Core Product

Bump Stops / Rubber Buffers

Name: Bump Stops / Rubber Buffers - Microcellular PU
Brand: Chilong Bearing Technology
Availability: InStock
Rating: 4.8 (156 reviews)

High-quality bump stops made from microcellular polyurethane (PU). These components provide progressive spring rate as the suspension approaches full compression, preventing metal-on-metal contact while maintaining ride comfort. Fatigue-resistant, customizable in shape and stiffness.

Microcellular PUProgressive Spring RateFatigue ResistantCustomizableOE Quality

Material

Microcellular PU

Density

0.3 - 0.7 g/cm³

Hardness

Shore A 50-95

Temp. Range

-40°C ~ 120°C

Compression Set

< 15% @ 70°C

Design Options

Solid, hollow, convoluted

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Product Overview

Bump stops, also known as rubber buffers or jounce bumpers, are essential suspension components that engage when the suspension approaches full compression. They provide a progressively increasing spring rate to absorb large impacts smoothly, preventing the shock absorber from bottoming out and protecting suspension components from damage.

Our microcellular polyurethane bump stops offer superior fatigue resistance compared to conventional rubber, with consistent performance across a wide temperature range. The microcellular structure provides progressive compression characteristics that enhance ride comfort without sacrificing protection.

Technical Specifications

Parameter	Specification
Raw Material	Microcellular Polyurethane (PU)
Density Range	0.3 - 0.7 g/cm³
Hardness Range	Shore A 50 - 95
Working Temperature	-40°C ~ +120°C
Compression Set	< 15% (22h @ 70°C, 25% deflection)
Tensile Strength	≥ 8 MPa
Elongation at Break	≥ 250%
Fatigue Life	≥ 500,000 cycles

Key Features

Progressive Protection for Your Suspension

Progressive Spring Rate

Microcellular structure delivers gradually increasing resistance as compression increases, providing a smooth transition to the bump stop.

Fatigue Resistance

PU material maintains its shape and performance characteristics even after millions of cycles in demanding conditions.

Temperature Stability

Consistent damping and compression characteristics across the full -40°C to 120°C operating range.

Custom Designs

Available in solid, hollow, and convoluted designs. Shape, height, and stiffness can be tailored to your application.

Applications

Our bump stops are suitable for a wide range of vehicles and suspension types:

Passenger Cars

Sedans, hatchbacks, wagons

SUVs & Light Trucks

Heavy-duty applications

Performance Vehicles

Sport-tuned suspensions

Customization Options

Shape & Profile — Cylindrical, tapered, stepped, or multi-stage designs.
Internal Geometry — Solid, hollow core, or convoluted for specific rate curves.
Stiffness Tuning — Adjust density and material formulation to achieve desired spring rate.
Integrated Features — Combine with dust cover or mounting bracket in one piece.
Color Options — Standard black or custom colors for brand identification.