Rubber/EPDM rubber


QUESTION: Thick white smoke billowed has a pungent odor in the product

ANSWER: Dear Mr. Medhat,

Without know your formulation is very difficult to do na opinion, but I guess that your problem is related to bloomimg of accelerator.
Try to change part of the Thiuram or Ditiocarbamate, by MBTS and MBT and reduce the sulphur below 1 phr.



---------- FOLLOW-UP ----------

QUESTION: i use this formulation
EPDM - carbon - sulphur - MBT - ZDEC - stearic acid - zinc oxid

Dear Mr. Ahmet,

Please, try to used this cure system, it do not migrate on press curing and vapor.
I think that it could solve your problem.

Sulphur 2,0
TDEDC  0,8
MBT      1,5          
TMTD    0,8
DPTT     0,8

Best Regards



All Answers

Answers by Expert:

Ask Experts


Luis Antonio Tormento


Operational Chemical Engineer with specialization in rubber compounding and processing: - Vast knowledge on rubber molding techniques: extrusion, press and injection molding. - Marketing expertise on the development of applications of rubber chemicals, precipitated silica and specialty rubbers. - In his career he developed numerous production compounds for automotive and industrial hose, rubber mats, retread compounds, tire compounds, shoe soles and molded products. TPE/TPV/TPO applications


I have 36 years working in plant processing of hose, tire, shoes and press/injected cured rubber compounds and technical assistance for two big raw material suppliers: Chemtura and Nitriflex. Actually I have my own company

2006-2011 - Rubber Division Director - Brazil Rubber Group 2008-2009 - Vice President - Brazil Rubber Group 2002-2007 - President - Brazil Rubber Group 2000-2001 - Technical Director - Brazil Rubber Group

Several papers published on magazines, congress and conferences about rubber processing and compounding

Chemical Engineer by FEI - Brazil (1979) Advanced Rubber Technology - Rubber Division (1992) University Expert on Plastic and Rubber - UNED (Spain) - 2002

©2017 All rights reserved.