1、 PERFORMANCE SPECIFICATION COATINGS, SPRAYABLE, STRIPPABLE, PROTECTIVE, WATER EMULSION This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establishes the performance requirements for water emulsion, protective,
2、strippable, sprayable, coatings for application over metallic, painted, and plastic surfaces. 1.2 Classification. The coatings are furnished as the following type and classes as specified (see 6.2). 1.2.1 Type. The type of coating is as follows: Type II - Multi-coat system - Exterior (see 3.2.1) 1.2
3、.2 Classes. The classes of coatings are as follows: Class 1 - Basecoat (black) Class 1A - Basecoat (black) non-chromate Class 5 - Topcoat (white or olive drab) Class 6 - Topcoat (white) Class 6A- Topcoat (white) non-methanol Class 7 - Topcoat, brushable (see 3.2.1.2) AMSC N/A FSC 8030 INCH-POUND MIL
4、-PRF-6799L 03 September 2010 SUPERSEDING MIL- PRF-6799K 14 September 1998 Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Air Warfare Center Aircraft Division, Code 4L8000B120-3, Highway 547, Lakehurst, NJ 08733-5100 or emailed to michael.sikoranavy.mil.
5、 Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-6799L 2 2. APPLICABLE DOCUM
6、ENTS 2.1 General. The 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 t
7、he completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and stand
8、ards 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. FEDERAL SPECIFICATIONS P-P-560 - Polish, Plastic. TT-N-95 - Naphtha, Aliphatic. FEDERAL STANDARD FED-STD-595 - Color number 364
9、40 Gray, Flat or Lusterless. FED-STD-595 - Color number 24084 Green, Semigloss. COMMERCIAL ITEM DESCRIPTION A-A-857 - Thinner, Dope and Lacquer (Cellulose Nitrate). DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-5425 - Plastic Sheet, Acrylic, Heat Resistant. MIL-C-8514 - Coating Compound, Metal Pretre
10、atment, Resin-acid. MIL-PRF-22750 - Coating, Epoxy, High-Solids. MIL-PRF-23377 - Primer Coatings, Epoxy, High Solids. MIL-PRF-81352 - Coating, Aircraft Touch-up. MIL-T-81772 - Thinner, Aircraft Coating. MIL-PRF-85285 - Coatings, Polyurethane, Aircraft and Support Equipment. (Copies of these document
11、s are available online at https:/assist.daps.dla.mil/quicksearch/ or https:/assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
12、S-,-,-MIL-PRF-6799L 3 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 solici
13、tation or contract. CODE OF FEDERAL REGULATIONS DEPARTMENT OF TRANSPORTATION Title 49-Transportation, Parts 100-199 (Copies of these documents are available online at http:/www.gpoaccess.gov/cfr/index.html or from the Superintendent of Documents, US Government Printing Office, Washington, DC 20402.)
14、 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 QUALITY (ASQ) ASQ-Z1.4 - Sampling Procedures and Tabl
15、es for Inspection by Attributes. (DoD adopted) (Copies of this document are available from www.asq.org or the American Society for Quality, 600 Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNATIONAL ASTM-D2369 - Coatings, Volatile Content of. (DoD adopted) (Copies of these documents are availab
16、le from www.astm.org or ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) SAE INTERNATIONAL SAE-AMS-QQ-A-250/5 - Aluminum Alloy, Alclad 2024, Plate and Sheet (DoD Adopted) (Copies of these documents are available from www.sae.org or SAE International, 400 Commonwealth Dri
17、ve, Warrendale, PA 15096-0001.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-6799L 4 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references
18、 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. The coatings furnished under this specification shall be products that are author
19、ized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3). 3.2 Materials. The coatings shall be made from materials that ensure compliance to the requirements of this specification. 3.2.1 Form. 3.2.1.1 System coatings. Coatings shal
20、l be water emulsions which are capable of being sprayed and stripped as a system. Coatings shall be either: a. A type II two-part coating system consisting of a black pigmented class 1 basecoat and a compatible white or olive drab pigmented class 5 topcoat, or b. A type II two-part coating system co
