Raw material factors
The type and quality of epoxy resin itself: Different types of epoxy resins, such as bisphenol A type, bisphenol F type, phenolic type, etc., have different chemical structures and corresponding performance characteristics. Bisphenol A-type epoxy resin is widely used, but there are certain limitations in terms of temperature resistance; Bisphenol F-type epoxy resin performs better in flexibility and corrosion resistance; Phenolic epoxy resin has higher heat resistance and chemical stability. Moreover, in the process of raw material production, if the quality control is poor and there are impurities, it will directly affect the performance of subsequent epoxy resin products, such as incomplete curing and poor mechanical properties due to insufficient purity.
Types and dosages of curing agents: There are various types of curing agents, such as amine curing agents (fatty amines, aromatic amines, etc.), anhydride curing agents, etc. Different curing agents will cause epoxy resins to exhibit different curing speeds, degrees, and properties of the cured products. For example, amine curing agents have a relatively fast curing speed, while anhydride curing agents often have better heat resistance and electrical insulation properties in their cured products. At the same time, the dosage of curing agent must be precisely controlled. Insufficient dosage can cause incomplete curing of epoxy resin, low mechanical properties such as hardness and strength, and poor chemical resistance; Excessive usage may lead to problems such as brittle solidification and increased internal stress.
Process factors
Curing temperature and time: The curing temperature has a significant impact on the curing reaction of epoxy resin. Generally speaking, increasing the curing temperature appropriately can accelerate the curing reaction rate and enable epoxy resin to reach a higher degree of curing faster. However, excessive temperature may cause defects such as resin decomposition and bubble formation, affecting its appearance and performance; If the temperature is too low, the curing reaction will be slow or even difficult to fully proceed. The curing time is equally critical. If the curing time is too short, the resin may not fully cure and its performance may not reach its optimal state. Conversely, if the curing time is too long, it may affect efficiency and increase costs in some industrial production scenarios.
Mixing degree: When epoxy resin is mixed with additives such as curing agents, thorough and uniform mixing is crucial. If the mixing is not uniform, there may be too much or too little local curing agent, resulting in inconsistent properties of various parts of the cured epoxy resin, such as high hardness in some areas and low hardness in some areas, unstable overall mechanical properties, and affecting its reliability in practical applications.
Additive factors
The use of diluents: Diluents can reduce the viscosity of epoxy resin, facilitate construction operations, and active diluents can participate in curing reactions, which can improve the flexibility and other properties of the resin to a certain extent; Non reactive diluents do not participate in the curing reaction, but can adjust viscosity for ease of application. However, if added in excessive amounts, it may reduce the strength, hardness, and chemical resistance of the cured epoxy resin.
Addition of fillers: Adding fillers can improve many properties of epoxy resin. Adding fiber fillers such as glass fiber and carbon fiber can significantly improve their mechanical properties, enhance tensile strength, bending strength, etc; Adding inorganic fillers such as silica and alumina can improve hardness, wear resistance, and thermal conductivity; Adding flame retardants can enhance the flame retardancy of epoxy resin. However, the type, particle size, and amount of filler need to be selected reasonably. If the particle size of the filler is too large, the distribution is uneven, or the amount of filler is unreasonable, it may lead to poor processing performance of the epoxy resin, resulting in problems such as agglomeration and stress concentration, which will affect the final performance.
environmental factor
Humidity: The curing process of epoxy resin is sensitive to environmental humidity. In high humidity environments, moisture is easily mixed into the resin system, which may react with curing agents and affect the normal progress of the curing reaction, resulting in incomplete curing; On the other hand, the residual moisture inside the epoxy resin after curing may reduce its electrical insulation performance, cause internal corrosion, and affect long-term stability.
Storage conditions: During the storage process of epoxy resin, if the ambient temperature is too high, it may accelerate the aging and deterioration of the resin itself; If exposed to direct sunlight, ultraviolet rays can also have adverse effects on the resin, causing changes in its properties. At the same time, if stored poorly and exposed to external factors such as air, it is also prone to moisture and contamination, which can affect the performance during subsequent use.

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