1、I I* MILITARY SPECIFICATION LACQUER, PURPLE MI L-L-296B M I L- L- 296A 12 April 1965 This specification is mandatory for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type and grade of purple lacquer for sealing the flash holes of
2、 primer extension tubes and as a waterproofing agent for artillery ammunition primers. It is suitable for use in areas covered by Air Pollution Regulations. 2. APPL I CABLE DOCUMENTS 2.1 The following documents of the issue in effect on the date of i-nvita- tion for bids or request for proposal, for
3、m a part of the specification to the extent speci fi ed herei n. SPEC1 FI CATIONS Fede ra 1 .bTT-P-143 - Paint, Varnish, Lacquer and Related .Materials; Packaging, Packing and Marking of. STANDARDS Federa 1 Fed. Test Method Std. No. 141 - Paint, Varnish, Lacquer and Related Materials; Methods of Ins
4、pection, Sampling, and Testing. THIS DOCUMENT CONTAINS _$PAGES. -7 , .J , ,._I . Licensed by Information Handling ServicesMIL-L-276B 0 m 7777706 0096023 2 m Mi L-L-2968 (Copies of specifications, standards, drawings, and pub1 ications required by suppliers in connection with specific procurement fun
5、ctions should be obtained from the procuring activity or as directed by the contracting off i ce r . ) 3. REQU I REMENTS 3.1 Composition. The lacquer shall be nitrocellulose, castor oil and dibutyl phthalate combined with methyl violet dye- and necessary amounts of solvents to yield a product confor
6、ming to the requirements of this speci fi cat i on. 3.T.1 Volatile content. The volatile content shall also conform to the following requirements by volume when tested as in 4.4.4. (a) (b) (c) A combination of ethyl benzene, ketones having branched hydro- (d) Total of a + b + c: 20 percent maximum.
7、Solvents having an olefinic or cyclo-olefinic type of unsaturation: A combination of aromatic compounds with eight or more carbon 5 percent maximum. atoms to the molecule except ethyl benzene: carbon structures, or toluene: 8 percent maximum. 20 percent maximum. 32 Quantitative requi rements. The la
8、cquer shall conform to the re- quirements of Table I when tested as in 4.4. TABLE I. Quanti tative requirements Req u i remen t s Minimum Maximum Total solids, percent by weight of lacquer Nitrocellulose, percent by weight of vehicle solids Dibutyl phthalate, percent by weight of vehicle solids Cast
9、or oil as fatty acids, Castor oi 1 Water, percent by weight of lacquer Viscosity, reduced, No. 4 Ford cup, seconds Dry ng ti me i mi nutes percent by weight of vehicle solids Dust free Dry through 53 57 50 54 5. 13 39 Pos tive 35 70 90 3 7 10 1 .o - - -Methyl violet dye cons methylated pararosani 1
10、and hexamethyl derivat sting af a mixture of hydrochlorides of highly nes, containing principally the tetra-, Penta-, ves. o Licensed by Information Handling Servicesi MIL-L-29bB 0 M 777970b 0096024 4 . . MI L-L-296B 3.3 Qual i tat i ve requi rements. 3.3.1 Condition in container. When tested as in
11、4.4.7 the lacquer shall be clear and free from sediment and suspended matter when examined by trans- mitted light. It shall show no livering, curdling, gelling r skinning in a freshly opened full container. 3.3.2 Color. When tested as in 4.4.8 the color of the dry film shall be distinctly purple and
12、 shall approximate the color of the dry film of test 1 acq ue r . 3.3.3 Flexibility. When tested as in 4.4.9 a film of lacquer sha withstand bending without cracking or flaking. 3.3.4 Knife-test. When tested as in 4.4.10 a film of lacquer sha tightly and not flake, crack, or powder from the metal. T
13、he cut sha beve led edges. 1 1 adhere 1 show 3.3.5 Filmtest. When tested as in 4.4.11 the dried film shall be uniform and show no breaks or voids across the holes. 4. QUAL I TY ASS URANCE PROVI S I ONS 4.1 Responsibility for inspection. Unless Otherwise specified in the contract or purchase order, t
14、he supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the suppl-er may use his own or any other faci 1 i ties sui table for the performance of the inspection requi rements specified herein, unless di
15、sapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the speci- fication where such inspections are deemed necessary to assure supplies and servi ces conform to prescribed requi rements. 4.2 Sampling; inspection and testing. Unless otherwise s
16、pecified, sam- pling, inspection and testing shall be in accordance with method 1031 of Fed. Test Method Std. No. 141. 4.3 Testing, Testing under this specification shall be for acceptance of individual lots. The right is reserved to make any additional tests deemed ;. necessary to determine that th
17、e lacquer meets the requirements of the speci- fication. - 4.3.1 Composition. Unless otherwise specified, the contractor may furnish cert i fi cat i on of compl i ance w i th the requi rements for ni troce1 1 u 1 ose, di butyl phthalate, castor oil, castor oil fatty acids, and solvents in lieu of pe
18、r- 7501 of Fed. Test Method Std. No. 141. The certification shall be accompanied by batch production data in accordance with method 1031 of Fed. Test Method Std. No. 141. -forming the tests required in 4.4.3.3, 4.4.3.4, 4.4.3.5, 4.4.4, and Method - 3 Licensed by Information Handling ServicesMIL-L-29
19、bB BO m 9999906 0096025 6 m . I MI L-L-296B 4.4 Test methods. 4.4.1 Test conditions. The routine and referee testing conditions shall be in accordance with section 7, Fed. Test Method Std. No. 141 except as otherwise specified herein. 4.4.2 The following tests shall be conducted in accordance with a
20、pplicable methods of Fed. Test Method Std. No. 141 or 3s hereinafter specified. TABLE I I. Index Test Method Appl icable Paragraph of Paragraph of method in Fed. this specifica- this specifica- Test Method tion giving fur- tion giving I tem Std. No. 141 ther references requirements Total solids Nitr
21、ocellulose Dibutyl phthalate Castor oi 1, fatty acids Castor oil Sol vents , quant i tat i ve Water viscos i ty D ry i ng t i me Dust free Dry th rough Condition in container Color Flex b i 1 i ty Knife test Fi lm test 4044 - - - 750 1 7360 40 82 4282 406 1 406 1 301 1 - 622 1 6 304 - 4.4.3.2 4.4.3.
