1、Designation: D 3917 08Standard Specification forDimensional Tolerance of Thermosetting Glass-ReinforcedPlastic Pultruded Shapes1This standard is issued under the fixed designation D 3917; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification defines tolerances applicable to stan-dard rods, bars, and shapes pultruded from
3、 thermosettingglass-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 shall carry specific tolerances that may vary from thestandard because a change in type o
4、r amount of reinforcementused in a composite directly affects dimensions. The tolerancesmay be wider or tighter than associated with “standard” shapes.1.4 The following safety hazards caveat pertains only to thetest methods portion, Section 4, of this specification: Thisstandard does not purport to
5、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.NOTE 1There is no similar or equivalent ISO standard.2.
6、 Terminology2.1 Definitions:2.1.1 Class 1 hollow shapeone whose void is round and 1in. (25 mm) or more in diameter and whose weight is equallydistributed on opposite sides of two or more equally spacedaxes.2.1.2 envelope diameterthe diameter of the smallest circlethat will completely enclose the cro
7、ss section of the pultrudedproduct.2.1.3 flange bowthe deviation where the flange of thesection contacts the horizontal plane.2.1.4 flange camberthe deviation from the flange surfaceto the reference straight line.2.1.5 mean wall thicknessthe average of two or more wallthickness measurements.2.1.6 st
8、raightnessthe perpendicular deviation of the pul-truded profile when resting on a flat surface.2.1.7 web bowthe deviation where the web of the sectioncontacts the horizontal plane.2.1.8 web camberthe deviation from the web surface tothe reference straight line.2.1.9 web-flange camberthe deviation fr
9、om the free edgeof the flange to the reference straight line.3. Dimensional Criteria3.1 Dimensional tolerances for cross sections shall be pre-scribed in Table 1.3.2 Width/diameter for solid rods and bars and lengthtolerances for standard rods, bars, and shapes shall be asprescribed in Table 2.3.3 S
10、traightness 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,and semihollow shapes shall be as prescribed in Table 5.3.6 Flatness (flat s
11、urface) 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 shall be as prescribed inTable 8 (also see 4.5). Camber is not specified for standardshapes but will be
12、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.4. Test Methods4.1 Obtain the specified tolerances with conventional mea-suring equipment.
13、 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 horizontal. Measure the depth of the arc with afeeler gauge, a straightedge
14、, or both.4.3 Measure twist by placing the pultruded section on a flatsurface and measuring the maximum distance at any pointalong its length between the bottom surface of the section andthe flat surface. From this measurement, subtract the deviationfrom true straightness of the section. The remaind
15、er is the1This 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 March 1, 2008. Published March 2008. Originallyapproved in 1980. Last previous edition approved
16、 in 2002 as D3917 - 96(2002)e1.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.twist. To convert the standard twist tolerance (degrees) to anequivalent linear value, m
17、ultiply the tangent of the standardtolerance by the width of the surface of the section that is onthe flat surface.4.4 Measure angles with protractors or gages. A four-pointcontact system is illustrated in Fig. 1, two contact points beingas close to the angle vertex as practical and the others near
18、theTABLE 1 Cross-Sectional DimensionsStandard Rods, Bars, and ShapesStandard Pultruded Section with Envelope Dimension up to 10-in. (254-mm) DiameterSpecified Dimension, in. (mm)Solid Dimensions, 6in. (mm)A,BAParallel to the LayeredConstruction (Perpendicularto Roving in allProducts)BPerpendicular t