21、nsisting of a black pigmented class 1 basecoat and a compatible white pigmented class 6 topcoat. 3.2.1.2 Repair coatings. Repair or patching to either of the systems above shall be accomplished using type II, class 7 brushable topcoat only. 3.2.2 Toxicity. The coatings shall have no adverse effect o
22、n the health of personnel when used for its intended purpose (see 6.3.2.1 and 6.3.2.2). 3.3 Performance. 3.3.1 Properties. The physical, mechanical, and chemical properties of the individual components and the coating systems shall be in accordance with the requirements and related tests as specifie
23、d in tables I and II. 3.3.2 Apparent viscosity. The limits of the apparent viscosity of type II, classes 1, 1A, 5, 6, 6A, and 7 when measured in accordance with 4.5.15, shall be: a. Type II, class 1 and class 1A when measured at a temperature of 75 2 F and at 6 revolutions per minute (rpm), shall be
24、 12,000 to 16,000 cycles per second (cps). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-6799L 5 b. Type II, class 5, when measured at a temperature of 75 2 F and at 6 rpm, shall be 2,000 to 5,000 cps. c. Type II, class 6 and class 6A using
25、 an LVT model viscometer when measured at a temperature of 75 2 F and at 118 2 F shall be: at 60 rpm 450 to 950 cps at 6 rpm 2,000 to 6,000 cps at 0.3 rpm 20,000 to 60,000 cps and when measured at 45 2 F shall be: at 60 rpm 450 to 1,800 cps at 6 rpm 2,000 to 7,000 cps at 0.3 rpm 20,000 to 60,000 cps
26、 d. Type II, class 7, measured at a temperature of 75 2 F shall be: at 0.3 rpm 600,000 to 900,000 cps at 1.5 rpm 180,000 to 280,000 cps TABLE I. Individual component physical properties. Physical Property Requirement Test Method Paragraph Type II, Class 1 namely, a combination of class 1 or 1A with
27、class 5, and a combination of class 1or 1A with class 6 or 6A. 4.4.3.1.1 Class 1or 1A with class 5 system. Class 1 or 1A, black, basecoat material shall be applied in one horizontal pass and one vertical pass and allowed to air dry for one hour. This procedure shall be repeated until a total class 1
28、 or 1A dry film thickness of 9 mils has been applied. After a minimum drying period of 2 hours, the class 5 material shall be applied over the class 1 or 1A material. Class 5 material shall be applied in one horizontal pass and one vertical pass to a dry film thickness of 3 1 mils. Total dry film th
29、ickness shall be 12 1 mils. 4.4.3.1.2 Class 1 or 1A with class 6/6A system. Class 1 or 1A, black, basecoat material shall be applied in one horizontal pass and one vertical pass and allowed to air dry for one hour. This procedure shall be repeated until a total class 1 or 1A dry film thickness of 9
30、mils has been applied. After a minimum drying period of 2 hours, the class 6/6A material shall be applied over the class 1 or 1A material. Class 6 or 6A material shall be applied in one horizontal pass and one vertical pass to a dry film thickness of 6 1 mils. Total dry film thickness shall be 15 1
31、mils. 4.4.4 Mechanical mixing. All samples to be tested in 4.5 shall be mechanically mixed with a motorized impeller for a minimum of 30 minutes. 4.5 Test methods. 4.5.1 Chemical attack. Three 1 x 4 x 0.125 inch plastic strips shall be cleaned as specified in 4.4.1 and then immersed to one-half of t
32、heir length in a screw-top bottle containing the coating, the lid tightened, and bottle stored for 24 hours at a temperature of 100 3 F. The strips shall then be removed and examined for attack on the plastic. The coating shall meet the requirement as specified in table I. Provided by IHSNot for Res
33、aleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-6799L 10 4.5.2 Nonvolatile content. The nonvolatile content shall be determined in accordance with ASTM D2369 and shall meet the requirement as specified in table I. 4.5.3 Delivery rate. A DeVilbiss MBC spray gun using a
34、 type FF fluid tip, a No. 765 air cap, and a maximum fluid-nozzle screw adjustment shall be used. The line pressure shall be 55 to 75 psi, and the cup pressure shall be 16 psi. One quart of coating shall be placed in a pressure feed cup and sprayed into a graduated cylinder. The volume of coating de
35、livered in 1 minute shall be noted. In the absence of the DeVilbiss MBC spray gun, airless spray equipment such as the Grayco Bulldog Model #205-591 (or equivalent as approved by the qualifying activity) gun having a standard reverse-A-clean tip with an orifice between 0.017 and 0.021 and a spray an
