Document 6RnJKnkJMnbw7aYDVvJkYKg5g

May 3, 1966 R. M. Spec. No. 13 Supersedes R. M. Spec. No. Dated January 14, 1966 13 GROUND LIMESTONE PLAINTIFF'S EXHIBIT DESCRIPTION USE White colored pulverized limestone. Ingredient in Joint System products. GP-1MS SOURCES Thompson & Weinman Co. Gantts Junction, Alabama OW 3910 Ground Limestone (Acme Plant) Purestone Limestone Co. Marble Falls, Texas (Acme Plant) Thompson & Weinman Co. New York, N. Y. (Akron Plant) SPECIF1CATIONS- Color - White - Equal to standard. #9 - #11 Fineness - Maximum Minimum Averagt Thru 50 " 100 " 200 " 325 mesh " " " 100% 100% 100% 95% 100% 100.0% 95.0% 85.0% 100% 100.0% 98.5% 90.0% Method of Testing: 50 gram sample washed thru 325 mesh screen until wash water is clear. Residue on screen dried and when dry, screened on Ro-tap for 15 minutes using 50, 100, 200, and 325 mesh screens. Water Carrying: Maximum Minimum Average Water to T.C. 35 cc 28 cc 32 cc / Alkalinity: Weigh out 20 grams of pigment in a clean 600 ml beaker. Add 400 mis of freshly distilled water to the beaker and rapidly stir with a small power stirrer for 10 minutes. Allow the slurry to stand for 20 minutes and determine the pH of the supernatant liquid using the pH meter. pH Specs. 9.0 Min. 9.5 Max. Sampling: Each plant shall take a representative sample of each shipment and test it for color, fineness, water carrying, and alkalinity. If the shipment does not meet the spec ifications, a laboratory batch of Joint System Cement shall be made and tested. If this cement is off-standard and complaints may be anticipated, the limestone shall not be used. A sample of the limestone shall then be sent to the General Laboratory with full particulars. DAM:se -/ Denotes change in this re-issue. SGP 0015928