ASTM_D_3917_-_15e1.pdf

Designation:D3917151Standard 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.1NOTEEditorial corrections were made in July 2015.1.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.3.Dimensional Criteria3.1 Cross-sectional dimensions for standard rods,bars,andshapes shall be prescribed in Table 1.3.2 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).3.4 Twist tolerances for bars and shapes shall be as pre-scribed in Table 4(also see 4.3).3.5 Flatness(flat surface)tolerances for bars,solid shapes,semihollow shapes,and flat sheet shall be as prescribed inTable 5.3.6 Flatness(flat surface)tolerances of hollow shapes shallbe as prescribed in Table 6.3.7 Angularity tolerances for bars and shapes shall be asprescribed in Table 7(also see 4.4).3.8 Camber tolerances for shapes can be as prescribed inTable 8,if required by the customer.Camber is not specifiedfor standard shapes but will be a special customer requirement.3.9 The selection,type,and amount of reinforcements,aswell as resin system used,directly affect dimensions.Toler-ances shall be agreed upon between the supplier and the user.3.10 Squareness of end cut for bars,solid shapes,semihol-low shapes,and flat sheet shall be as prescribed in Table 9.4.Test Methods4.1 Obtain the specified tolerances with conventional mea-suring equipment.Measuring procedures,gages,and fixturesshall be agreed upon between the supplier and the user.4.2 Measure departure from straightness by placing thesection on a level table so that the arc or departure fromstraightness is vertical.Measure the vertical depth of the arcwith a feeler gauge,a straightedge,or both.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 April 1,2015.Published April 2015.Originallyapproved in 1980.Last previous edition approved in 2012 as D3917-12.DOI:10.1520/D3917-15E01.*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 4.3 Measure twist by placing the pultruded section on a flatsurface and using an inclinometer.An inclinometer is acommercially available device used to measure the angle ofinclination.4.4 Measure angles with protractors or gauges.5.Keywords5.1 dimensional tolerance;pultruded shapes;thermosettingplasticTABLE 1 Cross-Sectional DimensionsStandard Rods,Bars,and ShapesNOTE1The minimum tolerances are applicable for thicknesses less than 0.05 in.(1.27 mm).Solid 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.