4.4 DINITRO STILBENE 2,2 DISULFONIC ACID ( DNSDA) STANDARD has 430.37 molecular weight. Its melting point is 266 degree C. Density of this chemical is 1.6705 and its refractive index is 1.7000. This chemical needs to be stored in sealed form at 2 degree C to 8 degree C temperature range. 4.4 DINITRO STILBENE 2,2 DISULFONIC ACID ( DNSDA) STANDARD has been formulated under controlled temperature. Its quality has been checked on the basis of its shelf life, composition and processing method.