Document x5narna1gvGYooYMabwkBBmbg

E. I. DU PONT DE NEMOURS & COMPANY KREBS PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK, NEW JERSEY Copy No. / l jliRAJRV COP^j Period Covered: NEWARK PLANT PIGMENT COLOR RESEARCH REPORT Find Repost *Wlute Chromate* X-49V-R 3m&, 1943 - August, 1943. FILE: DATE: 210*7 5-36-^. NJB638 N39985 Serial po# o-44-30 Copy Bo. l Copy to* #1 - numerical Bile ^ 2 - Research Office (210*7) 3 Library File 4 - #10 Building File 5 ** # 6 * 6 - Imperial Chemical Industries. Ltd. 7- a g- ao 9 - Mr. C, H. Rupprecht, Wilmington (ICI File) B1WARK PLA8T PIQliEMT COLOR RESEARCH REPORT Final Report Title* Barium Chromate, 1-497-0 Period Covered* June, 1943 - August, 1943* EMITTED MI J. R. Borst G /{?. vAPPROVED BI* 7, Chalupaki ft fay BATE SUBMITTED: 4/26/44 BATE ISSUED* 5-26-44 N39985.01 DUP050150308 IIMSM Th previous development work on barium chromate served merely to provide Philadelphia with material for testing purposes. The most recent work was undertaken in conjunction with the Chemical Warfare Service# fhe purpose of this study was to determine costs and to produce material to seat C.W.S. specifications, w p tm mowffiffffiffl# Only three batches of T-197-D were made in the semi works in the present study. The first two batches were made on the old K-9163 formula which was set up In 193#. Material made os this formula contained S per cent HC1 insoluble material (presumably BaSOi) which prevented Its meeting the 99 per cent BaCrOA specification, m addition, this formula erroneously called for a large^ehrome excess, A sew formula (*1927) was written to more closely balance the precipitanta but no batches were struck on lt Instead, the present T-A97-0 standard (-1930) was formulated is an endeavor to minimise the mount of sulfate present in the color. This formula uses bichromate liquor neutralised with oaustie soda instead of chromate liquor, since the latter say contain up to 2,5 per cent sodium sulfate, while the specification for the former material is 0*5 per cent sodium sulfate maximum. The only semi works batch struck on this formula had the following analysis* 98.87# Ba as BaCr04 99.62# Cr as BaOrO^ .037# Cl .0# % H20 Mo further work on this code was carried out subsequent to this batch made on the -1930 formula* im - M-1 'V: DUP050150309