ASTM D3917-12
(Specification)Standard Specification for Dimensional Tolerance of Thermosetting Glass-Reinforced Plastic Pultruded Shapes
Standard Specification for Dimensional Tolerance of Thermosetting Glass-Reinforced Plastic Pultruded Shapes
ABSTRACT
This specification defines the dimensional tolerances of standard rods, bars, and shapes pultruded from thermosetting glass-reinforced plastics. Tolerances cover dimensional criteria for cross sections, width or diameter, straightness, twist, surface flatness, angularity, and camber.
SCOPE
1.1 This specification defines tolerances applicable to standard rods, bars, and shapes pultruded from thermosetting glass-reinforced plastics.
1.2 These dimensional tolerances apply to all shapes specified as “standard” by the pultrusion industry.
1.3 Custom shapes and products designed for special applications may carry specific tolerances that vary from the standard.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 The following safety hazards caveat pertains only to the test methods portion, Section 4, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Note 1—There is no known ISO equivalent to this standard.
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Designation:D3917 −12
StandardSpecification for
Dimensional Tolerance of Thermosetting Glass-Reinforced
1
Plastic Pultruded Shapes
This standard is issued under the fixed designation D3917; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Dimensional Criteria
1.1 This specification defines tolerances applicable to stan- 3.1 Dimensional tolerances for cross sections shall be pre-
dard rods, bars, and shapes pultruded from thermosetting scribed in Table 1.
glass-reinforced plastics.
3.2 Length tolerances for standard rods, bars, and shapes
1.2 These dimensional tolerances apply to all shapes speci- shall be as prescribed in Table 2.
fied as “standard” by the pultrusion industry.
3.3 Straightness tolerances shall be as prescribed in Table 3
1.3 Custom shapes and products designed for special appli- (also see 4.2).
cations may carry specific tolerances that vary from the
3.4 Twist tolerances for bars and shapes shall be as pre-
standard.
scribed in Table 4 (also see 4.3).
1.4 The values stated in inch-pound units are to be regarded
3.5 Flatness (flat surface) tolerances for bars, solid shapes,
as standard. The values given in parentheses are mathematical
and semihollow shapes shall be as prescribed in Table 5.
conversions to SI units that are provided for information only
3.6 Flatness (flat surface) tolerances of hollow shapes shall
and are not considered standard.
be as prescribed in Table 6.
1.5 The following safety hazards caveat pertains only to the
3.7 Angularity tolerances for bars and shapes shall be as
test methods portion, Section 4, of this specification:This
prescribed in Table 7 (also see 4.4).
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user
3.8 Camber tolerances for shapes can be as prescribed in
of this standard to establish appropriate safety and health
Table 8, if required by the customer. Camber is not specified
practices and determine the applicability of regulatory limita-
for standard shapes but will be a special customer requirement.
tions prior to use.
3.9 The selection, type, and amount of reinforcements, as
NOTE 1—There is no known ISO equivalent to this standard.
well as resin system used, directly affect dimensions. Toler-
ances shall be agreed upon between the supplier and the user.
2. Terminology
4. Test Methods
2.1 Definitions:
2.1.1 camber—the deviation of the edge or surface from a
4.1 Obtain the specified tolerances with conventional mea-
reference straight line. suring equipment. Measuring procedures, gages, and fixtures
shall be agreed upon between the supplier and the user.
2.1.2 mean wall thickness—the average of two or more wall
thickness measurements taken at multiple locations.
4.2 Measure departure from straightness by placing the
section on a level table so that the arc or departure from
2.1.3 straightness—the upward deviation of a pultruded
straightness is vertical. Measure the vertical depth of the arc
shape when resting on a flat surface measured in a manner that
with a feeler gauge, a straightedge, or both.
the weight of the pultruded part minimizes the deviation.
4.3 Measure twist by placing the pultruded section on a flat
2.1.4 unilateral tolerance—a tolerance in which the varia-
surface and using an inclinometer. An inclinometer is a
tion is permitted in one direction (either “+” or “-”) from the
commercially available device used to measure the angle of
specified dimension.
inclination.