19、o theLayered Construction(Mat and Mat-rovingProducts Only)C,DCWall Thickness CompletelyEnclosing Space 0.11 in.2(0.64 cm2) and Over(Eccentricity)E,F,GUp to 0.124 (3.15) incl 0.006 (0.15) 0.013 (0.33) 20 % of specified dimension0.125 to 0.249 (3.18 to 6.32) incl 0.007 (0.18) 0.018 (0.46) but not exce
20、eding either0.250 to 0.499 (6.35 to 12.67) incl 0.008 (0.20) 0.027 (0.69) 0.100 (2.54) max or0.500 to 0.749 (12.70 to 19.02) incl 0.009 (0.23) 0.038 (0.97) 0.010 (0.25) min0.750 to 0.999 (19.05 to 25.37) incl 0.010 (0.25) 0.034 (0.86)1.000 to 1.499 (25.40 to 38.07) incl 0.012 (0.30) . 20 % of specif
21、ied dimension1.500 to 1.999 (38.10 to 50.77) incl 0.014 (0.36) . but not exceeding either2.000 to 3.999 (50.80 to 101.57) incl 0.024 (0.61) . 0.100 (2.54) max or4.000 to 5.999 (101.60 to 152.37) incl 0.034 (0.86) . 0.010 (0.25) minAThe tolerances applicable to a dimension composed of two or more com
22、ponent dimensions is the sum of the tolerances of the component dimensions if all of thecomponent dimensions are indicated.BAllowable deviation from specified dimension where 75 % or more of the dimension is composite.CAt points less than 0.250 in. (6.35 mm) from base of leg, the tolerances of Dimen
23、sion A are applicable.DWhen more than 25 % of the specified dimension is space, the tolerances shall be agreed upon between the purchaser and the supplier at the time the contractororder is entered.EFor hollow or semihollow shapes, when the nominal thickness of one wall is three times or greater tha
24、n that of the opposite wall, the wall thickness tolerance shallbe agreed upon between the purchaser and the supplier at the time the contract or order is entered.FWhere dimensions specified are outside and inside, rather than wall thickness itself, the allowable deviation (eccentricity) given in Col
25、umn C applies to mean wallthickness.GTolerances in Column C take precedence over A dimension tolerances for walls which completely enclose 0.11 in.2(0.64 cm2) and over.TABLE 2 LengthStandard Rods, Bars, and ShapesSpecified Diameter (Rods)Specified Width (Bars) Allowable Deviation from Specified Leng
26、th, +in. (+mm), except as notedEnvelope Diameter (Shapes)in. (mm)Up to 12 ft (3.65 m)in Length, inclOver 12 to 24 ft (3.65to 9.14 m) in Length,inclOver 24 to 50 ft (9.14to 15.24 m) in Length,inclUp to 0.499 (12.67) incl 618 (63.18) 614 (66.35) 63(676.2)0.500 to 1.249 (12.70 to 31.72) incl 618 (63.18
27、) 614 (66.35) 63(676.2)1.250 to 2.999 (31.75 to 76.17) incl18 (3.18)14 (66.35) 63(676.2)3.000 to 7.999 (76.20 to 203.17) incl316 (4.76)14 (66.35) 63(676.2)D3917082ends of the respective surfaces forming the angle. Surfaceflatness is the controlling tolerance between these points ofmeasurement.4.5 Me
28、asure longitudinal curvature by placing the sectionon a level table so that the arc or curvature is vertical. Measurethe depth of the arc with a feeler gage and a straightedge.TABLE 3 StraightnessStandard Bars, Rods, and ShapesProductSpecified Diameter (Rods)Specified Width (Bars)Envelope Diameter (
29、Shapes)Specified Thickness(Rectangles)Minimum Thickness(Shapes)Allowable Deviation (D) from Straight, in. (mm)in. (mm) in. (mm)In1ft(0.3m)orLess of LengthIn Total Length of PieceRods and square, hexagonal,and octagonal barsall . 0.0125 (0.32) 0.0125 (0.32) 3 length, ft (m)Rectangular bars Up to 1.49
30、9 (38.07), incl Up to 0.094 (2.4), incl 0.050 (1.3) 0.050 (1.3) 3 measured length, ft (m)0.095 (2.4) and over 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)1.500 (38.10) and over all 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)Shapes Up to 1.499 (38.07), incl Up to 0.094 (2.4), incl 0.05
