Liquid Silicone Shock Absorption Pad for Power Controller

# Liquid Silicone Shock Absorption Pad for Power Controller

Product Overview

The Liquid Silicone Rubber (LSR) Shock Absorption Pad for Power Controllers is a high-performance elastomeric component engineered to mitigate mechanical vibration, structural impact, and thermal stress in medium- and high-voltage power distribution and conversion systems. Manufactured via precision injection molding of food-grade and industrial-grade liquid silicone raw materials, this pad is tailored to address the unique harsh operating conditions of power electronics: it maintains stable performance across extreme temperature fluctuations, resists UV radiation and outdoor weathering, and provides consistent vibration damping for sensitive power controller components including IGBT modules, circuit boards, busbars, and housing assemblies.

Unlike traditional EPDM, neoprene, or polyurethane shock pads, this LSR pad exhibits zero plasticizer migration, minimal compression set after long-term load bearing, and excellent electrical insulation properties, eliminating the risk of creepage or short circuits in high-voltage environments. Its integrated micro-ribbed surface structure and customizable internal damping cavity design achieve a 75%+ vibration energy absorption rate at 10~2000 Hz common in power equipment operation, effectively preventing solder joint fracture, component loosening, and structural fatigue caused by fan operation, grid load fluctuation, and transportation vibration. This pad is available in custom cut-to-size, molded, and overmolded configurations to match the mounting footprint of indoor rack-mounted, outdoor pole-mounted, and vehicle-mounted power controllers.

Technical Specifications

Material Properties

Physical Performance

Process Parameters

Product Advantages

1. Superior Electrical Insulation for High-Voltage Safety

Formulated with high-purity silicone raw materials free of conductive impurities, this shock pad meets the insulation requirements of 10kV~35kV power systems, with a dielectric strength far exceeding that of traditional rubber shock absorbers. It eliminates the risk of partial discharge and creepage between the power controller housing and mounting base, and its stable insulation performance is unaffected by temperature, humidity, or surface contamination, reducing the failure rate of power control systems by 60% compared to non-silicone damping solutions.

2. Extreme Temperature Adaptability for Harsh Deployment Scenarios

Unlike EPDM pads that become brittle below -30°C and soften above 120°C, this LSR pad maintains consistent hardness and damping performance across a -60°C to +220°C operating range. It is suitable for outdoor pole-mounted controllers in alpine regions, vehicle-mounted controllers in new energy heavy trucks, and high-power controllers with long-term operating temperatures above 100°C, with no permanent deformation or performance degradation even after 1000 cycles of temperature shock between -40°C and 180°C.

3. Ultra-Low Compression Set for Long-Term Reliability

With a compression set of ≤5% after 22 hours of 100°C load testing, the pad retains 95% of its original thickness and damping capacity after 15 years of continuous load bearing. This avoids the common problem of traditional rubber pads loosening after 3~5 years of use, eliminating the need for periodic re-tightening of mounting bolts and reducing post-operation and maintenance costs for power systems by more than 30%.

4. Customizable Damping Performance for Targeted Vibration Control

The pad’s hardness, surface structure, and internal cavity design can be adjusted to match the specific vibration frequency of different power controller models. For high-frequency vibration from high-speed cooling fans, a 15 Shore A low-hardness pad with micro-porous structure is recommended, achieving an 82% vibration reduction rate; for heavy load-bearing scenarios of 50kg+ equipment, a 50~60 Shore A pad with reinforced rib structure provides stable support while maintaining 65%+ energy absorption efficiency.

Applications

This LSR shock absorption pad is widely used in power electronic systems across the following industries:

1. Grid Power Distribution Systems: Mounting shock absorption for indoor rack-mounted power distribution controllers, outdoor pole-mounted recloser controllers, and distribution automation terminal units (DTUs/FTUs), protecting internal circuit boards from vibration damage caused by wind load and grid switching operations.
2. New Energy Generation Systems: Damping for photovoltaic (PV) inverter controllers, wind turbine converter controllers, and energy storage system (ESS) power conversion system (PCS) controllers, mitigating vibration from fan operation and structural resonance of wind turbine towers.
3. New Energy Vehicle Powertrains: Vibration isolation for on-board charger (OBC) controllers, motor drive controllers, and high-voltage distribution units (HDUs) in electric passenger cars and commercial vehicles, resisting impact and vibration during vehicle operation and temperature fluctuations in the engine compartment.
4. **Industrial Power Control Systems: Shock absorption for high-power variable frequency drive (VFD) controllers, UPS power supply controllers, and industrial robot servo controllers, reducing vibration transmission to surrounding equipment and improving the operational stability of production lines.
5. Rail Transit Power Systems: Damping for traction power supply controllers and auxiliary power units in high-speed trains and urban rail transit vehicles, meeting the IEC 61373 railway equipment vibration and shock standard.