22、3 4.4.3.4 4.4.3.5 4.4.4 4.4.5 4.4.6 4.4.6 4.4.7 4.4.8 4.4.9 4.4.10 4.4.11 - - Table I Table I Table I Table I Table I 3.1 Table I Table I Table I Table I 3.3.1 3.3.3 3.3.4 3.3.5 383.2 4.4.3 Analysis of nonvolatile. 4.4.3.1 .Preparation of sample. Quantitatively dilute about 50 grams of lacquer with
23、approximately 20 percent by weight of lacquer thinner conforming drawn for analysis. to Table Ill, Mix well and apply necessary correction to all samples with- *- 4.4.3.2 Nonvolati le. Determine nonvolatile content of lacquer reduced as in 4.4.3.1 in accordance with method 4044 of Fed. Test Methqd S
24、td. No. 141. 4 Licensed by Information Handling ServicesmIL-L-29bB 80 9999906 0096026 8 - . M 1 L-L-296B 4.4.3.3 Nitrocellulose. Record the weight of a dry 250 ml. Erlenmeyer flask containing a boiling stone. Weigh 1.5 to 2.5 grams of the thinned lacquer. into the tared flask and dissolve sample in
25、25 ml. of acetone. benzene slowly while sample is being swirled. attach a water cooled condenser in such a way as to al low the disti llate to be collected in a graduated cylinder without evaporation taking place. till until 75 ml. of distillate are collected. Cool the flask to room tem- perature an
26、d filter through a Gooch crucible previously dried and weighed, containing a thick mat of asbestos. Transfer and wash the precipitate with benzene. Collect the filtrate in a clean dry suction flask and hold for the determination of dibutyl phthalate. Dry Gooch crucible and flask containing boiling s
27、tone at 110OC. (23OOF.) for one hour. Combine the i crease in weight of crucible and flask and calculate the percent of nitrocellu ose. Add 140 ml. of Place flask on a heater and Dis- Percent nitrocellulose = weight of precip tate X100 weight of nonvolatile sample 4.4.3.4 Dibutyl phthalate. Ref Iter
28、 the filtrate from the nitrocellulose determination through filter paper of fine porosity into a 500 ml. Erlenmeyer flask. Add 100 ml. of absolute ethanol and50 ml. of freshly prepared and filtered 1.0 normal potassium hydroxide in absolute ethanol. hours and cool to room temperature. previously dri
29、ed and weighed, containing a thin mat of asbestos. and wash precipitate with absolute ethanol. suction flask and hold for the determination of fatty acids. at 110OC. (230F.) for 1 hour, cool in desiccator and weigh. Calculate the dibutyl phthalate content using the fol lowing eqcation: Percent dibut
30、yl phthalate = weight of precipitate X 1.15 X 100 Reflux for two Filter the sample through a Gooch crucible, Transfer Dry the crucible Col lect the fi 1 trate in a clean weight of nonvolati le sample 4.4.3.5 .Castr oil fatty acids. Transfer the filtrate from the dibutyl phthalate analysis into a 600
31、 ml. beaker with water and evaporate the sol- vents on a steam bath keeping the volume above 25 ml. by the addition of water. After the organic solvents have been evaporated, transfer the con- tents of the beaker to a 500 ml. separatory funnel and dilute to 200 ml. with water. Add 18 N sulfuric acid
32、 until the system is strongly acid to litmus paper. consecutive volumes of ethyl ether. 25 ml. portions of water until acid-free. rapid fi 1 ter paper that is wet with ethyl ether into a tared 250 ml . beaker. After the ethyl ether has been evaporated, dry the fatty acids under vacuum at 80C. (176F.
