ASTM D2410-82

ASTM D2410 82 075'7510 0025418 b -!-\
-
Designation: D 2410 - 82
4CTb
AMERICAN SOCIETY FOR TESTING AND MATERIALS
1916 Race St., Philadelphia, Pa. 19103
Reprinted from the Annual Book of ASTM Standards, Copyright ASTM
If not listed in the current combined index, will appear in the next edition.
Standard Test Method for
FINISH CONTENT OF WOVEN GLASS FABRIC, CLEANED
AND AFTER-FINISHED WITH CHROME COMPLEXES, FOR
PLASTIC LAMINATES'
This standard is issued under the fixed designation D 2410; the number immediately following the designationindicates 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 (E) indicates an editorial change since the last revision or reapproval.
1. Scope
4.2 The chrome-complex finish enhances the
handleability of the fabric and improves the
1.1 This method covers the measurement of
mechanical properties of the glass fabric when
the amount of chrome-complex finish applied
used as a reinforcement in epoxy or phenolic
to various styles of woven glass fabric that have
laminates.
been suitably cleaned to remove the oils and
binders present on the yarn to make them
5. Apparatus
suitable for use in polyester laminates.
5.1 Electrophotometer.
1.2 Glass fabrics with this finish can be used
with polyester, epoxy, and phenolic resin sys-
6. Reagents and Materials
tems to produce laminates with a wide variety
6.1 Sodium Hydroxide Solution (100 g/L)-
of properties for general use and for use under
Weigh out 100 g of sodium hydroxide (NaOH,
conditions of high physical stress and moist
chemically pure), dissolve in distilled water,
environment.
and dilute to 1 L.
NOTE 1-This method is based on the use of a
6.2 Potassium Dichromate, Standard Solii-
Fisher AC Electrophotometer or equivalent.
tions-Place several grams of potassium di-
2. Applicable Document
chromate (K2Cr207) in a weighing bottle. Heat
the weighing bottle (lid off) for 1 h at 212 to
2.1 ASTM Standard:
220°F. Replace the cover on the weighing bot-
D 4029 Specification for Finished Woven
tle and allow to cool in a desiccator for 30 min. -
Glass Fabrics'
Weigh accurately 0.8484 g into a 50-mL beaker
3. Summary of Method and dissolve in distilled water. Transfer quan-
titatively to a 1000-mL volumetric flask, dilute
3.1 Specimens are boiled in sodium hydrox-
to the mark, and mix well. This solution wiii
ide solution. The chromium content of the
contain 0.0003 g chromium/mL. Use this final
material is measured, which is a reliable indi-
solution for calibration.
cation of the amount of chrome-complexfrnish
on the glass fabric.
7. Calibration
4. Significance and Use 7.1 By buret add 5 mL of standard KzCr207
solution to a 100-mL volumetric flask. Then
4.1 The purpose of this method is to provide
a means for determining the amount of
' This method is under the jurisdiction of ASTM Com-
mittee D-20 on Plastics and is the direct responsibility of
chrome-complex finish on glass fabrics that
Subcommittee D 20.18 on Reinforced Thermosetting Plas-
have met the requirements of Specification
tics.
D 4029 and whether it has been correctly ap- Current edition approved July 30, 1982. Published Octo-
ber 1982. Originally published as D 2410 - 65 T. Last pre-
plied. It is intended for use in specifications,
D 2410- 81.
vious edition
product evaluation, and quality control.
'Annual Book ofASTMSlandards, Part 33.
1

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ASTM D24LO 82 W 0759530 0025439 13
D 2410
add 2 mL of NaOH solution, dilute to the mark form. Always fill the cells to within 10 mm of
the top before placing them in the adapter.
with distilled water, and mix well.
7.2 Rinse a 25-mL photometer cell with Place a cell containing distilled water in the
rear position. Place filter 425-B in position. Set
some of this solution and then fill the cell.
intensity control to “ADJ.GAL.” and turn the
Measure the color against distilled water in the
photometer using a 425-B filter, “By’ setting. “adjust zero” knob so that the galvanometer
For detailed instruction on measurement of needle coincides with the index line.
color, see 7.1. The reading for this solution is 8.5 Next, set the intensity control to “B.”
equivalent to 0.01 % chromium on a 1.5-g sam- Pull the platform back until the catch is in firm
contact with the front stop. Close the compart-
ple.
7.3 For the next point, add 10 mL of stand- ment door. Adjust the dial control so that a
ard KzCr2O7 solution (by buret) to a 100-mL reading of zero is obtained on Scale “A.” De-
press the lamp button and adjust the initial nuli
volumetric flask, Add 2 mL of NaOH solution,
knob to bring the galvanometer needle back fo
dilute to the mark with distilled water, and mix
well, Measure the color of this solution as the index line. Since the lamp requires a few
before. The reading for this so
...