OPTICAL BRIGHTENER ER CAS NO.13001-39-3

Packaging details: 25 kg /carton delivery detail: 15-20 days after receive the advanced payment product name optical brightening agent er-i / c.i.199 chemical name 1,4'-bis(2-cyanostyryl) benzene cas no. 13001-40-6,13001-39-3 c.i. No. 199 molecular formula c24h16n2 molecular weight 332 specification   appearance: greenish yellow crystalline powder melting point: 230-232°c purity: ≥99% maximum uv absorption spectrum: 365nm uses mainly be used in whitening of polyester fiber and as the raw material of paste form brightening agent in textile dyeing. Equivelent to blankophor er. Properties it has high whitening brightening effect and excellent fastness to sublimation.     specification:   test items units specification result appearance   light yellow powder confirm active matter wt % 99min 99.58 ash wt % 0.6max 0.16 moisture wt % 1max 0.18 melting point   189.4℃~191.5℃ 190℃±2℃     application: mainly used for whitening polyester, its blends fabric and acetate fiber.