Dimethyl phosphite or DMPi has main areas of application in the production of phosphonic acid derivatives, insecticides and plastic additive.

It is used in the manufacture of phosphonates, crop protection agents, flame retardants.

It is used as an intermediate to manufacture pesticides ; also used to produce organic corrosion inhibitors, dye Plastic Additive, plastic auxiliaries, lube oil Plastic Additive and adhesives.