*Application Note: For outdoor or oil-immersed deployment scenarios, it is recommended to select a pad with a fluorosilicone coating to improve resistance to oil, acid rain, and salt spray corrosion; for applications requiring grounding, a local conductive silicone area can be reserved on the pad to achieve insulation in the main area and stable conductivity in the grounding position.

Selection Guide

Hardness Selection

• 15 Shore A: Suitable for light-load (≤10kg) high-precision controllers with low-frequency vibration below 100Hz, such as precision measurement power terminals; provides maximum vibration absorption, with a load-bearing capacity of 0.05~0.2 MPa.
• 30~40 Shore A: Universal grade for most medium-load (10~50kg) power controllers, including indoor DTUs, PV inverter controllers, and on-board OBCs; balances damping performance and support stability, with a load-bearing capacity of 0.2~0.5 MPa.
• 50~60 Shore A: Suitable for heavy-load (≥50kg) high-power controllers, such as 500kW+ VFDs and wind turbine converter controllers; provides high structural support, with a load-bearing capacity of 0.5~1.2 MPa.

Size Specifications

• Standard stock sizes include 100mm×100mm, 200mm×200mm, 300mm×300mm, with thickness ranging from 1mm to 20mm, suitable for small-batch prototype testing.
• Custom molded sizes are available for mass production, with maximum dimensions of 1200mm×800mm, and can be pre-punched with mounting holes, wire slots, and positioning notches to match the controller’s assembly footprint, eliminating secondary processing for customers.
• For overmolded solutions, the pad can be directly molded onto metal mounting brackets or plastic controller housings to improve assembly efficiency and bonding strength.

Material Grade

• Industrial Grade: Meets UL 94 V-0 flame retardant and RoHS 2.0 standards, suitable for most indoor and general outdoor power controller applications, with a cost advantage for mass production.
• Weather-Resistant Grade: Added UV stabilizers and anti-aging agents, passing 5000h QUVA testing and salt spray resistance testing, suitable for coastal, plateau, and other high-corrosion outdoor deployment scenarios.
• Medical Grade: Meets ISO 10993 biocompatibility standards, suitable for power controllers in medical equipment such as magnetic resonance imaging (MRI) systems and surgical robot power supplies, with no toxic gas release even under high-temperature combustion.

Quality Assurance

Our LSR shock absorption pads are manufactured in an ISO 9001 and IATF 16949 certified production facility, with a full-process quality control system covering raw material incoming inspection, production process monitoring, and finished product delivery testing:

1. Incoming Inspection: Each batch of LSR raw materials is tested for hardness, tensile strength, and volume resistivity to ensure consistency with formula specifications; raw material batches are traceable for 10 years.
2. Process Control: The injection molding process uses a closed-loop temperature and pressure control system with real-time monitoring of 12 process parameters, ensuring that the dimensional tolerance of each part is within the specified range; the molding defect rate is controlled below 0.1%.
3. Finished Product Testing: Each batch of products undergoes random sampling for compression set testing, dielectric strength testing, flammability testing, and vibration aging testing; unqualified batches are fully reworked or scrapped.
4. Certifications: All standard products have passed UL 94 V-0 flame retardant certification, RoHS 2.0, REACH, and CE certification; custom products can provide third-party test reports matching IEC, GB, and railway industry standards according to customer requirements.

We provide a 5-year warranty for all standard products: if the pad experiences performance degradation such as compression set exceeding 15% or insulation strength falling below the standard value within the warranty period under normal use conditions, we will provide free replacement or a full refund. For custom products, we provide free prototype testing and material performance matching services to ensure that the pad fully meets the operating requirements of your power controller.