36、gle between 40 degrees to 80 degrees shall be used. The delivery rate shall meet the requirement as specified in table I. 4.5.4 Vertical application. The coating shall be placed in a pressure feed cup and sprayed with a gun described in 4.5.3 on a vertical plastic panel. The gun shall be held perpen
37、dicular to and 6 to 10 inches from the panel and shall be adjusted so that one application of the coating produces the required thickness (see table I). The panel shall be examined for sagging of the coating and shall meet the requirements as specified in table I. 4.5.5 Drying time. Four 4 x 8 x 0.2
38、50 inch plastic panels shall be coated individually as follows: Type II, classes 1 or 1A and 5 shall be coated to a thickness of 3 1 mils; type II, class 6 or 6A A shall be coated to a thickness of 6 1 mils and type II, class 7 shall be coated to a thickness of 12 2 mils. The coated panels shall be
39、conditioned at a temperature of 70 1 F and 65 percent relative humidity for the required drying time (see table I). After each application, the coating shall be dry to touch within the maximum time as specified in table I. 4.5.6 Craze attack on plastic. Six machined plastic panels, each 1 x 7 x 0.25
40、0 inch, cleaned as specified in 4.4.1, shall be set up as cantilever beams as shown on figure 1, and stressed to 2,400 psi. The formula for calculating load shall be as indicated on figure 1. Ten minutes after the beams have been loaded and while still under load they shall be examined for crazing.
41、Three panels under stress shall then be coated on the top side by applying a puddle of the coating to the stressed plastic, taking care not to expose the side of the specimen, and shall be allowed to air dry for 24 hours. Three uncoated panels shall be used as a control. At the end of the exposure t
42、ime, the stress shall be removed, the coatings stripped, and all panels examined for crazing. All panels shall meet the requirements specified in table II. In the event the control panels craze, tests shall be repeated. All craze appearing at the edges of the specimen shall be disregarded unless the
43、y extend 0.125 inch or more from either edge of the specimen. 4.5.7 Adhesion, initial (as received). Five bare plastic panels, and five aluminum panels painted as described in 4.5.12.1e, each 1.5 x 6 x 0.125 inches, shall be coated as specified in 4.4.3. The panels shall then be allowed to air dry 2
44、4 hours prior to testing. A one-inch-wide strip shall be cut only through the coating and parallel to the long dimension of the panel Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-6799L 11 (allowing 0.25 inch on each side). One end of the 1
45、 inch strip of coating shall be loosened from the panel (not more than 1 inch) and a leader attached. The panel shall be clamped in one jaw of a pendulum-type testing machine and the free end of the leader pulled back 180 degrees and clamped in the other jaw. The testing machine shall have at least
46、a 4-pound range, and the rate of jaw separation shall be 2 inches per minute. The load required to remove the strip of coating from the panel shall be recorded for each panel and the average load in ounces per inch of width reported for each type of panel. The coating adhesion shall meet the require
47、ment as specified in table II. 4.5.8 Adhesion after accelerated drying. Five bare plastic panels, and five aluminum panels painted as described in 4.5.12.1e, each 1.5 x 6 x 0.125 inches, shall be prepared as specified in 4.4.3, and allowed to air dry 24 hours prior to testing and then subjected for
48、100 hours to accelerated drying by exposure in a desiccator (containing fresh anhydrous calcium chloride) at a temperature of 120 2 F. The coating shall be removed from each panel as specified in 4.5.7. The load required to remove the strip of coating from the panel shall be recorded for each panel
49、and the average load in ounces per inch of width reported for each type of panel. No residue shall be left on the surface of the plastic or painted aluminum. The coating adhesion shall meet the requirement as specified in table II. 4.5.9 Adhesion after exposure to high humidity. Five bare plastic panels, and five aluminum panels painted as described in 4.5.12.1e, eac
