Changfu Chemical EXDT Series: Epoxycyclohexylethyl Terminated PolyDimethylsiloxanes for Cycloaliphatic Epoxy Potting with Superior Low Stress, High Toughness and Thermal Cycle Resistance

In the fields of new energy electronics, high-voltage electrical equipment, and precision optics, cycloaliphatic epoxy potting/sealing systems have long faced challenges such as high curing internal stress, brittleness at low temperatures, and insufficient resistance to thermal shock. This is particularly true in high-end conditions with Relying on the mature application foundation of our classic product BEX12, and to address the application shortcomings in high-end conditions and enrich the product selection system, Changfu Chemical has newly launched the EXDT series of epoxycyclohexylethyl terminated polydimethylsiloxanes.

EXDT continues the BEX12 dual-end epoxy cyclohexane active end group, which is fully compatible with the original cycloaliphatic epoxy curing system and can be directly replaced. At the same time, by extending the flexible long chain of siloxane, we break thru the performance limits of the short chain structure, creating a high-end complementary and upgraded alternative product within the same system as BEX12, forming a complete selection matrix of "general standard version + high-end toughening version”

Basic Specifications:

Core Advantages：

• Upgraded Long-Chain Flexibility for High-End Toughening

Extended and well-ordered siloxane flexible segments deliver greater molecular chain mobility. This structure effectively buffers curing stress and lowers the modulus of adhesive layers, which remarkably boosts material toughness and overall crack resistance under harsh conditions.

• Excellent System Compatibility

Featuring identical terminal groups as BEX12, the product possesses high reactivity and perfect matching performance with existing curing systems. It causes no adverse phase separation, oil bleeding or surface fogging, and will not compromise the interfacial adhesion between materials.

• Low Stress & High Long-Term Reliability

Uniformly distributed flexible siloxane segments efficiently relieve internal stress generated during curing. The material achieves outstanding resistance to thermal shock, mechanical vibration and structural cracking, ensuring stable performance for long-term service in complex and demanding working environments.

• Comprehensive & Balanced Performance

While greatly improving flexibility and ductility, it fully inherits the superior properties of cycloaliphatic epoxy resin, including excellent electrical insulation, high thermal stability and outstanding weather resistance. No core functional performance is sacrificed.

Application Scenarios：

Fully compatible with the mature BEX12 formulation, EXDT requires no formula adjustment or pre-adaptation. It serves as an upgraded solution for rigorous working environments, forming a complete product portfolio for both general manufacturing and high-reliability industrial applications.

• Precision Electronic Potting & Encapsulation

This product is widely used for potting PCB modules, industrial sensors, power controllers and micro-electronic components. Its low internal stress and superior flexibility greatly improve resistance to cold temperatures and thermal cycling, effectively solving common defects like brittle fracture and functional failure. It also provides reliable protection against external contaminants and mechanical stress.

• New Energy Industry Packaging

Tailored for charging pile assemblies, vehicle ECU and power battery auxiliary units in the new energy sector. With remarkable resistance to broad temperature ranges and strong vibration, it maintains stable physical and chemical properties under harsh operating environments, greatly extending the service life of core devices.

• High-Voltage Electrical Insulation

Designed for current transformers, insulation parts and various high-voltage components. Combining superior electrical insulation, high temperature resistance and low-stress toughness, it avoids cracking risks during long-term service and guarantees the safety and stability of high-voltage electrical systems.

• High-Precision Optical & Instrument Sealing

Applied to sealing and edge bonding of precision optical devices and laboratory instruments. The flexible siloxane structure offsets stress generated by thermal expansion and contraction, stopping interface debonding and structural cracks, and maintaining the long-term accuracy of precision equipment.

Overall Selection Logic：

The BEX12 and EXDT series adopt distinct but complementary positioning, with no disparity in product quality. The selection depends entirely on your practical application scenarios and technical performance requirements.

• BEX12：It is engineered for general mass production. Featuring high cost-effectiveness and outstanding stability, it is the ideal choice for large-scale standardized manufacturing lines.
• EXDT-10/20：These grades deliver exceptional long-term reliability, ultra-low internal stress, superior resistance to thermal & cold cycling, as well as remarkable toughness. They are specially developed to cope with high-end applications and severe operating conditions.

Backed by this dual-product portfolio, Changfu Chemical delivers full-range alicyclic epoxy potting and modification solutions covering both general and high-end fields. We assist clients in achieving precise formula matching, optimizing product performance, and ultimately enhancing the reliability and market competitiveness of your end products.

(Note: The actual application performance depends on specific operating conditions. Feel free to contact our technical team for more product information and technical support.)

To obtain more product documents and application details, please contact us via:

Mobile: (+86)181-6277-0058

Email: sales@cfsilanes.com

Key words:epoxycyclohexylethyl terminated polydimethylsiloxanes; alicyclic epoxy potting.