Molecular Formula: Na2SO3CAS No: 7681-57-4HS Code: 28321000Main Uses:1) Industrial Grade: Dyeing mordant, dechlorinating agent for washed fabric, medical deoxidizer and sulfonating agent, bone black for bamboo, wood and paper fiber, non-ferrous mineral separation agent, waste water disposing agent,

1. Distinguish from packagingGenerally, there are different technical standards for the three kinds of respirators, namely, disposable medical respirator (YY / t0969-2013), medical surgical mask (yy0469-2011) and medical protective mask (gb19038-2010). You can judge which type of mask the product be

Optical BrightenersOptical brighteners are used to mask the inherent yellowness of plastics and are used to improve colors and make plastic look whiter and brighter. These are generally added to enhance the esthetics . Optical brighteners are often used in conjunction with other colorants to achieve

1. Distinguish from packagingGenerally, there are different technical standards for the three kinds of respirators, namely, disposable medical respirator (YY / t0969-2013), medical surgical mask (yy0469-2011) and medical protective mask (gb19038-2010). You can judge which type of mask the product be