DD ISO/PAS 22574:2007

Foreword
Introduction
1 Scope
2 Characteristic features for friction materials
  2.1 Characteristic features for disc brake pads
      2.1.1 Gapping (between material and plate)
      2.1.2 Edge chipping
      2.1.3 Splits
      2.1.4 Minor splits
      2.1.5 Plucked and indented spigots
      2.1.6 Poor consolidated spigot holes
      2.1.7 Excess adhesive on plate
      2.1.8 Material flash on plate
      2.1.9 Abrasive coating
      2.1.10 Anti-noise coating runs
      2.1.11 Skin crazing
      2.1.12 Underlayer distribution
      2.1.13 Marking
      2.1.14 Unground material surface
      2.1.15 Paint on friction material surface
      2.1.16 Surface blisters
      2.1.17 Surface indentations
      2.1.18 Grinding marks on friction material surface
      2.1.19 Higher porosity area
      2.1.20 Poorly consolidated friction material
      2.1.21 Surface contamination with foreign matter
      2.1.22 Surface contamination with similar friction
             material
      2.1.23 Friction surface structure
  2.2 Characteristic features for drum brake linings
      2.2.1 Chipped edges/corners
      2.2.2 Edge splits
      2.2.3 Drill hole chipping at lining ends
      2.2.4 Drill hole burrs inside the surface
      2.2.5 Drill hole burrs outside the surface
      2.2.6 Cracks radiating from the rivet hole
      2.2.7 Paint on surface - Lining for riveting and
             bonding
      2.2.8 Surface cracks
      2.2.9 Marking
      2.2.10 Moulding skin on inside radius
             surface - Linings for bonding and riveting
      2.2.11 Moulding skin on outside radius
             surface - linings for riveting or bonding
      2.2.12 Surface blisters
      2.2.13 Surface grind marks
      2.2.14 Pitted surface (plucked surface)
      2.2.15 Surface structure
      2.2.16 Poor consolidation
      2.2.17 Inside surface indentations
      2.2.18 Outside surface indentations
      2.2.19 Concentration of self contained ingredients
             unless typical of the formulation
      2.2.20 High porosity area
      2.2.21 Metal wire or plastic reinforcement
      2.2.22 Foreign matter friction surface inclusion
  2.3 Characteristics features for bonded lined shoes
      2.3.1 Lining overhang on shoe platform edge
      2.3.2 Faulty shoes
      2.3.3 Restricted lever movement
      2.3.4 Stencilled information
      2.3.5 Excess adhesive exudation over shoe platform
            edges
      2.3.6 Excess adhesive exudation from lining ends
      2.3.7 Excess primer
      2.3.8 Lining surface condition
      2.3.9 Gaps between linings and shoe platform

Describes visual aspect for the identification and assessment of such product characteristics in quality assurance, as well as a basis for commercial and technical agreements.

Friction linings are composite materials with complex structure. Due to their composition and their production process, visual appearance characteristics can occur which in a precisely defined design are to be regarded as specific to the product. This International Standard defines visual aspect for the identification and assessment of such product characteristics in quality assurance, as well as a basis for commercial and technical agreements. The sequence of the product characteristics represents no order of priority. The brake linings are inspected in the “as supplied” condition, meaning unused. In some characteristic features, there are differences between brake linings with an effective lining pad surface