Lagging Performance Specifications
DIRECT BOND CERAMIC LAGGING
Direct Bond Ceramic Lagging is the application of aluminium oxide tiles directly to the pulley shell using a two part engineering (epoxy) adhesive. The resulting lagging provides high levels of adhesion to both the ceramic tiles and the steel shell that results in a durable long lasting lagging.
As the tiles are bonded rigidly to the shell the risk of slippage between the ceramic tiles and the conveyor belt bottom cover is increased – as a result the risk of bottom belt cover wear also increases and should be checked using “Lagging Analyst” software to determine the extent of this risk.
Additionally the pulley shell must be designed to have less than 0.1 mm deflection at the pulley centre under maximum load to eliminate the chance of the tiles debonding and “popping off”.
CERAMIC PROPERTIES
| Material | Aluminium oxide >92% | |
| Vickers Hardness | > 900 | ASTM E384 |
| Fracture Toughness | > 4.5 MPa*m1/2 | Indentation method |
| Dry Wheel Abrasion 65 (Silicone Carbide 60 grit) | < 1.0 % weight loss | ASTM G65 |
| Microscopic Particle Size Average | < 4 um | |
| Microscopic Particle Size Range | 1-6 um |
ADHESIVE PROPERTIES
| Material | Engineering grade epoxy adhesive % | |
| Adhesion to Steel @ 25 C | >15 MPa & 100% Epoxy Tear | ASTM D429 Method F |
| Adhesion to Steel @ – 40 C | >15 MPa & 100% Epoxy Tear | or equivalent |
| Adhesion to Steel @ +50 C | >15 MPa & 100% Epoxy Tear | ASTM D429 Method F |
| Adhesion to Ceramic @ 25 C (After outdoor ageing 12 months) | >15 MPa & 100% Epoxy Tear | ASTM D429 Method F |
| Adhesion to Ceramic @ – 40 C | >15 MPa & 100% Epoxy Tear | or equivalent |
| Adhesion to Ceramic @ +50 C | >15 MPa & 100% Epoxy Tear | ASTM D429 Method F |
| Adhesion to Ceramic @ 25 C (After outdoor ageing 12 months) | >15 MPa & 100% Rubber Tear | ASTM D429 Method F or equivalent |
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