ARMY A-A-50177 B-2007 PAPER LENS《纸质镜头》.pdf

《ARMY A-A-50177 B-2007 PAPER LENS《纸质镜头》.pdf》由会员分享，可在线阅读，更多相关《ARMY A-A-50177 B-2007 PAPER LENS《纸质镜头》.pdf（4页珍藏版）》请在麦多课文档分享上搜索。

1、 A-A-50177B 19 MARCH 2007 SUPERSEDING A-A-50177A 03 OCTOBER 2002 COMMERCIAL ITEM DESCRIPTION PAPER, LENS The General Services Administration has authorized the use of this commercial item description by all federal agencies. 1. SCOPE 1.1 Classification. This commercial item description covers non -a

2、brasive lens paper in the following types and classes: Type I Cleaning paper Class 1 Lightweight Class 2 Medium weight Class 3 Heavyweight, silicone treated Class 4 Heavyweight, wet-strength Class 5 Lightweight, wet-strength Type II Wrapping or covering for coated optical surfaces. 1.2 Sizes. Sizes

3、shall be specified in the order or contract . 2. SALlENT CHARACTERISTICS 2.1 General. Type I, classes 1, 2, 4, and 5 paper shall be white Type I, class 3 paper shall be lavender. Type II paper shall be white or natural. 2.2 Type I. 2.2.1 Classes 1, 2, and 4. Classes 1, 2, and 4 paper shall be made f

4、rom bleached chemical wood pulp, cotton, rayon, or hemp fibers, or mixtures of these. They shall not be contaminated with any unbleached or mechanical wood pulp. The formation shall be uniform and open. AMSC N/A FSC 6640 Beneficial comments, recommendations, additions, deletions, clarifications, etc

5、. and any other data that may improve this document should be sent to: Commander, US. Army Aviation and Missile Command, ATTN: AMSRD-AMR-SE-TD-ST, Redstone Arsenal, AL 35898-5000. INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50177B

6、2.2.2 Class 3. Class 3 paper shall be made from 100 percent bleached chemical wood pulp. The formation shall be uniform and dense. 2.2.3. Class 5. Class 5 paper shall be made from 1.5 denier viscose rayon fibers at least 3/16 inch long, hemp fibers or mixtures of these with cellulosic or cellulose d

7、erivative binding agents, and shall be free from wood pulp. 2.3 Type II. Type II paper shall be made from either white or unbleached wood pulp, and shall be free of ground wood particles. 2.4 Physical and chemical requirements. The paper shall conform to the physical and chemical requirements specif

8、ied in Table I. TABLE I. Physical and chemical properties. 1/ TAPPI Technical Association of the Pulp and Paper Industry 2/ Requirement is for 10 sheets tested together. 3/ T435 or T509 4/ After removal of silicone content 5/ See 2.4.1 2 Provided by IHSNot for ResaleNo reproduction or networking per

9、mitted without license from IHS-,-,-A-A-50177B 2.4.1 Commercial test. Ignite a 30 ml Vycor or equal micro-Kjeldahl flask at 1000 C, cool in a dessicator and weigh to the nearest 0.1 milligram. Support the flask in a water bath at 75 2 C, with the level of the water about half way up the neck of the

10、flask. Above the flask, suspend a funnel with filter paper to allow maximum free space at the neck and mouth of the flask for vapor dissipation. Adjust the position of the funnel so that the tip rests against the wall of the flask. The effluent should not drip but flow gently down the inner wall of

11、the flask. Fit a 125 ml graduated separatory funnel with a Teflon (or equal) plug-cock and attach a spring tension adapter. Cut a 5 gram sample of lens cleaning tissue into inch to 1 inch squares, weight to the nearest 0.1 milligram and place in the separatory funnel. Cover the tissue with 75 ml of

12、methylene chloride and agitate for 1 minute. Support the funnel above the filter for 3 to 5 minutes to allow the liquid to flow gradually into the flask at a rate approximately equal to the loss of solvent by volatilization. Repeat to make three extractions of the tissue. Evaporate the solvent by he

13、ating the flask on a steam bath, allow to cool and add 1.5 fuming sulfuric acid and 10 drops of fuming nitric acid. Heat gently on a digestion rack until the material gels as indicated by no further bubble formation at the bottom of the flask. The heating to expel the acid should be done carefully i

14、n a vented hood in such a manner that the material does not spatter. Ignite the flask and residue at 1000 C, to constant weight. Cool and re-weigh to the nearest 0.1 milligram. To confirm the residue as SiO2, transfer the major portion to a platinum crucible. Add 3 ml of concentrated hydrofluoric ac

15、id and 3 drops of concentrated sulfuric acid. Carefully expel the acids and ignite. There will be no significant residue if the ask was SiO2. Determine the percent moisture content of the paper in accordance with TAPPI Test Method T412. Then calculate the moisture free weight of the specimen as foll

16、ows: Wt. paper sample (moisture free) = Wt. paper sample (Wt. paper sample X percent moisture) Determine a blank value by analyzing a sample of untreated paper by the same procedure. Blank results are usually in the order of 2.5 mg SiO2. Subtract the blank from the weight of the SiO2 and calculate t

17、he siliconecontent of the paper as follows: Percent silicone content = (Weight silica ash blank) x 1.233 (SiH(CH3)3) x 100 Weight paper sample (moisture free) 3. REGULATORY REQUIREMENTS The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance w

18、ith paragraph 23.403 of the Federal Acquisition Regulation. 4. PRODUCT CONFORMANCE The products provided shall meet the salient characteristics of this Commercial Item Description, conform to the producers own drawings, specifications, standards, and quality assurance practices, and be the same prod

19、uct offered for sale in the commercial marketplace. The government reserves the right to require proof of such conformance. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50177B 5. PACKAGING Preservation, packaging, and marking shall be as spe

20、cified in the contract or order. 6. NOTES 6.1 Intended use. Type I lens paper is used for wrapping and cleaning lenses and other glass and highly polished surfaces. Classes 1, 2, and 3 are for dry cleaning applications; classes 4 and 5, for wet cleaning. Type II lens paper is used for wrapping or co

21、vering all coated optics. 6.2 Ordering data. a. Title, number and date of this document. b. Type(s), class(es) and size(s) required (see 1.1 and 1.2) c. Applicable National Stock Number(s) (NSNs) d. Specific preservation, packing and marking requirements 6.3 Sources for non-governmental association

22、documents. TAPPI Standards are available from Technical Association of the Pulp and Paper Industry, PO Box 105113, Atlanta, GA 30348. MILITARY INTERESTS: CIVIL AGENCY COORDINATING ACTIVITY: GSA -7FXE Custodians: Army MI Navy MS Air Force 99 PREPARING ACTIVITY: DLA-DM Army MI (Project Number: 6640-20

23、07-001) Review Activities: Army AR, AV, MD Navy AS, CG AF 03 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at http:/assist.daps.dla.mil. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-