Polychloroprene Rubber SN239 CAS NO.95-31-8

[Polychloroprene Rubber SN239] 
Polychloroprene Rubber SN239 is a general purpose, mercaptan modified polychloroprene rubber prkduced using a Nairit recipe and process technology. SN239 has a medium crystallization rate and can be seen as an equivalent to the WHV grade from DuPont 

A. Properties and Charaeteristics 
Polychloroprene Rubber SN239 has highest Mooney viscosity in the SN23x series and has similar characteristics to SN238. An outstanding characteristic of compounds from this grade are their excellent tear strength. The vulcanizates maintain very good properties even when highly filled or plasticized. SN239 has a medium crystallizaton rate and good solubility so that it can be used to adjust the viscosity of adhesive formulations and improve their heat resistance. SN239 compounds exhibit the good oil resistance, chemical resistance, ozone and aging resistance as well as the sunlight resistance, typical of polychlorolrene. Also typical are their good fire resistance and electrical properties. 

B. Specifications 
A Ccording to standard Q/SNYF02.09-2009. 
A Correlation of SN239 with Major Competitive Grades 
Shanna DuPont DENKA Lanxess 
SN239 WHV M130H 243 
1. Appearance: White or grey chips. NO solid impurities except talcum. 
2. TypieaI Polymer ProPerties 
Mooney visco sity ML(1+4)100° C: 110-130 
Mooney scorch MSt5(min): ≥ 12 
Module at 500% elongation(MPa): 2-5 
Tensile strength(MPa): ≥ 13 
Ultimate elongation(%): ≥ 800 
Brookfield viscosity(25° C, 5% toluene solution): 90-100 
Volatiles (wt. %): ≤ 0.8 
Ash (wt. %): ≤ 1.0