Polychloroprene Rubber SN238 CAS NO.9010-98-4

Polychloroprene Rubber SN238
Polychloroprene Rubber SN238 is a general purpose, mercaptan modified polychloroprene rubber produced using a Nairit recipe and process technology, SN238 has a medium crystallization rate and can be seen as an equivalent to the WHV-100 grade from Dupont. 

A. Properties and Characteristics 
Apart from its higher Mooney viscosity,Polychloroprene Rubber SN238 has similar characteristics to those of SN231 and SN232. 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. SN238 has amedium crystallization rate and good solubility so that it can be used to adjust the viscosity of adhesive formulations and improve their heat resistance. SN238 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 Coreding to standard Q/SNYFO2.08_2009. 
A Correlation of SN238 With Major Competitive Grades 
Shanna DuPont DENKA Lanxess 
Polychloroprene Rubber SN238 WHV-100 M130L 230 
1. Appearance: White or grey chips. NO solid impurities except talcum. 
2. TypieaI Polymer ProPerties 
Mooney viscosity ML(1+4)100° C: 90-110 
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): 65-95 
Volatiles (wt. %): ≤ 0.8 
Ash (wt. %): ≤ 1.0