Chloroprene rubber SN122 is a general purpose, sulfur modified polychloroprene rubberproduced using a Nairit recipe arid process technology. SN122 has amedium to low crystallization rate and can be seen as an equivalent to the GNA grade from DuPont.
A. Properties and Characteristics
Compared with SN121, SN 122 has a slightly higher Mooney viscosity SN122 breaks down well under mechanical shear to produce smooth compounds with little stickiness. It shows good compafibility with other grades of CR. Compared with CR122, SN122 has improved processability, can be more easily milled to reduce its molecular weight, for mixing with other rubbers or for compounding; it also better for extrusion processing. The surface of compounds from SN122 are smooth and die swell tends to be smaller than for CR122, Cured with metal oxides the compounds cure rapidly but have a reasonable scorch safety. SN122 compounds exhibit the good oil resistance, chemical resistance, ozone and aging resistance as well as the sunlight resistance, typical of polychloroprene. Also typical are their good fire resistance andl electrical properties.
B. Specifications
According to standard Q/SNYF02.01-2009
A Correlation of SN122 with Major Competitive Grades
Shanna DuPont DENKA Lanxess
SN122 GNA PM-40 710
1, Appearance: Light yeilow or amber chips. No solid impurities except talcum. No scorched particles. 2. Typical Polymef Properties
Mooney viscosity ML (1+4) 100º C---51~65
Mooney scorch MSts (min). ≥25
Module at 500% elongation (MPa) 2~5
Tensile strength (MPa) ≥23
Ultimate elongation (%) ≥850
Volatile (wt.%)
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