Antioxidants st-21, 22, 23

Equivalent replacement of foreign counterpart：IRGASTAB® PUR 55//66/67

Characterization:

ST-21、22、23 is a revolutionary liquid heat stabilizer blend for polyether and polyester flexible foams. It is a BHT free blend containing aminic antioxidant.

Applications:

ST-21、22、23 is particularly suitable for the stabilization of polyols used for the manufacture of flexible foams.

ST-21、22、23 can also be added with additional antioxidants and/or costabilizers

(e.g, phosphites) and/or light stabilizers (e.g, HALS, UVA).

Features/ Benefits :

ST-21、22、23  exhibits good resistance to scorch, fogging, and textile staining. It particularly confers outstanding resistance to foam discoloration after gas and/or light exposure.

ST-21、22、23  is a pourable liquid allowing dust free handling, automatic dosage and

shortening of mixing time.It increases productivity by reducing weighing or metering to one single operation.

Product Forms :

Code:          Appearance:

ST-21、22、23   Light yellow liquid product

Guidelines for use :

In slabstock polyol applications, the concentration of ST-21、22、23  ranges between 4000 and 4500 ppm depending on the degree of stabilization desired.

Physical Properties:

Boiling Point                 > 200°C

Flash point                   not tested

Viscosity (40°C)              200 – 300 mm2/s

Relative density (20°C)         0.95 - 1.00 g/cm3

Vapor Pressure (20°C)          < 3 E-3 Pa

Water                       < 0.1