How to choose polyurethane PU buffer block?

We have been talking about polyurethane buffer blocks these days. So, how to choose a good polyurethane buffer block? Bangborun provides you with the following suggestions::

1. The first choice for hardness (the only standard for towing)

hardness: 90 A~95A High density hard PU

70A/80A It is soft, easily crushed under the heavy weight of the trailer, lacks support, and cannot limit the load-bearing effect.

Material requirements: High density flame retardant and oil resistant PU， No whitening, no brittleness, resistance to compression permanent deformation

2. Height & length selection (the most critical)

No-load state measurement: Maximum clearance between frame and rear axle

Trailer full load sinking amount reserved: Reserve 20 ~30mm safety clearance

Selection formula：

PU Effective height of buffer block = Original vehicle limit clearance-trailer sinkage allowance

Light towing: Choose short limit PU buffer block

Heavy towing + Raise the car: Choose the longer and taller version for heavy loading PU buffer block

Integral bridge off-road: Choose a large diameter and thick model, which has a large force-bearing area and is not easy to crack.

3. Differentiation of installation locations

Rear axle (main load-bearing): 95 A hard PU Extra long style

Maebashi: 90 A Standard model with moderate hardness to ensure steering comfort

4. Trailer PU The core role of the buffer block

Supports the rear axle during extreme towing to prevent excessive sinking

Share spring pressure to avoid shock absorber damage

Reduce dragging, bumping and abnormal noise, and stabilize the rear posture of the car