In scenarios where high-temperature powder coatings, aerospace equipment, and military protective coatings need to withstand thermal cycling stress and mechanical bending, the coatings must not only meet the temperature resistance requirement of ≥350℃×4h with a weight loss of ≤5%, but also possess excellent bending resistance to prevent cracking or detachment. Traditional high-temperature-resistant pure silicone resins are often hard and brittle, and are prone to cracking under flexible substrates or thermal expansion mismatch conditions. The environmentally friendly solid resin 6106 maintains the temperature resistance performance of 6105 while enhancing the resin's flexibility by increasing the benzene content, reducing the softening point to 70±5℃, and can meet the requirements for high-temperature resistant products that need bending resistance.


Why do high-temperature powder coatings often crack or have insufficient flexibility in thermal cycling or bending conditions?


The benzene content of the resin is insufficient to provide sufficient molecular chain flexibility, resulting in cracks in bending or thermal shock conditions.


The adjustment of the softening point (70±5℃) and gelation time (10-60 minutes at 200℃) needs to adapt to specific substrates and curing processes.


The mixing ratio with 6103, 6105, or other resins has not been optimized, affecting the balance between flexibility and temperature resistance.


The compatibility of fillers, pigments, and additives affects the bending resistance and high-temperature stability of the coating.


The thermal expansion coefficient of the substrate does not match the coating, causing internal stress during thermal cycling and resulting in cracking.


Comparison of key differences between 6106 and 6105, 6103


Comparison item 6106 6105 6103
Temperature resistance performance ≥350℃×4h weight loss ≤5% ≥350℃×4h weight loss ≤5% 350℃×2h weight loss ≤5%
Softening point 70±5℃ 85±5℃ 85±5℃
Benzene content High, enhancing flexibility Medium High methyl content, hard and brittle
Core characteristics Good flexibility, suitable for bending resistance High glass transition temperature, better heat resistance Highly brittle, good gloss
Gelation time (200℃) 10-60 minutes (customizable) 10-60 minutes (customizable) 5-15 minutes (customizable)
Application schemes Can be mixed with 6103, 6105 Only with 6103 Only with 6105
Which conditions need to be confirmed before selection and processing?


Condition category Required information
Mechanical performance requirements Whether it involves bending, thermal cycling, flexible substrates or thermal expansion mismatch conditions
Substrate type Metal (aluminum, steel, etc.), composite materials or others
Processing method Electrostatic spraying, transfer molding, solvent-based coating, etc.
Compatibility system Whether it can be mixed with 6103, 6105, epoxy or polyester and the mixing ratio
Curing process Matching of softening point and gelation time
Storage conditions Environmental temperature (recommended below 30℃), moisture-proof sealing measures
Performance goals Temperature resistance grade, flexibility, insulation performance, adhesion synergy
Which key indicators should be verified?


Verification items Primary function Not replaceable content
Flexibility/bending resistance test Verify the resin's anti-cracking performance in bending conditions Only a rigid test piece cannot represent the flexible application scenario
Adhesion (before and after high temperature) Evaluate interface bonding stability Adhesion qualified does not mean flexibility qualified
Thermal cycling test Simulate actual temperature fluctuation conditions Static heat resistance cannot replace thermal cycling verification
Common misunderstandings


Flexibility improvement necessarily sacrifices temperature resistance
6106 enhances flexibility by increasing benzene content instead of reducing crosslinking density, improving bending resistance while maintaining ≥350℃×4h weight loss ≤5%.


Storage requirements for powder resins can be relaxed
The softening point is low (70±5℃), and it needs to be stored below 30℃ in summer or high-temperature environments to prevent caking.


In any application scenario, the resin with the lowest softening point should be chosen as the priority.
A lower softening point is beneficial for reducing the film-forming temperature, but it is necessary to select the matching softening point and gelation time according to the specific process (such as electrostatic spraying, transfer molding, etc.).
Recommended steps:


Confirm whether the application involves bending, thermal cycling, or requirements for flexible substrates.


Evaluate whether it is necessary to mix with 6103 (for enhanced hardness) or 6105 (for improved heat resistance).


Determine the appropriate softening point and gelation time based on the processing method (electrostatic spraying, transfer molding, etc.).


Conduct small sample verification, focusing on testing flexibility, adhesion, thermal resistance, and thermal cycling performance.


Optimize the formulation and curing process based on the verification results.


FAQ


What is the main difference between 6106 and 6105?
6106 maintains the same temperature resistance level (≥350℃ × 4 hours of weight loss ≤ 5%) as 6105, but increases the content of phenyl, enhances the flexibility of the resin, and the softening point is reduced to 70 ± 5℃. It is suitable for high-temperature resistant products that require resistance to bending.


What is the softening point of this product?
The softening point is 70 ± 5℃, which is lower than 6105 and 6103 (both are 85 ± 5℃), and it can adapt to different processing requirements.


Can 6106 be mixed with 6103 or 6105?
OK. This product can be used in combination with 6103 and 6105. By adjusting the mixing ratio, different performance products can be obtained, meeting diverse application requirements.
What are the typical application scenarios?
It can be used as a high-temperature resistant powder coating or liquid resin, especially suitable for high-temperature resistant products that need to be resistant to bending, such as barbecue grills, mufflers, exhaust pipes, aerospace equipment, military equipment, etc.