What is the ratio of the epoxy to the white carbon black? Either the epoxy doesn't change color, the epoxy is modified (that is, the unsaturated bond of the epoxy is added with H) , or time is added to prevent yellowing, our company has this reagent. Silica to add how much depends on the requirements of the product, more thixotropy will increase!
The more information of phenyl silicone oil, you can check:
https://www.iotasilica.com/ 
