Lagging Performance Specifications

Cold Vulcanised Ceramic Lagging – Standard and FRAS

Cold Vulcanised Ceramic Lagging – Standard

Ceramic lagging manufactured using an abrasion resistant top rubber layer with aluminium oxide tiles bonded in place and a buffed CN bonding layer to provide high levels of adhesion.

RUBBER PROPERTIES

Base Polymer Natural or Synthetic Rubber
Hardness Range 65+/-5 ASTM D2240
Tensile Strength >15 MPa ASTM D412
Elongation at Break > 500% ASTM D412
Abrasion Loss (Volume Loss) <90 mm3 DIN 53516

CERAMIC PROPERTIES

Material Aluminium oxide >92%
Vickers Hardness > 900 ASTM E384
Fracture Toughness > 4.5 MPa*m1/2 Indentation Method
Dry Wheel Abrasion (Silicone Carbide) < 1.0 % weight loss ASTM G65
Microscopic Particle Size Average < 4 um
Microscopic Particle Size Range 1-6 um

ADHESION REQUIREMENTS

Adhesion to Steel @ 25 C >12 N/mm & 50% Rubber Tear ASTM D429 Method B
Adhesion to Steel @ -40 C >12 N/mm & 50% Rubber Tear or equivalent
Adhesion to Steel @ +50 C >6 N/mm & 100% Rubber Tear ASTM D429 Method B
Adhesion to Ceramic @ 25 C > 6 MPa & 100% Rubber Tear ASTM D429 Method F
Adhesion to Ceramic @ -40 C > 6 MPa & 100% Rubber Tear or equivalent
Adhesion to Ceramic @ +50 C > 3 MPa & 100% Rubber Tear ASTM D429 Method F
Adhesion to Ceramic @ 25 C (After outdoor ageing 12 months) > 6 MPa & 100% Rubber Tear ASTM D429 Method F or equivalent

Note: Adhesion may be carried out lagging strips and the adhesion values above would be expected to be met.

Nominal Thickness +/-1.0 mm
Thickness Variation (all strips/pulley) +/-0.5 mm

Thickness variation is measured on both sides of each lagging strip at each end and in the centre i.e. 6 points on each strip

Cold Vulcanised Ceramic Lagging – FRAS

Ceramic lagging manufactured using an abrasion resistant FRAS rubber with aluminium oxide tiles bonded in place and a buffed CN bonding layer to provide high levels of adhesion. This ceramic lagging is for use in applications where there is a risk of fire and/or explosion such as underground coal mines, and grain and sugar handling facilities and is a safety critical item.

RUBBER PROPERTIES

Base Polymer Synthetic Rubber
Hardness Range 65+/-5 ASTM D2240
Tensile Strength >15 MPa ASTM D412
Elongation at Break > 500% ASTM D412
Abrasion Loss (Volume Loss) <150 mm3 DIN 53516
Fire Resistant & Anti Static Properties PASS MDG 3608 August 2012

CERAMIC PROPERTIES

Material Aluminium oxide >92%
Vickers Hardness > 900 ASTM E384
Fracture Toughness > 4.5 MPa*m1/2 Indentation Method
Dry Wheel Abrasion (Silicone Carbide 60 grit) < 1.0 % weight loss ASTM G65
Microscopic Particle Size Average < 4 um
Microscopic Particle Size Range 1-6 um

ADHESION REQUIREMENTS

Adhesion to Steel @ 25 C >12 N/mm & 50% Rubber Tear ASTM D429 Method B
Adhesion to Steel @ -40 C >12 N/mm & 50% Rubber Tear or equivalent
Adhesion to Steel @ +50 C >6 N/mm & 100% Rubber Tear ASTM D429 Method B
Adhesion to Ceramic @ 25 C > 6 MPa & 100% Rubber Tear ASTM D429 Method F
Adhesion to Ceramic @ -40 C > 6 MPa & 100% Rubber Tear or equivalent
Adhesion to Ceramic @ +50 C > 3 MPa & 100% Rubber Tear ASTM D429 Method F
Adhesion to Ceramic @ 25 C (After outdoor ageing 12 months) > 6 MPa & 100% Rubber Tear ASTM D429 Method F or equivalent

Note: Adhesion may be carried out lagging strips and the adhesion values above would be expected to be met.

Nominal Thickness +/-1.0 mm
Thickness Variation (all strips/pulley) +/-0.5 mm

Thickness variation is measured on both sides of each lagging strip ate each end and in the centre i.e. 6 points on each strip.