Optical Brightener ER-1, CAS 13001-39-3
Optical Brightener ER-1 is a stilbene-based fluorescent whitening agent with the chemical name 1,4-Bis(2-cyanostyryl)benzene. It is also known as Fluorescent Brightener 199, Fluorescent Brightener ER, Fluorescent Brightener ER-I, Optical Brightener ER and FBA 199. ECHA identifies CAS 13001-39-3 as 2,2'-(p-phenylenediethene-2,1-diyl)bisbenzonitrile, while commercial references use 1,4-Bis(2-cyanostyryl)benzene as a common product name.
Optical Brightener ER-1 has the molecular formula C24H16N2 and a molecular weight of 332.4 g/mol. Melting point of approximately 230–232°C.
Chemical Name: 1,4-Bis(2-cyanostyryl)benzene
Product Name: Optical Brightener ER-1
CAS No.: 13001-39-3
Synonyms: Fluorescent Brightener 199, Fluorescent Brightener ER, Fluorescent Brightener ER-I, Optical Brightener ER, Optical Brightener ER-1, FBA 199, B-ER, Cyanostyryl benzene, 2,2'-(1,4-Phenylenedi-2,1-ethenediyl)bisbenzonitrile
EC No.: 235-835-1
Molecular Formula: C24H16N2
Molecular Weight: 332.4 g/mol
IUPAC Name: 2-[(E)-2-[4-[(E)-2-(2-cyanophenyl)ethenyl]phenyl]ethenyl]benzonitrile
Chemical Type: Stilbene Fluorescent Brightener
Main Function: Optical Brightener / Fluorescent Whitening Agent

Appearance: Yellowish-green powder
Purity: ≥98.5
Fineness: ≥200 mesh
Volatile matter: ≤0.5%
Ash content: ≤0.5%

Suitable for the whitening and brightening of polyester synthetic fibers, acetate fibers, and PVC plastics.
25kg/carton.
6500MT/year.
Store Optical Brightener ER-1 in tightly sealed original containers in a cool, dry and well-ventilated area.
Protect the product from moisture, excessive heat and direct sunlight.
Hosea Chem® supplies Optical Brightener ER-1, CAS 13001-39-3, also known as Fluorescent Brightener 199, Fluorescent Brightener ER-I and 1,4-Bis(2-cyanostyryl)benzene, for plastics, PVC, synthetic fibers, coatings and other polymer applications.