Document 3JmQLoOrVK8OZDRYe197NQMdn

Pn 64 Bestmll Gypsum Company FOB GRAHD RAPIDS DATB Septi 1, 1961 from *oli Lab officb ATTENTION OF Mr* J. B. Mbaa SUBJECT SPECIAL FIREPROOFIHO PLASTER ANSWERING YOUHS DICTATED BY C. G. Shuttleworth - tad 7M------------------------- The sample of special fireproofing plaster which you made according to tha formula In tha footnote of my latter of Aug* 3 to Mr* Swytnyk of Underwriters' Laboratories Inc* has been tested and found satis factory except for setting time, and It Is a little too fast* Ve understand that the U. L* Inspector will be at your plant next yeek to observe the running of the plaster and to place his stamp upon It tor use in vdH"TlM test'; * ` Would you please make 2 oharges of this material, according to the following formula, and package in plain bags if available; if not, run It into Lite Acoustical plaster bags* Run as auoh into eaoh bag as It will conveniently hold,being sure that eaoh bag contains the same amount of plaster within normal bag weight tolerances* $ Send us one bag by motor express, one gallon can by parcels pos4 speolal handling and approximately 750 lbs* to Mr. B. Swytnyk, f Underwriters1 Laboratories Ino*, Horthbrook,. Ill* Let us know when it goes forward* Charge all expense to R A D 222 - J. 0* Ho* 115* Forrmla: ^*20 cu. ft. perlite - to lbe/cu* ft* 262 lbs. Stucoo GR-52 76.5 lbs. Asbestos 703 27 lbs*, 5 os* Lumclte Cement - Universal Atlas or equal* 18 os* Ultrawet D.S* 17 os* Retarder SGP 0019049