Short answer:High-voltage electrical silicone rubber insulating components must simultaneously meet requirements for electrical clearance, creepage distance, resistance to tracking, resistance to corona, and environmental aging. The umbrella skirt structure, surface hydrophobicity, contamination level, and metal interfaces determine long-term insulation reliability.
In what kinds of situations are these silicone parts suitable?
Clearly defining the actual application scenarios helps translate material, structural, and validation requirements into actionable technical specifications.
- Protection for High-Voltage Connectors, Terminals, and Busbars
- Outdoor Insulation Sleeving and Sensor Encapsulation
- Flexible Insulation Isolation for Power Electronics Equipment
Parameters to Confirm Before Selecting a Model
We recommend providing the following information before requesting a quote or ordering a sample to minimize the need for repeated prototyping and misunderstandings regarding specifications.
- Operation and Surge Voltage, Pollution Level, and Altitude
- Creepage Distance, Clearance, and Mounting Method
- UV, Salt Spray, Damp Heat, and Flame Retardancy Requirements
Key Points in Structural Design
Structural dimensions, assembly relationships, and material elasticity must be evaluated together; simply increasing a single parameter generally does not directly improve reliability.
- Maintain electrical clearances and creepage distances in accordance with standards
- The umbrella-shaped skirt drains the charge and prevents electric field concentration at the tips
- The metal-insulation interface prevents air gaps and partial discharges
Production and Quality Control
Consistency in mass production results from the combined control of material batches, mold condition, molding windows, and inspection methods.
- Controlling Impurities in Insulation Formulations and Ensuring Uniform Mixing
- Eliminate air bubbles, gaps, and contamination inside the overmolded part
- Critical Dimensions and Electrical Performance: Tested by Batch
Recommended Verification Items
Validation should be conducted using actual or equivalent operating conditions whenever possible, and functionality should be reconfirmed after aging or cycling.
- Perform withstand voltage, partial discharge, and insulation resistance tests
- Retesting after exposure to electrical tracking, salt spray, and damp heat
- Inspection of Interfaces After Thermal Cycling and Mechanical Loading
Frequently Asked Questions
Does thicker silicone provide better insulation?
Structure, electric fields, and defects may be more critical than thickness.
Does surface dirt affect pressure resistance?
It will alter the creepage path and the risk of partial discharge.
How do I provide information to suppliers?
Please provide 2D or 3D drawings, photos of samples, material and hardness specifications, operating environment, target quantity, acceptance criteria, and a list of compliance documents. Based on this information, Chengxin Silicone Rubber can evaluate the materials, molds, molding process, and validation plan.