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How to add the silicone oil to the silicone rubber?


silicone oil is any liquid polymerized siloxane with organic side chains. The most important member is polydimethylsiloxane. These polymers are of commercial interest because of their relatively high thermal stability and their lubricating properties.
And silicone oil seems the silicone rubber mate for many user of silicone rubber would add silicone oil to reduce the viscosity or the hardness of the rubber, especially those who make the printing pads by the liquid pad printing silicone rubber. 

Then, how to add the silicone oil to the silicone rubber? 
Generally speaking, the silicone rubber has two kinds, tin cure (condensation cure ) silicone and platinum cure (addition cure) silicone rubber. And the part B of both kinds are the hardner. 
Usually, the silicone oil would be added into the hardner. 
Stir the mixture of silicone oil and hardner evenly before adding the silicone rubber base. 

How many silicone oil to be added into the silicone rubber? 
If for our pad printing silicone rubber SE-635# in 32~34 shore A, then every 2% silicone oil (100g hardner, 2g silicone oil), would reduce 1 shore A. And if 25% silicone oil added into the hardner, the hardness would be about 15shore A. 
If for the common tin cure silicone rubber, every then every 2% silicone oil (100g hardner, 2g silicone oil), would reduce 1 shore A. 
If for the common platinum cure silicone rubber, every then every 0.5% silicone oil (100g hardner, 0.5g silicone oil), would reduce 1 shore A. 

Of course, the data above are theoretical.
Pls do take a small test before the produce. 

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