Document RJypjyRo2xnQMvYNrK3kjL3av

* .'*>' . 'W / MMvf^WM. 2 EAST END AVENUE* NEWLYORK 21- TM`Chemical Electrical Electronic* Envlronmen -- Mechanical* Physical 5y: .V - jtefc'vjwv SGP 0018745 Report Data Authi Hate Tes net: betv f iv< .?iS4aSl942_J>M beeif employee owned.'A'-X'vvUS^ ' *" ` `" - rr^T J.'f '/ > 't ' . -7 "^ / ~ '1' - - "'J&i- 1 SGP 0018746 Electrical Testing Laboratories, Inc. J EAST END AVENUE AT 7?*h STREET, NEW YORK 21, N. Y. Report No. 367657 Order No. 43753-L Oate December 27, 1957- RENDERED TO BESTWALL GYPSUM COMPANY TOTAL REFLECTANCE IN THE VISIBLE REGION OF FOUR PLASTER SAMPLES Data Requested Total reflectance in the visible region of four plaster samples. Authorization Purchase Order ITo. G-5346. Haterial Submitted Four 12 x 12-inch plaster samples identified as follows: ;tl Mo. Identification 6879 6880 6881 6832 No .1 Natural Trowel Finish No. 2 Natural Machine Texture No. 3 Super-White JT Trowel Finish No. 4 Super-White 4T Trowel Finish Tests The "total reflectance of the samples was measured utilizing the method described in IE3. Transactions 33, P. 373, 1938. The sample was measured at five locations; the center and midpoint between each corner and.the center of the sample. The average of the five readings was then computed. -M NOTt TM'I *0T IS fMI Re*tTY or TH| CUtMT ITS SIONiriCANCl IS SUSJSCT TO THS AOSOUACY AND SSSSSSS*YATV * CNASACT** OR T H * Ml t0 TO TMI COMMIHlNUVimiS or TMK T||T| MMORWIB. OUOTATiONS TSOM OR CITATIONS Or THIS ASSORT ASS AUTMORlISO ONLY SUSJCCT TO t T L RSVIKW AMO AAFAOVAU SGP 0018747 Report No. 367657 2 Results of Tests The results of the tests are shown in the following table. The results are the average of five readings. RTL No. 6879 6330 6831 6382 Per cent Average Reflectance 68.9 - 'V.* -, f < . 66.2 74.5 76.4 :T ~/T -r-r.-Li. /T/avs,. t Report Approved by Manager, Photometric Laboratory Checked by.& Copied by: nf In Charge of Tests. SGP 0018748