Formalin
Formaldehyde is an organic compound with the formula CH2O. It is the simplest form of aldehyde, hence its systematic name methanal.
A gas at room temperature, formaldehyde is colorless and has a characteristic pungent, irritating odor. It is an important precursor to many other chemical compounds, especially for polymers. In 2005, annual world production of formaldehyde was estimated to be 23 million tonnes (50 billion pounds). Commercial solutions of formaldehyde in water, commonly called formalin, were formerly used as disinfectants and for preservation of biological specimens.
Uses
In photography, formaldehyde is used in low concentrations for process C-41 (color negative film) stabilizer in the final wash step, as well as in the process E-6 pre-bleach step, to obviate the need for it in the final wash.
Formaldehyde is used extensively in the woodworking and cabinet-making industries. Urea-formaldehyde is used in the glues that bond particle board together. The particle board is used underneath wood veneer and plastic laminate. Cabinets, bank counters, and veneered and laminated woodwork all use particle board containing urea-formaldehyde under the plastic laminate and wood veneer
Specification:.
Appearance Clearly liquid ,allow a white suspension at low temperature
Qualified Content %37.0-37.4%
Acid Value (In formic acid) %≤0.02
Density,ρ(20g/cm³) 1.075-1.114
Fe content%≤  1ppm