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- Updated 19 June 2011 Dowla Brothers & Company Bangladesh Dear Sirs,Please quote your best price forPHTHALIC ANHYDRIDE (P.A.): H.S.Code No. 2917.35 having following specification: Appearance: white Flakes, Assay:99.85% min (method BS 3773-1964), Color Index Max 20 (method: ASTM D3366-85),Hazen after 90 min at 250 C: max 30 (methodSTM D3366-90), Phthaide ... Phone 880 - 2 - 8912085 Address House#11, Road#33, Sector# 6, Uttara ...