Lagging Performance Specifications

Hot Vulcanised Ceramic Lagging – Standard and FRAS

Hot Vulcanised Ceramic Lagging – Standard

Ceramic lagging manufactured using an abrasion resistant top rubber layer with aluminium oxide tiles bonded in place and an uncured bonding layer to provide high levels of adhesion after autoclave curing.

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 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 >20 N/mm & 100% Rubber Tear ASTM D429 Method B
Adhesion to Steel @ – 40 C >20 N/mm & 100% Rubber Tear or equivalent
Adhesion to Steel @ +50 C >10 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
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.

Hot Vulcanised Ceramic Lagging – FRAS

Ceramic lagging manufactured using an abrasion resistant FRAS rubber with aluminium oxide tiles bonded in place and an uncured 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

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
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 >20 N/mm & 100% Rubber Tear ASTM D429 Method B
Adhesion to Steel @ – 40 C >20 N/mm & 100% Rubber Tear or equivalent
Adhesion to Steel @ +50 C >10 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
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.