Mooguk This practice covers two procedures applicable to all adhesives having a relatively short working life. This test method covers measurement of the comparative tack of pressure-sensitive adhesives by a rolling ball and is most appropriate for low-tack adhesives. Two methods are described as follows:. It is intended to determine whether the working life conforms to the minimum specified working life of an adhesive required by consistency tests qstm by bond strength tests, or by both. When properly conducted, the test will enable detection of molecular layers of hydrophobic organic 1d
|Published (Last):||23 November 2016|
|PDF File Size:||15.26 Mb|
|ePub File Size:||19.4 Mb|
|Price:||Free* [*Free Regsitration Required]|
A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. The values in parentheses are for information only. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.
Referenced Documents2. Compare consistency. Theviscosity of a liquid is a measure of the internal friction of theliquid in motion. The unit of dynamic viscosity is the poise,which is expressed as dyne-seconds per square centimetre.
Fora Newtonian liquid, the viscosity is constant at all shear rates. For a non-Newtonian liquid, viscosity will vary depending onshear rate. Significance and Use4. For adhesives not fitting into this category, Test MethodD should be considered.
Four test methods are covered asfollows Current edition approved Feb. Published February Originallyapproved in Last previous edition approved in as D — 97 DOI: United States First Cup 0. The diameter ofthe Orifice pressed in the cup shall be stamped on the cup. Then mount the consistency cupin the clamp provided for the purpose and place the receivingcylinder in position.
With the outlet of the cup closed by meansof the finger, pour the sample into the cup until it is filled tooverflowing. Strike off the excess with a straightedge, and thenremove the finger from over the outlet and allow the sample toflow into the receiving cylinder. Determine the number ofseconds from the time the finger is removed from the orificeuntil the top of the meniscus reaches to mL mark on thecylinder by a stop watch and record as the viscosity of thematerial.
All dimensions are in mmFIG. Nonstandard containers may be usedby mutual agreement, when necessary to prevent corrosion orother deleterious effects of metal cans. Protect adhesives containingvolatile solvents from evaporation during conditioning. Ifspecial conditioning methods are necessary, such as the use ofa circulating water bath. Report this in Set the revolution counter at 10revolutions below the zero mark.
Use a falling weight of suchmagnitude that a minimum time of 20 s is required for revolutions of the paddle when the test is conducted asspecified in Choose the weight from the series 50, ,, , and g. Fasten the paddle securely on the shaft,place the container on the platform, and raise until the surfaceof the adhesive just reaches the mark on the stem of the paddle.
This ensures uniform depth of immersion of the paddle. Note the time for revolutions accurately to the closest 0. Make a minimum ofthree determinations. The number of the cup shall be stamped on aplate on the cup. They are not intended for usein converting centipoises to Zahn seconds. Orifice Size, in.
Other temperatures of test are optional. Protect adhesivescontaining volatile solvents from evaporation during condi-tioning. If special conditioning methods are necessary, such asthe use of a circulating water bath, they shall be specified in Liftthe viscometer out of the sample Note 1.
Determine by meansof a stop watch the number of seconds from the time the topedge of the viscometer cup breaks the surface until the steadyflow from the orifice first breaks, and record this time as theconsistency of the material. Record the temperature of thesample and the number of the cup. NOTE 1—Time of removal must be rapid.
Unless build-up of adhesiveon the side of the cup occurs, the time of removal should be about 1 s. Precision and Bias 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 be 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 theresponsible 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.
ASTM D1084 PDF
Brookfield© Original Viscometer