Presentation 2nd IAG Task1 Codes of practice - ESR Technology

BS 4994: 1987 Table 16 - Permissible limits for laminate defectsDefect Inner (process) surface (thermoset linings only) Outer (non-process) surfaceBlisters None Maximum 6 mm diameter, 1.5 mm highChips None Maximum 6 mm, provided it does notCracks None NoneCrazing None Slightpenetrate the reinforcing laminateDry spotsEntrapped airNoneNone at surface. If in laminate,Maximum 10 per m 2 with total notgreater than 100 mm 2 in area3 mm diameter maximum; inot greater than 1.5 mm diameter andno more than 3 % of areanot more than 2/100 mm 2Exposed glass None NoneExposed cut edges None NoneForeign matter None None if it affects the propertiesof the laminatePits Maximum 3 mm diameter, 0.5 mm deep, Maximum 3 mm diameter, 1.5 mm deepnumber shall not exceed 1/10 4 mm 2Scores Maximum 0.2 mm deep Maximum 0.5 mm deepSurface porosity None NoneWrinkles Maximum deviation 20 % of wall thickness Maximum deviation 20 % of wall thicknessbut not exceeding 3 mmbut not exceeding 4.5 mmSharp discontinuity Maximum 0.5 mm Maximum 1 mm© 2003 AEA Technology plc