In recent years due to the rapid development of the LED industry, the demand for LED encapsulation materials has increased, among which LED silicone encapsulation adhesive has become the leader in LED encapsulation materials due to its excellent physicochemical properties. Accompanied by the aggravation of the energy crisis, the LED industry will maintain sustained growth, therefore, the market potential of LED packaging materials is huge. High-power LED encapsulation materials require their raw materials to have high transmittance and refractive index, and phenyl silicone oil has become an important part of the raw materials of LED encapsulation adhesive. With the increase of phenyl molar fraction, silicone materials, high temperature resistance, irradiation resistance and refractive index have been improved, LED encapsulation adhesive with phenyl silicone oil of increasing importance. 
Phenyl silicone oil for LED encapsulation mainly includes vinyl terminated methyl phenyl silicone oil and phenyl silicone oil containing hydrogen. Phenyl silicone oil according to the phenyl content can be divided into: low phenyl silicone oil (phenyl mole fraction 5% - 10%); in the phenyl silicone oil (phenyl mole fraction 25%); high phenyl silicone oil (phenyl mole fraction 45%). Different uses of LED encapsulant for different requirements for the phenyl content, high-power LED encapsulant generally require higher phenyl content, in order to achieve a high refractive index, thereby reducing the loss of light source energy.
Vinyl capped methyl phenyl silicone oil refers to the end group containing vinyl, the main chain of silicon atoms connected with methyl and phenyl silicone oil. According to the type of phenyl, it can be divided into methyl phenyl link type, diphenyl link type, and mixed type (containing both phenyl links).
Phenyl hydrogenated silicone oils are classified as hydrogen-sealed silicone oils.) Phenyl hydrogen-containing silicone oils are divided into hydrogen-sealed phenyl silicone oils and side-containing hydrogen-containing phenyl silicone oils, which are used for different purposes. The former is mainly used as diluent or chain extender when added to encapsulating adhesive, while the latter is mainly used as centralized cross-linking agent of encapsulating adhesive, playing the role of cross-linking center. Phenyl hydrogen silicone oil preparation method using cationic polymerization method, generally using sulfuric acid. In order to reduce the process, can also be used to catalyze the polymerization of acidic resin, eliminating the need to neutralize the catalyst step, directly filtered out of the acidic resin, and acidic resin can be reused many times. 
Vinyl capped methyl phenyl silicone oil and phenyl hydrogenated silicone oil is the basic raw material for high refractive index LED encapsulation adhesive, with the rapid development of the LED industry, LED encapsulation industry has unlimited potential, and there is a huge demand for phenyl silicone oil. In recent years, with the further improvement of domestic phenyl monomer, intermediate production technology, the research of such products has made some progress, but compared with foreign products there is still a certain gap, and need to be improved, at present, high refractive index LED encapsulation adhesive preparation technology and the market are monopolized by foreign silicone companies, phenyl material is the key to development, is the focus of urgent research.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150A. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.