Structural composition
Fully hydrogenated polysilazane: It belongs to inorganic polysilazane and is a special type of polysilazane. The molecule only contains three elements: silicon, nitrogen, and hydrogen, and the side chains are all hydrogen.
Polysilazane: including inorganic and organic polysilazanes. The side chains of organic polysilazanes carry organic groups.
Performance characteristics
Fully hydrogenated polysilazane: It has a relatively simpler structure, making the conversion process easier to control when converted into ceramics or coatings. It can be converted through various methods at lower temperatures and has good adhesion to the substrate. The converted coating has characteristics such as corrosion resistance, high and low temperature resistance, gas isolation, long-term durability, transparency, and scratch resistance.
Polysilazane: Performance varies greatly depending on specific types and structures. Overall, it has a certain degree of high temperature resistance and can be thermally decomposed into ceramic materials such as SiCNO, SiCN, or SiO ₂. However, organic polysilazane may not have the same high temperature resistance as fully hydrogenated polysilazane due to the presence of organic groups, but may have some special organic properties such as flexibility.
synthetic method 
Fully hydrogenated polysilazane: It can usually be prepared by reacting silane and ammonia under specific conditions, such as using ammonolysis.
Polysilazane: There are more diverse synthesis methods, including ammonolysis, hydrazine hydrolysis, amine hydrolysis, ring opening polymerization, dehydrogenation coupling, etc.
application area 
Fully hydrogenated polysilazane: mainly used for making ceramic precursors and thermal insulation materials, it can be used as a dielectric layer, barrier layer, optical film in the field of optoelectronics, and can also be used as a coating for solar cells.
Polysilazane: Widely used in various fields, in addition to being used as a ceramic precursor for the preparation of ceramic fibers, ceramic coatings, porous ceramic materials, etc., it can also be used in resin materials, adhesives, microelectromechanical systems (MEMS) and other fields.
stability
Fully hydrogenated polysilazane: relatively stable without other interfering factors, but also has certain reactivity towards water, oxygen, etc. However, compared to some organic polysilazanes, their stability may be better in certain harsh environments.
Polysilazane: There are significant differences in stability, and organic polysilazane may be more prone to reactions in some environments due to the presence of organic groups, resulting in relatively poor stability; Some inorganic polysilazanes (such as fully hydrogenated polysilazanes) have relatively better stability, but overall they have high reactivity towards water, polar compounds, oxygen, etc., making storage and transportation difficult.

For more product details, pls check Inorganic Polysilazane IOTA-PHPS