1
This specification is under the jurisdiction of ASTM Committee D20 on
4.4 Measure angles with protractors or gauges.
Plastics and is the direct responsibility of Subcommittee D20.18 on Reinforced
Thermosetting Plastics. 5. Keywords
Current edition approved April 1, 2012. Published May 2012. Originally
5.1 dimensional tolerance; pultruded shapes; thermosetting
approved in 1980. Last previous edition approved in 2011 as D3917 - 11. DOI:
10.1520/D3917-12. plastic
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D3917−12
TABLE 1 Cross-Sectional Dimensions—Standard Rods, Bars, and Shapes
Standard Pultruded Section with Dimension up to 36-in. (914-mm) Diameter
A, A
Solid Dimensions, ±in. (mm)
A B C
Specified Dimension, in. (mm)
Die Struck Wall Thickness Wall Thickness
A
Dimension (open shape) (closed shape)
All ±4 % –10 % of specified –20 % of specified dimension, but not
(0.094 in. max) dimension, but not exceeding either
exceeding either –0.100 (2.54) max or
–0.100 (2.54)
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D3917–11 Designation: D3917 – 12
Standard Specification for
Dimensional Tolerance of Thermosetting Glass-Reinforced
1
Plastic Pultruded Shapes
This standard is issued under the fixed designation D3917; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification defines tolerances applicable to standard rods, bars, and shapes pultruded from thermosetting
glass-reinforced plastics.
1.2 These dimensional tolerances apply to all shapes specified as “standard” by the pultrusion industry.
1.3 Custom shapes and products designed for special applications may carry specific tolerances that vary from the standard.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.5 The following safety hazards caveat pertains only to the test methods portion, Section 4, of this specification: This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
2. Terminology
2.1 Definitions:
2.1.1 camber—the deviation of the edge or surface from a reference straight line.
2.1.2 mean wall thickness—the average of two or more wall thickness measurements taken at multiple locations.
2.1.3 straightness—the upward deviation of a pultruded shape when resting on a flat surface measured in a manner that the
weight of the pultruded part minimizes the deviation.
2.1.4 unilateral tolerance—a tolerance in which the variation is permitted in one direction (either “+” or “-”) from the specified
dimension.
3. Dimensional Criteria
3.1 Dimensional tolerances for cross sections shall be prescribed in Table 1.
3.2 Length tolerances for standard rods, bars, and shapes shall 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 prescribed 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 surface) tolerances of hollow shapes shall be as prescribed in Table 6.
3.7 Angularity tolerances for bars and shapes shall be as prescribed in Table 7 (also see 4.4).
3.8 Camber tolerances for shapes can be as prescribed in Table 8, if required by the customer. Camber is not specified for
standard shapes but will be a special customer requirement.
3.9 The selection, type, and amount of reinforcements, as well as resin system used, directly affect dimensions. Tolerances shall
be agreed upon between the supplier and the user.
4. Test Methods
4.1 Obtain the specified tolerances with conventional measuring equipment. Measuring procedures, gages, and fixtures shall be
agreed upon between the supplier and the user.
4.2 Measure departure from straightness by placing the section on a level table so that the arc or departure from straightness
is vertical. Measure the vertical depth of the arc with a feeler gauge, a straightedge, or both.
4.3 Measure twist by placing the pultruded section on a flat surface and using an inclinometer. An inclinometer is a
1
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.18 on Reinforced Thermosetting
Plastics.
Current edition approved April 1, 2011.2012. Published April 2011.May 2012. Originally approved in 1980. Last previous edition approved in 20082011as
D3917-08.D3917 - 11. DOI: 10.1520/D3917-112.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D3917 – 12
TABLE 1 Cross-Sectional Dimensions—Standard Rods, Bars, and Shapes
Standard Pultruded Section with Dimension up to 36-in. (914-mm) Diameter
A,A
Solid Dimensions, 6in. (mm)
A B C
Specified Dimension, in. (mm)
Die Struck Wall Thickness Wall Thickness
A
Dimension (open shape) (closed shape)
All 64% –10 % of specified –20 % of specified dime
...
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