HRA85 Hardness Rubber Ceramic Liners Impact Resistant Ceramic Wear Liner

Product Description

HRA85 Hardness Rubber Ceramic Liners Impact Resistant Ceramic Wear Liner

In transfer chutes and hoppers, abrasion is rarely the only problem. Large particles may strike the lining while smaller particles continue sliding across its surface. A hard lining may resist abrasion but crack under repeated impact, while rubber alone may absorb impact but wear too quickly.

HRA85 hardness rubber ceramic liners combine small alumina ceramic tiles with resilient rubber to manage both wear mechanisms. The ceramic surface protects against sliding abrasion, while the rubber layer absorbs vibration and reduces the peak impact transferred to individual ceramic pieces.

The resulting impact-resistant ceramic wear liner is mainly used in bulk-material handling equipment where abrasion and moderate impact occur together.

HRA85 refers to the hardness of the alumina ceramic—not the rubber. The rubber compound is normally evaluated using Shore A hardness, tensile strength, and elongation.

How the Composite Structure Works

Small square or hexagonal ceramic pieces allow the rubber matrix to deform locally when material strikes the panel. This helps distribute impact instead of transferring the entire load to one large, rigid ceramic plate.

However, smaller ceramic pieces also create more rubber joints. The ceramic size and arrangement should therefore be selected according to particle size, impact angle, and the balance between abrasion and impact.

Reference Material Properties

Alumina Ceramic

Rubber Layer

These values are general references. Final material properties, dimensions, and test requirements are subject to the confirmed technical specification.

Match the Liner to the Impact Level

A rubber ceramic liner should not be selected from ceramic hardness alone. The most important question is how the material reaches the equipment surface.

For severe impact from large, sharp material or a high vertical drop, a standard rubber ceramic panel may not be sufficient. A thicker rubber layer, larger impact-resistant ceramic shapes, ZTA ceramic, or a steel-backed mechanically fastened liner may need to be evaluated.

Where Rubber Ceramic Liners Usually Fail

1. Unprotected Leading Edges

If the material stream strikes the exposed edge of a panel, it can lift the rubber, damage the first row of ceramic, or open a path beneath the liner.

Panel orientation should be planned so that the material flows across the lining surface instead of directly against an exposed edge.

2. Incorrect Ceramic-to-Rubber Ratio

Adding more rubber does not automatically improve performance. Excessive exposed rubber may wear rapidly under continuous sliding abrasion.

Likewise, using a thin rubber layer beneath large ceramic tiles may provide insufficient cushioning when impact is the dominant problem.

3. Weak Ceramic–Rubber Bonding

Ceramic pieces must remain securely embedded during repeated impact and vibration. Local bonding defects can allow individual ceramic tiles to loosen even when the surrounding panel appears undamaged.

4. Poor Equipment-Surface Preparation

For bonded installation, the steel surface must be clean, dry, and properly prepared. Oil, rust, dust, and loose scale can reduce adhesion between the liner and the equipment shell.

5. Unsupported Panel Joints

Wide gaps or poorly aligned joints expose rubber and steel to concentrated wear. Joints near a direct impact zone require particular attention.

Bonded or Mechanically Fastened?

The product photographs mainly show ceramic tiles embedded in a rubber backing. This type of panel can be bonded directly to a prepared steel surface when the operating conditions and maintenance access are suitable.

For heavier-duty or replaceable installations, the composite liner may be produced with a steel backing plate. The steel-backed version can be fixed using bolts, studs, or a welding structure according to the equipment drawing.

The installation method should be confirmed before production because it affects the liner structure, overall thickness, and equipment interface.

Temperature: Check the Rubber, Not Only the Ceramic

Alumina ceramic is produced at high temperature and has good thermal stability, but this does not mean that a rubber ceramic composite liner can operate at the same temperature as a pure ceramic lining.

The operating limit is normally determined by:

• Rubber formulation
• Ceramic–rubber bonding system
• Adhesive used to attach the panel
• Continuous or intermittent heat exposure
• Temperature at the equipment wall
• Thermal cycling during operation

For this product structure, the general rubber temperature reference is up to 100°C. Applications above this range should be reviewed separately. High-temperature pneumatic conveying equipment may require welded ceramic, dovetail ceramic or another mechanically fixed structure without a standard rubber layer.

Typical Equipment

Rubber ceramic liners are commonly considered for:

• Transfer chutes
• Feed and discharge hoppers
• Coal drop chutes
• Vibrating-screen feed boxes
• Conveyor transfer stations
• Storage-bin transition areas
• Crusher feed and discharge sections
• Mineral-processing and bulk-handling equipment

They are used in mining, coal handling, cement, steel, power generation, ports, and other industries where falling or moving material creates both impact and abrasion.

The exact liner structure should be based on the location inside the equipment. A panel suitable for a sliding sidewall may not be suitable for the direct impact zone at the bottom of the same chute.

Manufacturing and Inspection Focus

During production, attention is given to:

• Ceramic grade and tile dimensions
• Ceramic arrangement and exposed surface coverage
• Ceramic embedment in the rubber
• Rubber thickness and panel dimensions
• Ceramic–rubber bonding condition
• Back-surface flatness
• Steel-backing and fastening positions, where applicable

Before delivery, the liner is checked for loose ceramic pieces, visible bonding defects, damaged edges, dimensional deviation, and conformity with the confirmed drawing.

Panels are packed in reinforced wooden cases or on suitable pallets. Ceramic surfaces, corners, and fastening parts are protected to reduce impact and movement during transportation.

Buyer Questions

1. Does HRA85 refer to the rubber hardness?

No. HRA85 refers to the Rockwell A hardness of the alumina ceramic. Rubber hardness is normally measured using the Shore A scale.

2. Why combine ceramic with rubber?

Ceramic provides abrasion resistance, while rubber helps cushion impact and vibration. The combination is useful where both wear mechanisms occur at the same location.

3. Are square tiles or hexagonal tiles better?

Neither shape is automatically better. The selection depends on panel flexibility, ceramic coverage, equipment curvature, particle size and impact direction.

4. Is thicker rubber always better for impact resistance?

No. Rubber thickness must be balanced with ceramic coverage and overall liner thickness. Too much exposed rubber may increase wear under continuous sliding abrasion.

5. Can the liner be used at 300–500°C?

A standard rubber ceramic composite liner is generally not suitable for that temperature range. The rubber and bonding system normally determine the operating limit. High-temperature equipment should use a separately designed ceramic fixing structure.

6. Can the panels be bolted onto the equipment?

Yes, when the liner is manufactured with a suitable steel backing and fastening structure. A rubber-backed panel without a steel plate is normally installed using an approved bonding system.

7. What information is required for liner selection?

Please provide the equipment drawing, liner quantity, material type, maximum particle size, drop height, impact angle, operating temperature, existing wear pattern, and preferred installation method.

A useful starting point is a photograph showing exactly where the existing liner fails. Elacera® can then review whether the problem is caused mainly by sliding abrasion, direct impact, panel-edge exposure, or an unsuitable attachment method.