1、- I TT-R-248B October 29, 1981 SUPERSEDING Fed. Spec. TT-R-248A January 17, 1967 I 1. FEDER! iL SPECIFICATION REMOVER, PAINT AND LACQUER, SOLVENT TYPE This specification was approved by the Commissioner, Federal Supply Service, General Service Administration, for the use of all Federal Agencies. SCO
2、PE I 1.1 Scope. This specification covers a nonflammable, water rinsable, solvent rpe pai 2. .nt- and -lacquer remover (see 6. APPLICABLE DOCUMENTS I 2.1 The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the e
3、xtent speci- .ed her ein. Federal Specifications: P-c-444 QQ-A-250/4 QQ-A-25015 QQ-A-250/13 QQ-M-44 QQ-P-4 16 TT-E-489 TT-P- 175 7 TT-T-2 9 1 LLL-P-400 PPP-B-636 PPP-D-729 PPP-P-704 -Cleaning Compound, Solvent Soluble, Grease -Aluminum Alloy 2024, Plate and Sheet. -Aluminum Alloy Alclad 2024, Plate
4、and Sheet. -Aluminum Alloy Alclad 7G75, Plate and Sheet. -Magnesium Alloy Plate and Sheet (AZ31B). -Plating, Cadmium (Electrodeposited). -Enamel, Alkyd, Gloss (For Exterior and Interior -Primer Coating, Zinc Chromate, Low-Moisture-Sensi- -Thinner, Paint, Mineral Spirits, Regular and Odor- -Pine Oil.
5、 -Boxes, Shipping, Fiberboard. -Drums, Shipping and Storage, Steel 55 Galloll -Pail, Metal (Shipping, Steel, 1 through 12 Emulsifiying. Surfaces). t ivity . less. (208 Liters) . Gallonsr. Federa.1 Standards : Fed. Test Method -Paint, Varnish, Lacquer and Related Materials, Std. No. 141 Methods of In
6、spection, Sampling and Testing. Fed. Std. No. 313 -Material Safety Data Sheets, Preparation and the Submission of. FSC 8010 M Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(Activities outside the Federal Government may qbtain copies of Federal spec
7、ifi- cations, standards, and commercial item descriptions, as outlined under General Infor- mation in the Index of Federal Specifications, -Standards, and Commercial Iten Descrip- tions. The Index, which includs cumulative bimonthly supplements as issued, is for sale on a subscription basis by the S
8、uperintendent of Documents, U.S. Government Printing Office, Washington, DC 20402 -. (Single copies of this specification and other Federal specifications, st-andards, and commercial item descriptions required by activities outside the Feder1 Government for bidding purposes are available without cha
9、rge from General Services Administration Business Service Centers in Boston; New York; Philadelphia; Washington,. DC; Atlanta; Chicago; Kansas City, MO; Fort Worth; Houston; Denver; San Francisco; Los Angeles; and Seattle, WA. - -etock) and heat treated to an average strength level of 230,000 psi (1
10、.6,X 10 Pa) and finished to the final dimensions shown in Figure 3. 4.5.4.3.2 Test procedure. The rings are Cadmium plated for 2 minutes at 50 amperes per square foot. Following plating, the specimens are baked for 24 hours at 190 f 3OC (374O k 5.4OF). These baked rings stressed to 75 percent of the
11、ir notched tensile strength are completely immersed in the test sample for one minute. The rings are then removed and allowed .to stand in air for the required 100-hour testing time. No rinse of any kind is used to clean off the rings after dipping. The rings shall not break during the 100-hour test
12、ing period. 4.5.5 Accelerated storage stability and appearance test. 4.5.5.1 Preparation of test sample. A 5-ounce (I41 75 g) portion of well shaken remover shall be poured into each of two chemically clean 12-ounce (354.9 ml) pressure resistant clear glass bottles and carefully capped. The bottles
13、shall be approximately 9-1/2 inches (24.13 cm) in height, with shoulders 2-1/2 inches (6.35 cm) in outside diameter and 5 inches (12.7 cm).from the base. 4.5.5.2 Procedure. “ “ 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-x INTERNAL I- 1.98 (5.
