Document 82KRxapXdGknOJeXknQXV7Gby

CERTIFICATE OF APPROVAL SERIAL NO. EN2S/L5/2274 22 Mg 194.? IDENTIFICATION Material Insulation, Thermal, Block Governing Navy Department_Speeifications 32-1-3, Classes (a) and (b). Trade name (brand) CALSILITo. Manufacturer Ruberoid Company, Address 500 Fifth. Avenue, Nev York, K. Y. HISTORT OF TTPE OR BRAND APPROVAL TESTS Manufacturer's application for teats, letter 15' September 1942 4 uthoriaation of testa, Bu. letter No. 539( 2) (350) dated 25 Septeaber 1942 Axa conducted at ^Engineering Exoeriaent Station, Annapolis, Maryland Testa started 6 January 1243 Tests completed 5 August'1943 Test results covered by Laboratory Report No. E-S971 dated 5 August 1943 Reported to manufacturer under Bu. letter S3S-2(250) Of even date. ACTION Approved - Registered on Acceptable List of Approved Materials. REMARKS NAVY DESIGNATION The Navy designation assigned to this material is CAT.SVT.TTF CONDITIONS OF APPROVAL MICH01232 lass 01--0216492