Reaction product of organosilane Si 264™ (3-Thiocyanato-propyltriethoxysilane) and ULTRASIL® VN 2 (specific surface area 130 m2/g). The production consists of one hundred parts of ULTRASIL® VN 2 modified with eleven parts of Si 264™. Since the reaction between the organosilane and the silica is complete, COUPSIL® VP 6411 offers the advantage of a homogeneous modification with low moisture adsorption during storage and significantly lower development of ethanol during mixing and processing.
Advantages:
- Particularly rapid vulcanization accompanied by great scorch safety.
- Creates a high share of short sulfur crosslinks which leads to low compression sets and high heat stability.
- High cure rate of Si 264™ which furthermore permits nitrosamine-forming thiuram accelerators to be eliminated, partially or even completely, and replaced by other accelerators which are not affected by the nitrosamine formation.
- Leads to better vulcanization properties than the Si 69® containing COUPSIL® grades in polar polymers such as NBR.
Typical Applications
Benefits at a glance
It is used in many fields of the rubber industry in combination with white fillers and where optimum technical properties are required.
COUPSIL® grades form a group of silane-modified silica products used as reinforcing fillers in rubber compounds with a wide range of polymers such as NR, IR, SBR, BR, (Hal)-IIR, NBR, EPDM, EPM and blends thereof. The use of COUPSIL® products is particularly advantageous in short mixing series. COUPSIL® grades therefore effectively meet the requirements of the rubber-processing industry, particularly for mechanical rubber goods, which demand products that can be easily processed.
Great advantages of the COUPSIL® family:
- Pre-reacted products which eliminate the equipment-related complex in-situ modification of silica in the mixer.
- Reaction in presence of accelerators by forming rubber-to-filler bonds during vulcanization.
- Enabling tear and abrasion resistance on an elevated level = as well as excellent dynamic properties
Product Details & Documents
Further Information
Storage:
Forms of supply:
12,5 kg paper bags – 375 kg wooden pallet