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When added on a 2-roll mill, 0.5 to 1% of BLUESIL ADD 904 has a very noticeable effect on the green strength of HCR mixtures. Whilst higher doses can be used (up to 2 %) without having a detrimental effect on the cured compounds’ mechanical properties, this may cause « mill shrinkage » to occur.
Comments: BLUESIL ADD 904 tends to increase the swell, especially on slightly charged mixtures. Furthermore, its use is not recommended in transparent mixtures.
The increase in Mooney Viscosity of MF 135 U and MF 175 U:
For example, the table below gives the change in Mooney Viscosity obtained for MF 135 U and MF 175 U as a function of the BLUESIL ADD 904 dose.


​BLUESIL ADD 904 dose (in parts)




​MF 135 U




​MF 175 U




Conditions: ML (1 + 4) at 30 °C on uncatalysed product


STORAGE t < +40°C IN ITS ORIGINAL PACKMaterial is stable under normal conditions. Store in a cool, dry place with adequate ventilation. Keep away from incompatible materials, open flames, and high temperatures. Suitable containers: polyethylene.Please consult the Safety Data Sheet of this product.ELV;Food Contact;GADSL;Heavy Metals;RoHS;WEEE


White powder.


HCR Additives

ELV;Food Contact;GADSL;Heavy Metals;RoHS;WEEE

BLUESIL ADD 904 is an agent designed to increase the green strength and the viscosity of HCR mixtures to improve their processability. It has a permanent effect.

Asia Pacific;Europe Middle East Africa;Central and South America;North America

For information about Storage and Shelf Life for this product, please download the Technical Data Sheet.


























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