31、0 (1.3) 0.050 (1.3) 3 measured length, ft (m)0.095 (2.4) and over 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)1.500 (38.10) and over all 0.050 (1.3) 0.050 (1.3) 3 measured length, ft (m)AAMeasured when weight of pultrusion minimizes the deviation by contact with flat surface.TABLE 4 TwistASta
32、ndard Bars and ShapesProductSpecified Width (Bars)Envelope Diameter (Shapes)Specified Thickness(Rectangles)Minimum Thickness(Shapes)Allowable Deviation from Straight, degin. (mm) in. (mm)In1ft(0.3m)or Less of LengthIn Lengths Up to 20 ft (6 m)Bars Up to 1.499 (38.07), incl all 1 (0.3) 1 3 measured l
33、ength, ft (0.3 3 measuredlength, m) (7 max)1.500 to 2.999 (38.10 to76.17), inclall12 (0.15)12 3 measured length, ft (0.15 3 measuredlength, m) (5 max)3.000 (76.20) and over all13 (0.10)13 3 measured length, ft (0.10 3 measuredlength, m) (3 max)Shapes Up to 1.499 (38.07), incl 0.100 (2.54) and up 1 (
34、0.3) 1 3 measured length, ft (0.3 3 measuredlength, m) (7 max)1.500 to 2.999 (38.10 to76.17), incl0.100 (2.54) and up12 (0.15)12 3 measured length, ft (0.15 3 measuredlength, m) (5 max)3.000 (76.20) and over 0.100 (2.54) and up13 (0.10)13 3 measured length, ft (0.10 3 measuredlength, m) (3 max)AMeas
35、ured when weight of pultrusion minimizes the deviation by contact with flat surface.TABLE 5 Flatness (Flat Surfaces)Standard Bars, Solid Shapes,and Semihollow ShapesSurface Width, in. (mm)Maximum AllowableDeviation (D), in. (mm)Up to 1 (25.4), incl 0.008 (0.20)Over 1 (25.4) 0.008 (0.20) 3 W, in. (mm
36、)In any 1 in. (25.4 mm) of width 0.008 (0.20)D39170835. Keywords5.1 dimensional tolerance; pultruded shapes; thermosettingplasticTABLE 6 Flatness (Flat Surfaces)Standard Hollow ShapesMinimumThickness ofCompositeForming theSurface, in.(mm)Maximum Allowable Deviation (D), in. (mm)Widths up to1 in. (25
37、.4mm), incl, orany 1-in. (25.4-mm) Incrementof WiderSurfacesWidths over 1 in. (25.4 mm)Up to 0.187 (4.7), incl 0.012 (0.30) 0.012 (0.30) 3 W, in. (mm)0.188 (4.8) and over 0.008 (0.20) 0.008 (0.20) 3 W, in. (mm)TABLE 7 AngularityStandard Rods, Bars, and ShapesMinimum SpecifiedLeg Thickness,in. (mm)Al
38、lowable Deviation from SpecifiedAngle,6Angles 90 or less Angles more than 90Up to 0.749 (19.02), incl 112 112TABLE 8 CamberStandard ShapesProductEnvelope Diameter(Shapes)Minimum Thickness(Shapes)Allowable Deviation (D) from Straight, in. (mm)in. (mm) in. (mm)In1ft(0.3m)or less of lengthIn total leng
39、th of pieceShapes Up to 1.499 (38.07), incl Up to 0.094 (2.4), incl 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)0.095 (2.4) and over 0.031 (0.794) 0.031 (0.794) 3 measured length, ft (m)1.500 (38.10) and over All 0.031 (0.794) 0.031 (0.794) 3 measured length, ft (m)D3917084SUMMARY OF CHANGESC
40、ommittee D20 has identified the location of selected changes to this standard since the last issue(D3917 - 96(2002)e1) that may impact the use of this standard. (March 1, 2008)(1) Revised the definition of straightness in 2.1.6 for easiercustomer comprehension.(2) Added a comment in 3.8 that camber
41、is not normallyspecified by the pultruders.(3) Adjusted the thickness tolerance in Item C in Table 1 toinclude only a “-” (minus) value as opposed to a plus andminus value. There are six total adjustments under Item C.(4) Revised Table 2 to change the ranges from 12 to 30 ft to 12to 24 ft. Also, cha
42、nged the range from 30 to 50 ft to 24 to 50ft.(5) Adjusted the tolerance for the two longer lengths in Table2.(6) Added parentheses around “mm” in Table 5 and Table 6.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin th
43、is standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must b
44、e reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theres
45、ponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, W
46、est Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. 1 Four-Point Contact System for Angular MeasurementD3917085
