbestos-containing ingredients. 4. VERIFICATION 4.1 Classification of inspec
31、tions. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2). b. Conformance inspection (see 4.3). 4.2 Qualification inspection. Qualification tests shall be conducted at a laboratory satisfactory to the Naval Sea Systems Command. Qualification
32、 tests shall consist of the tests specified in 4.4 and 4.5. 4.3 Conformance inspection. 4.3.1 Sampling. 4.3.1.1 Lot. For purposes of sampling, a lot shall consist of all cement from one production batch offered for delivery at one time. 4.3.1.2 Sampling for tests. From each lot offered for inspectio
33、n, a total of 8 liters (two gallons) of the appropriate volume ratio of each component of the cement shall be selected at random and forwarded to an acceptable laboratory for testing as specified in 4.4 and 4.5. 4.3.1.3 Sampling for examination of containers. A random sample of filled containers sha
34、ll be selected by the inspector in accordance with ASQC Z1.4 at inspection level I to verify compliance with all requirements of this specification regarding fill, closure, marking, and other requirements not involving tests. Any unacceptable containers shall be discarded and be replaced by containe
35、rs that pass the requirements. 4.3.1.3.1 Examination of containers. Each filled container selected as a sample shall be examined for defects of construction of the container and the closure, for evidence of leakage, and for unsatisfactory markings. Provided by IHSNot for ResaleNo reproduction or net
36、working permitted without license from IHS-,-,-MIL-PRF-24176C 5 Any container in the sample having defects or under required fill shall be rejected, and if any defective containers in any sample are not replaced for the appropriate sampling plan of ASQC Z1.4, the lot represented by the sample shall
37、be rejected. 4.3.1.4 Lot acceptance. The inspection test samples selected in accordance with 4.3.1.2 shall be subjected to the applicable tests specified in 4.4 and 4.5 except for the adhesion test after the 3-month curing period and for the storage stability test (see 3.5.5 and 3.5.8). The contract
38、or shall not release a lot until a favorable report is received from the laboratory. Nonconformance of a sample shall be basis for rejection of the lot represented by the sample. 4.4 Conformance tests. Conformance tests for each lot shall consist of all the tests specified in 4.5, except for the adh
39、esion test after the 3-month curing period and for the storage stability test (see 3.5.5 and 3.5.8). 4.4.1 Rejection. If any sample is found not to be in conformance to the requirements of this specification, this shall be cause for the rejection of the lot represented by the sample. 4.5 Test method
40、s. 4.5.1 Test conditions. Unless otherwise specified, test conditions shall be temperature 25 1C (70F 2F) and relative humidity 30 - 80%, using a pre-test conditioning period of 48 hours. The conditioned components of the cement shall be mixed in the proportions recommended by the manufacturer and i
41、n a manor to produce a uniform color (see 3.5.2). 4.5.2 Hardness. The hardness test shall be performed in accordance with ASTM D 2240, Type D. Hardness readings shall be determined upon the cemented channel test specimen utilized in 4.5.7. Five random readings shall be made following a 72-hour curin
42、g period of the cemented channel. The average of the five readings shall be reported. 4.5.3 Color. Visual examination of the components shall show sufficient contrast in colors so as to produce a new uniform color after combining the two components in the specified proportions and mixing. 4.5.4 Pot
43、life. The pot life of the cement shall be determined at temperatures of 21 1C to 32 1C (70 2F to 90 2F). The components of the cement prior to mixing shall be conditioned for a period of 4 hours at each specified temperature. The consistency of the components and the mixed cement shall be smooth, un
44、iform, free of lumps and readily mixable by hand. A sufficient amount of cement shall be prepared and immediately introduced into a flat bottom cylindrical metal container approximately 55 millimeters (mm) (2-3/16 inches) in diameter and 35 mm (1-3/8 inches) in depth (e.g., tin ointment box). The ti
45、me at which the container is completely filled with cement shall be noted as the starting time. A clean wooden tongue depressor shall be used periodically to probe the surface of the cement to a depth of approximately 3 mm (1/8 inch). The tongue depressor shall be held in a vertical position when pr
46、obing. The duration of time from the starting time until the cement no longer adheres to the clean end of a probe shall be recorded as the pot life. 4.5.5 Application characteristics. A steel channel approximately 125 mm (5 inches) long by 75 mm (3 inches) wide by 6 mm (1/4 inch) deep shall be const
47、ructed. All metal plate surfaces to be utilized for test purposes shall be cleaned and finished with a No. 60 aluminum oxide cloth. The channel, while in a horizontal position, shall be completely filled with freshly-prepared cement and the excess cement removed by drawing a straight edge across the
48、 top edges of the channel. Dragging or clinging of the cement to the straight edge resulting in incomplete fill of the channel or production of a rough cement surface shall be cause for rejection. 4.5.6 Resistance to vertical sagging. Upon completion of the test specified in 4.5.5, the mixed but unc
49、ured cemented test specimen shall be used to determine the resistance of the cement to vertical sagging. Any excess cement that may extend beyond the open ends of the channel shall be removed with the straight edge and the channel positioned so that its long dimension is in a vertical position. Any sagging of the cement below the lower Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
