Chloroprene rubber SN321 is a general purpose, it is obtained by Chloroprene monomer by emulsion polymerization with low rate of crystallization, It is adopted the world advanced technology and processes in regulating the molecular weight, it can be seen as an equivalent to Dupont GW(M2) of the United States.
A.Properties and Characteristics
SN321, which has good properties of physical mechanics and plastication. Under mechanical shear, Breakdown of SN321 molecular cliain is weaker than SN112-series, is stronger than SN12-series in the thermal stability. It has better compatibility in combination with other types. It exhibits good resistant to oil, chemical reagents ,ozone aging, sunlight , extension of the fine is not flammable and better electrical, as well as processing of security and stability. Compared with CR322, Mooney viscosity of SN321 is uniform and stable, better processability, more mastication, mixing and extrusion , the surface of sheet is flat and smooth and smaller shrinkage ,the products appearance is good . It has the same processability as Dupont GW of the United States.
B, Specifications
According to standard Q/SNYF02,14-2009
A Correlation of SN321 with Major Competitive Grades
| Shanna | DuPont | DENKA | Lanxess |
| SN321 | GW | DCR-40 | 510 |
1.Appearance: Light yellow or amber chips, with talcum as a release agent, no mechanical impurities, no scorch particles.
2.Typical Polymer Properties
Mooney viscosity ML(1 +4) 100º C............................................................................37~49
Mooney scorch MSt5( min).........................................................................................≥25
Module at 500% elongation ( MPa) ..........................................................................2.0~5.0
Tensile strength ( MPa ) .............................................................................................≥22.0
Ultimate elongation ( % ) ...........................................................................................≥800
Mass fraction of volatiles(wt.%).................................................................................≤1.3
Mass fraction of ash(wt.%) ........................................................................................≤1.0