14、03) - i “- “ “_ h 1.25 _. (3.18) NOTE: DIMENSIONS IN INCHES (CM) FIGURE 3. Notched C-ring (AIS1 4540 steel). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . . . I . “ ._:_ ,I . I_ . 4.5.5.2.1 Cold cycle test. One bottle shall be. stored in the da
15、rk for at least 6 days. The other bottge shall be placed ina water bath maintained at a tempratr?“ 54 .? 3 C(129- 4 5.4- F) fpr 1 hour. 1:; ?he bottle in the watey bath - shal“be. caref7.1yr removed and allowed to cool it .ropm. temperatre for 1 .hour ,and then if$s$aliy examined.; If any.layer foim
16、ationlis,evident, the bottle shall be thoroughly then; allowed to remain. undisturbed at room tempera- ture for 1 hour“; . If the layer formation persists,. the material shall be considered . nsatlsfactbry d *hrChr I testing discontinued. If the remover appears homogeneous, theObOttle $hall be place
17、d -ln. a coldbox.maintained at: a temperature f. -10 3C (14 2 5.4OF) for 1 hour, after which it Shall be removed and allowed to remain undisturbed E at room temperature- for 1 hour. The remover shall. again be .examined for homogeneity: If layer :formation is vident,.-the sample shall be Ghakenand a
18、llowed to stand un.disturbed*f. 0,020 by 1/2 by 6 inches (0.05 by -1-,27- by -1524.-c);. c.onforming to MIL-S-7952, shall be polished with polish im- pregnated wadding - to remove-surface contamination-. The steel strip sha.11 then be cleaned as specified in: 4, S. 4.1 -. The steel strip shall be pa
19、rtially immersed in the remover contained in th test bottle. In subsequent operations, the bottle shall be handled car$fully to aGoid sloshing of remover onto the steel strip. The bottle shall be capped placed: in an oil bath, and heated at uniform rate to a tempera- ture of 60 (+ 3 C -( 149: + 5 .,
20、40F), within 5 hours. Ir shall be held at this tempera- ture for 3 fiours. The bottle shall Gemain in the bath and the heating procedure shall be reieated each day. for five days No .heat shall be supplied to the bath overnight. On the morning of the sixth day, the bottle shall be removed from the b
21、ath, uncapsed and the steel strip carefully withdrawn without disturbing the re- mover. The strip -shall. be rinsed with tapwater and- dried. The. remover shall be compared with the remover in the original bottle stored in a dark place. Any difference in appearance, such as lager separation and-evid
22、ence E polymerization shall be noted. The opiened bottle sball be capped and the two. bottles shall be throughly shaken for 1 minute, then allowed to remain Undisturbed for 1 hour at room temperature, and then examined for any variation in, appearance between the two samples; If considered satisfact
23、oryi the remover which has -been. heated as stated above, shall; be tested also for paing stripping efficiency;. The portion of- the steel strip whidh -had been immersed in the remover shall be examined for evidence of pitting, co. .The rate of flow shall be 4 gallons of water per minute, and the du
24、ration of rinsing shall be lminute. - The rinsing shall be accomplished while the panel is moving back and forth -in a. horizontal plane 2 inches (5.08 cm) below the glass tubing outlet. Bsshing . - shall not be employed. The wet panel shall be. examined for res-?due and water- . .- break. The panel
25、 shall then be dried in the. oven for 15 minutes -at. 71Q F 3OC- -1 (160O 4 5.4OF). Allow it to cool. -at room temperature, and re-gxanrihe for . residue. When noticeable water break and residues occur, the paneX=surfake -. . shall then be finished in accordance with table III. The finished . - ., .
26、 . . L . -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-T T -R -24 BB 80 m 777 TT-R-248B surface shall then be examined for evidence of a tack-free film. A tack-free film is defined in method 4061 of Federal Standard No. 141. The adhesion of the
27、finish shall be determined in accordance with the knife test, method 6304 of Federal Standard No. 141 and shall be compared with the adhesion of the finish on a new panel finished at the same time. Panel B shall be subjected to the same procedure as panel A, except that agter being coaJed with paint
28、 remover, it shall be placed in an oven at 45 4 3 C (113 4 5.4 F) for 15 minutes before rinsing. Panel C shail be placed in a horizontal position and coated with paint remover which is draining from an L-52 lacquered panel while the latter is being coated with the test sample in accordance with 4.5.
29、6.3, except that a 20 ml sample shall be poured over the entire area of an unmasked L-52 panel. After the remover has been allowed to act upon the lacquer surface for 30 minutes, the loosened finish and remover residue shall be scraped with a spatula and trans- ferred to panel C. The material thus d
30、eposited on panel C shall be carefully distributed evenly over the entire surface without exerting any pressure. Panel C shall then be rinsed and examined as panel A. Panel D shall be subjected to the same procedure as panel C, egcept tpt just before the rinsing, it shall be placed in an oven at 45
31、k 3 C (113 4 5.4OF) for 15 minutes. 4.5.10 Carbon removal properties. 4.5.10.1 Carbon remover control formula. The control formula shall have the following composition: Ingredient Percent by weight Cresol USP Potassium oleate (anhydrous) Water .67 25 8 4.5.10.2 Procedure. A thoroughly used carbon co
32、vered aluminum alloy aircraft engine piston shall be cut into 8 equal sections. Piston sections utilized in this test shall be selected from the same piston in such a manner that two similar sections coated with approximately equal amounts of carbon will be used. One piston section shall be immersed
33、 in the paint remover under test for a few seconds to allow the compound to penetrate all holes and grooves. After withdrawal, the section shall be suspended and allowed to drain for 30 minutes. The section shall then be brushed with a soft bristle,brush (type- writer. brush), saturated with water.
