ASTM D1725-12(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D1725 − 12 (Reapproved 2019)
Standard Practice for
Preparing Resin Solutions for Viscosity Measurement by
Bubble Time Method
This standard is issued under the fixed designation D1725; 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 2.2 Other Document:
OSHA Regulations, 29 CFR, paragraphs 19.10.1000 and
1.1 This practice provides instructions for preparing resin
1910.1200
solutions viscosity measurement by bubble time method.
1.2 The values stated in SI units are to be regarded as the
3. Terminology
standard. The values given in parentheses are for information
3.1 For definitions related to hydrocarbon resins see Termi-
only.
nology D6440.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Practice
responsibility of the user of this standard to establish appro-
4.1 Solid resins are dissolved in organic solvents by cold-
priate safety, health, and environmental practices and deter-
cut or hot-cut methods in the laboratory. The viscosity of such
mine the applicability of regulatory limitations prior to use.
prepared solutions, or of commercial solutions of resins is then
For specific hazard statements, see Section 7.
determined by the bubble time method (Test Method D1545).
1.4 This international standard was developed in accor-
The bubble seconds are approximately equal to stokes.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Apparatus
Development of International Standards, Guides and Recom-
5.1 Bath, constant-temperature, consisting of a cylindrical
mendations issued by the World Trade Organization Technical
glass jar of about 5-gal capacity, or an aquarium tank with
Barriers to Trade (TBT) Committee.
controls capable of maintaining the temperature at 25 6 0.1°C
2. Referenced Documents with water as the bath medium.
2.1 ASTM Standards: 5.2 Bottles, 225-mL (8-oz), wide-mouth, screw cap.
D154 Guide for Testing of Varnishes (Withdrawn 2018)
5.3 Cellophane, sheet, cut into 102 or 127-mm (4 or 5-in.)
D1545 Test Method for Viscosity of Transparent Liquids by
squares.
Bubble Time Method
5.4 Corks, No. 2 short taper, to fit viscosity tubes.
D6440 Terminology Relating to Hydrocarbon Resins
E691 Practice for Conducting an Interlaboratory Study to 5.5 Holder for Viscosity Tubes, preferably a mechanical
Determine the Precision of a Test Method
holder withrackandpinionforinvertingthetubes.Theholder
should be checked with a small level and T-square to make
certain it holds the tubes in an exact vertical position after
This practice is under the jurisdiction of ASTM Committee D01 on Paint and being placed in the constant-temperature bath.
Related Coatings, Materials, and Applications and is the direct responsibility of
5.6 Bottle Shaker, preferably one which will give end-over-
Subcommittee D01.33 on Polymers and Resins.
Current edition approved June 1, 2019. Published June 2019. Originally end agitation.
approved in 1960. Last previous edition approved in 2012 as D1725 – 12. DOI:
10.1520/D1725–12R19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
Standards volume information, refer to the standard’s Document Summary page on 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
the ASTM website. www.access.gpo.gov.
3 5
The last approved version of this historical standard is referenced on Suitable mechanical viscosity tube holders are available from various labora-
www.astm.org. tory supply companies.
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D1725 − 12 (2019)
5.7 Timing Device, such as a stopwatch or electric stop possible as it is added. Place the cellophane sheet over the
clock capable of being read to a precision of 0.1 s. mouth of the bottle and screw on the cap tightly.
8.2.4 Immediately shake vigorously by hand and place on a
5.8 Viscosity Tubes, of clear glass and flat bottoms, having
shaker to give end-over-end agitation for an overnight period.
10.65 6 0.025-mm inside diameter and 114 6 1-mm outside
8.2.5 Check the weight of the bottle, cap, cellophane and
length. Plainly legible lines shall be located on the tubes as
solution to make certain that none was lost during the mixing.
follows:
If appreciable loss has occurred, discard the solution and
27±0.5mm
prepare a fresh one.
100 ± 0.5 mm
108 ± 0.5 mm
8.3 Hot-Cut Solutions:
All distances shall be measured from the bottom outside of
8.3.1 Prepare 100 g of solution as follows:Weigh a 250-mL
the tube. The distance between the first and second lines shall
Erlenmeyer flask with a ground joint to the nearest 0.05 g.
be 73 6 0.5 mm.
Weigh into the flask to the nearest 0.05 g the appropriate
amount of solvent (40 g for a 60 % solution).
6. Solvent
8.3.2 Weigh into the flask to the nearest 0.05 g the correct
6.1 The solvent used should be mutually agreed upon
amount (60 g for a 60 % solution) of the freshly crushed resin
between the purchaser and the manufacturer. Toluene, xylene,
passing a No. 10 (2000-
...