ASTM_D_3917_-_15a.pdf

Designation:D391715aStandard Specification forDimensional Tolerance of Thermosetting Glass-ReinforcedPlastic Pultruded Shapes1This standard is issued under the fixed designation D3917;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification defines production tolerances appli-cable to standard rods,bars,shapes,and flat sheet pultrudedfrom thermosetting glass-reinforced plastics.1.2 These dimensional tolerances apply to all shapes speci-fied as“standard”by the pultrusion industry.1.3 Custom shapes and products designed for special appli-cations may carry specific tolerances that vary from thestandard.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 The following safety hazards caveat pertains only to thetest methods portion,Section 4,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.NOTE1There is no known ISO equivalent to this standard.2.Terminology2.1 Definitions:2.1.1 camberthe deviation of the edge or surface from areference straight line with the weight of the pultrusion notminimizing the measurement.2.1.2 flat sheeta rectangular solid pultruded profile with awidth of 12 in.up to and including 78 inches.2.1.3 mean wall thicknessthe average of two or more wallthickness measurements taken at multiple locations.2.1.4 straightnessthe upward deviation of a pultrudedshape when resting on a flat surface measured in a manner thatthe weight of the pultruded part minimizes the deviation.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.18 on ReinforcedThermosetting Plastics.Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 1980.Last previous edition approved in 2015 as D3917-15.DOI:10.1520/D3917-15A.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Dimensional Criteria3.1 Cross-sectional dimensions for standard rods,bars,andshapes shall be prescribed in Table 1.3.1.1 For die struck dimension,if the calculated tolerance asper above table is more than 0.094 in.(2.39 mm),then the diestruck dimension tolerance shall be 60.094 in.(2.39 mm).3.1.2 For wall thickness of open shapes and closed shapesand flatsheets of thickness under 0.125 in.(3.175 mm)dimensions,if the calculated tolerance as per above table is lessthan 0.01 in.(0.25 mm),the thickness tolerance shall be 60.01in.(0.25 mm).3.1.3 For wall thickness and flatsheets of thickness over0.125 in.(3.175 mm)dimensions,if the calculated tolerance asper above table is more than 0.05 in.(1.27 mm),the thicknesstolerance shall be 60.05 in.(1.27 mm).3.2 Length tolerances for standard rods,bars,and shapesshall be as prescribed in Table 2.3.3 Straightness tolerances shall be as prescribed in Table 3(also see 4.2).TABLE 1 Cross-Sectional DimensionsStandard Rods,Bars,and ShapesSolid Dimensions,in.(mm)ADie StruckDimensionA,BBWall ThicknessB(Open Shape)BThickness(Flat Sheets)CWall ThicknessB(Closed Shape)Thickness0.125(3.175)and underThicknessover 0.125(3.175)4%0.094(2.39)max10%0.010(0.25)min15%0.010(0.25)min10%0.050(1.27)max20%0.010(0.25)minAThe outside dimension of a part.BStandard pultruded section with dimension up to 36-in.(914-mm)diameter.TABLE 2 LengthStandard Rods,Bars,Shapes,and Flat SheetAllowable Deviation from Specified Length,+,in.(+,mm),except as notedLength up to 8 ft(2.44 m)inclusiveLength over 8 to 24 ft(2.44 to7.32 m)inclusiveLength over 24 ft(7.32 m)All Rods,Bars,and Shapes+0.25,0(+6.35,0)+0.5,0(+12.7,0)+3,0(+76.2,0)TABLE 3 StraightnessAStandard Bars,Rods,Shapes,and Flat SheetProductSpecified Diameter(Rods)Specified Width(Bars)Max Dimension(Shapes)Specified Thickness(Rectangles)Minimum Thickness(Shapes)Allowable Deviation(D)from Straight,in.(mm)in.(mm)in.(mm)In Total Length of PieceRods and square,hexagonal,andoctagonal barsall.0.030(2.5)length,ft(m)Rectangular barsUp to 1.499(38.07),inclUp to 0.094(2.4),incl0.050(4.17)measured length,ft(m)0.095(2.4)andover0.040(3.33)measured length,ft(m)1.500(38.10)and overall0.040(3.33)measured length,ft(m)ShapesOpenallall0.050(4.17)measured length,ft(m)ShapesClosedallall0.030(2.5)measured length,ft(m)Flat Sheetallall0.030(2.5)measured length,ft(m)AMeasured when weight of pultrusion minimizes the deviation by contact w