1、P-E1891 INTERIM AMENDMENT-1 June 31 1977 INTERIM AMENDMENT TO FEDERAL SPECIFICATION CLEANING COMFOLJND, PORCELAIN ANI) CERAMIC TILE This interim amendmeit was developed by the General Services Administration, Federal Supply Service, Washington, DC 20406, based upon currently available technical info
2、pation. procurement and forward reccmmendations for changes to the preparing activity at the address shown above. The General Services Administration has authorized the use of this interim amendment as a valid exception to Federal Specification P-C-1891, dated September 27, 1976. It is recommended t
3、hat Federal agencies use it in PAGE 2 Paragraph 3.1.1, line 3, add “The use of fluorocarbons in the aerosol propellant gas is prohibited. The propellant shall be analyzed for fluorocarbons as specified in 4.4.2.4. PAGE 7 Add the following: 4.4.2.4 Analysis of propellant gas for fluorocarbons and vin
4、yl chloride. 4.4.2.4.1 SDecial apparatus and materials. The chemical analysis procedure described herein requires the following apparatus and materials: (a) A can-piercing, pressure-measuring device recommended in the CSMA Aerosol Guide for detemining the internal pressure of aerosol products. frm B
5、uilders Sheet Metal Works, Inc., 110 Wooster Street, New York, NY 10012. The device is available as Model CBA-6 i b) A temperature programable gas chromatograph (HewletGPackard Model 5750, or equiva- Two stainless steel gas chromatography columns, 6 feet long by 1/8“ outside diameter, Standard prope
6、llant gases in lecture bottles from Matheson Gas Products (or another lent) equipped with a 0.5 ml gas sampling valve and thermal conductivity detector. (cl packed with 60-200 mesh silica gel. supplier.) : vinyl chloride, fluorocarbons no. 11, 12, 114, 115. (d) (e) Matheson lecture bottle control va
7、lve Model 58, or equivalent. 4.4.2.4.2 Gas chromatonraohic an- . Condition the chromatographic columns at 2OO0C with normal helium as the carrier gas at 75-100 mlhinute for one hour. aerosol container. gas chromatograph, and on mixtures of the aerosol propellant with each of the five standard propel
8、lant gases. the standard propellants with the aerosol propellant sample, use a llT1l connection (Swagelock, or equiv- lent). analyzed, each run is made to purge the valve or any other gases. detector. tion hold at 100 C and a 5 minute upper limit hold at 200 C. rate of 75-100 ml per minute. having t
9、he same retention time as any of the five standard propellant gases. Remove the actuator and cap of an unused Puncture the can using the pressure-measuring device and connect the device to the Triplicate chromatographic analyses shall be done on the aerosol propellant sample For mixing The lfT1l con
10、nection shall be removed entirely when the aerosol propellant sample alone is to be Bubble each gas sauiple through the sampling valve at a moderate rate for two minutes before The tgmperature program shall be 100C to 2OO0g at 6 C per minute with a 2 minute post injec- Helium is used as the carrier gas at the Analyzgthe samples using a thermal conductivity There shall be no detectable material in the aerosol propellant sample FSC 7930 WA DC 77.64SI / THIS DOCUMENT CONTAINS ,) PAGES. - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