33、) until constant weight is obtained. Calculate the percent of fatty acids as follows: Extract by shaking vigorously with 75-, SO-, and 50-1111. Combine ether extractions and wash with, Filter the ethyl ether through Percent fatty acids = weight of fatfy acids X 100 weight of nonvolatile sample R Lic
34、ensed by Information Handling ServicesI MIL-L-2968 AO W 9939906 0096027 T W i . MI L-L-296B i 4.4.4 Solvent analysis. Determine solvent as in method 7360 of Fed. Test Method Std. No. 141. Samples that fail to meet the requirements of 3.1.1 shal1,be subject to further examination using a six foot sil
35、icone nitrile column (20% XF-1150 on 60 to 80 mesh Chromosorb W). 4.4.5 Viscosity (reduced). Reduce one part by weight of the packaged material with one part by weight of thinner conforming to Table 111. for compliance with Table I. Check TABLE 111. Thinner 8 Approx. Percent Percent Ingredient . by
36、weight by volume To1 uene Normal butyl acetate Normal butyl alcohol . Heptane i9 35 15 31 17 32 . 15 . 36 4.4.6 Drying time. Determine drying time in accordance with method 4061 of Fed. Test Method Std. No. 141 using referee conditions. 4.4.7 Condition in container. Determine package condition in ac
37、cordance with method 3011 of Fed. Test Method Std. No. 141 and observe for coypliance I - with 3.3.1. . Licensed by Information Handling ServicesI - MIL-L-2968 80 9999706 0076028 L . L MI L-L-296B 4.4.8 Color. Using a 0.0020 inch (0.0040 inch gap clearance) film appli- cator draw down a film of the
38、lacquer under test and test lacquer in Table IV on a clear plate glass panel and air dry 24 hours, with 3.3.2. Examine for compliance .TABLE IV. Test lacquer Percent I ng red i etit . by weight 1/2 second R.S. nitrocellulose (65 percent in ethanol) Dibutyl phthalate Castor oi 1, blown Methyl isobuty
39、l ketone Methyl isobutyl carbinol Isopropyl alcohol (99 percent) To1 uene Methyl violet dye 44.0 5.0 21.5 9.2 2.4 3.3 . 14.5 o. 1 Dissolve the ni troce1 lulose in the given solvents, then add the remainder of the ingredients. . 4.4.9 Flexibility. Determine flexibility in accordance with method 6221
40、-of Fed. Test Method Std. No. 141. Apply a 2-inch wide film of lacquer with a film applicator that will give a dry film thickness of 0.0009 to 0.0011 inch on a smooth finish steel panel prepared in accordance with method 2011 of Fed. Test Method Std. No. 141 using the aliphatic naphtha-ethylene glyc
41、ol monoethyl ether mixture. The panel shall be prepared from new cold rolled carbon steel rust-free 0.010 + 0.001 inch thick with a Rockwell 15-T maximum hardness of 82 and finished wTth g surface roughness of 8 to 12 microinches. Air-dry the lacquer in a horizontal position for 1/2 hour and then ba
42、ke for .6 hours at 105“ + 2C. (221“ + 4F.). Condition the panel for 1/2 hour I under referee conditions. for cracks over. the area of the bend in a strong light at a 7-diameter mag- nification for compliance with 3.3.3. Bend over a 1/8 inch mandrel. Examine the coating 4.4.10 Knife fest. Perform the
43、 knife test in accordance with method 6304 of Fed. Test Method Std. No. 141 using a flat portion of the baked panel from the flexibility test. Observe pliance with 3.3.4. 7 Licensed by Information Handling ServicesNIL-L-29bB 80 9979906 O096029 3 grid of ?O or more holes 0.14 inch in diameter and 0.7
44、5 inch apart. Place the panels on a piece of white paper cut to the same size as the panels. Pour approximately 15 ml. of lacquer across each panel above the holes. Using a 0.0015 inch (0.0030 inch gap clearance) film applicafor, draw down a3 inch wide film of the lacquer so that the surface is just
45、 covered and . . MIL-i-296B . 4.4.11 Film t ance with method 5. PREPARATION FOR DELI VERY 5.1 Packaging, packing and marking. The lacquer shall be packaged, packed and marked in accordance with TT-P-143. The level of packaging shall be A or C and the level of packing shall be A, B, or C as specified
46、 (see 6.2). The primer shall be furnished in i-quart or 1-gallon multiple friction top con- specified (see 6.2). . tainers, in 5-gallon lug cover steel pails or in 55-gallon steel drums as 6. NOTES 6.1 Intendeduse. The lacquer covered by this specification is intended for use in sealing the flash ho
47、les of primer extension tubes and as a water- proofing agent for artillery ammunition primers. 6.2 Ordering data. Procurement documents should specify the fol lowing: (a) Title, number and date of this specification. (b) Size of containers (see section 5): (c) Level of packaging and level of pack 6.
48、3 The lacquer covered by this specificat volume, the unit being one United States liqu . at 68F. (20C.). ng (see sect ion 5). on should be purchased d gallon of 231 cubic by nches Cus tod i an : Army - MR Revi ew act i vi t i es : Aimy - MR, MU U, S. GOVERNMENT PRINTING OFFICE 1973-714-546/5883 8 P repar i ng act i vi ty : Army - MR (Project No. 8010-0440) I. - Licensed by Information Handling Services