34、The pressure applied in brushing shall be sufficient to insure contact of the bristles with all crevices, ridges and holes. The section shall then be thorougly rinsed with tapwater accompanied by brushing until all loosened carbon is removed. A second piston section shall be immersed for 30 minutes
35、in an aqueous solution of one gart carbon remover con- trol formula and 4 parts water at a temperature of 60 k 3OC (140 +_ 5.4F). After the immersion period, the piston section shall be removed, scrubbed with a brush and then Sinsed with tapwater. The two piston sections shall be examined, and compa
36、red. 20 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TT-R-248B 4.5.11 Storage stability. One gallon (3.8 liters) of the remover shall be stored in a glass bottle to which have been added clean steel strips, conforming to MIL-S-7952. The total surf
37、ace area (both sides) of the steel shall be equi- valent to 100 square inches (645.2 sq cm). The bottle shall be protected from the light and stored for 1 year at 2l0 k 3C (69.8O f 5.4OF). After such sto- rage, the remover shall be subjected to all of the above tests except the accel- erated storage
38、 stability test. 4.5.12 Service test. The service test performed by a Naval Air Station designated by the activity responsible for qualification, shall consist of field evaluation of the service test sample under service conditions conducted in accordance with standard operating procedures on as man
39、y aircraft as needed to determine suitability of the product for military use. The service test shall be performed when the paint remover has met all the requirements of section 3, including storage stability. 5. PREPARATION FOR DELIVERY 5.1 Civil agencies. 5.1.1 Packaging. Packaging shall be level
40、A or Comercial, as specified (see 6.2). 5.1.1.1 Level A. The paint remover shall be packaged in 1, 5, or 55-gallon (3.8, 18.9 or 208.2 ml) containers respectively, as specified (see 6.2). The 1-gallon container shall conform to PPP-C-96, type V, class 4 with a metal screw cap closure. The cap shall
41、have an inner friction metal seal, The cap shall be secured by mechanical means or by a cap wrench. External plan B coating and side seam striping are required. The 1-gallon container shall be provided with a formed bridge type handle or a wire handle which has been gal- vanized or otherwise coated
42、to r.esist corrosion. The 5-gallon quantities of the paint remover shall be packaged in metal pails conforming to PPP-P-704, type I, class 3. The 55-gallon quantities of the paint remover shall be packaged in drums conforming to PPP-D-729, type I, class A, or type II. 5.1.1.2 Commercial. The paint r
43、emover in the unit quantities specified shall be packaged in accordance with normal commercial practice. The complete package shall be designed to protect the item against damage during shipment, handling and storage. 5.1.2 Packing. Packing shall be level A or commercial, as specified (see 6.2). 5.1
44、.2.1 Level A. Six 1-gallon cans of remover, packaged as specified in 5.1, shall be packed in close-fitting boxes conforming to PPP-B-636, grades VC, V3s or V2s. The boxes shall be closed, waterproofed and reinforced in accor- dance with the appendix to PPP-B-636. .Alternatively, wirebound, cleated p
45、lywood or nailed wood boxes shall be acceptable shipping containers when lined with a waterproof barrier material. The barrier material shall be sealed at the edges with waterproof tape or adhesive. The 5-gallon and 55-gallon- quantities shall be packaged in containers as specified in 5.1.1.1. 5.1.2
46、.2 Commercial. The remover shall be packed in a manner that will assure acceptance by common carrier and provide product protection against loss and damage during multiple shipments, handling and storage. The shipping con- tainer shall be in compliance with the National Motor Freight Classification
47、and Unifrom Freight Classification. 21 . . _. . -, . 1 .I .- . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5.1.3 Marking Marking shall-be as specified in the contract or order. 5.2 -,Wlitar.y activities. 5.2,l Packaging. Packaging shall be level
48、A or Commercial, as specified (see 6.2). 5.2.1.1 Level A. Unless otherwise specified, the paint remover shall be furnished in 5-gallon pails conforming to type I, class 3 of PPP-P-704 with a flexi- ble spout closure. All interior-surfaces of the container shall be coated with 8 lining that will not
49、effect nor be affected by the paint remover. 5.2.1.2 Commercial. The paint remover shall be packaged in compatible con- tainers in the specified quantities in a manner that will afford.adequate protection necessary to prevent contamination and damage during shipment under environmental conditions, utilizing containers required by the Code of Federal Regulations, Title 49, Parts 100-199.
