Nov 1, ASTM D Standard Test Method for Rubber-Measurement of Unvulcanized Rheological Properties Using Rotorless Shear Rheometers. Find the most up-to-date version of ASTM D at Engineering ASTM D describes a test method for determining the rheological properties of raw rubber and uncured rubber compounds. Using the RPA, the viscosity and .

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Copyright Compu-tecture, Inc. Factory problem solving with non-linear viscoelasticity to solve Six Sigma problems In the late s, the RPA was found to be invaluable in quality programs such as Six Sigma in solving factory problems.

Eirich, Science and Technology of Rubber, Ch.


Part 2 of 2 By John S. Testing liquid elastomers Using the RPA, techniques were developed in to test liquid rubbers such as polyurethanes, silicones, polysulfides and certain liquid rubber adhesive compounds.

These tests are used routinely wstm the rubber industry to insure that new mixed rubber stocks can provide the dynamic properties needed for rubber product performance, whether it is needed for tires, v-belts, golf balls, isolators, dampers, bushings or conveyor belts.

Direct measure of stress relaxation with the RPA Insoftware was developed that qstm allow the RPA to directly measure stress relaxation of either a raw elastomer or a mixed stock.

This testing was applied to both natural and synthetic rubber. John Dick has over 39 years of experience in the rubber industry. In addition, high strain testing in the non-linear viscoelastic region proved very useful with raw rubber sources, as well.

This was applied to calculate cure equivalents in determining state of cure profiles in tire curing studies. Brown, Marcel Dekker Inc. Dick has authored over 80 journal and magazine publications, including five books on rubber technology. Today, some 12, ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence.

The correlation of dynamic complex viscosity and viscous heating can be affected by the filler loading level, type of filler and the thermal conductivity of the rubber compound. Search book title Enter keywords for book title search. This short test can be effective in preventing this problem from happening.


Goodrich, and later Uniroyal Goodrich Tire Co.

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The RPA is uniquely effective at directly measuring the viscous heating generated awtm an uncured compound when subjected to specified conditions of frequency and strain.

If you like to setup a quick demo, let us know at support madcad.

Cousins Bayerand J. Overview of rubber process testing in a changing global economy. The development of various RPA test methods and techniques occurred in three separate stages: It is interesting to note that on September 13,Alpha D62044 received the Trilogy Award for the creation of the ODR in recognition as one of the top tire technological achievements in the 20th Century. In addition, it was found that running the RPA tests at high strains was more effective at measuring carbon black structural differences that are imparted to rubber compounds.

Because of the significantly shorter test cycles, the MDR has almost completely replaced the ODR, which has helped the rubber industry achieve its doubling in production productivity in the last 20 years. Please login to your authorized staff account to use this feature.

Are you sure you want to empty the cart? These types of RPA test measurements helped motivate the development of ASTM D Part A in the late s for measuring these rheological differences within the linear viscoelastic region.

ASTM D6204 – 15

As a result, there are now nine standard ISO and ASTM methods that have been established to date, and more new methods being developed for the immediate future. No items in cart. Ferry, Viscoelastic Properties of Polymers, 3rd Ed. Also, with the programmable variable temperature analysis feature of the RPA, this instrument could also be used as a cure simulator for thick article cures, such as tires or conveyor belts.


Eirich, Chapter 8 by A. Because of length, it was not possible to publish the extensive figures that were included in this paper. Enter your personal account email address to request a password reset: These instruments were so successful that over 10, of them were used throughout the world by the end of the s.

However, the accuracy of the linear viscoelasticity from low strain testing is necessary for successful applications of time-temperature superposition TTS or finite element analysis modeling. Rubber compounders then would make judgments on the quality of a mixed batch of a rubber compound based on all five of their senses. RPA messurements at steadily increasing strain amplitude found that the correlation coefficient constantly improved significantly with higher applied strains.

From a joint study with the Rubber Manufacturers Association RMAit was found that higher strain test conditions with the RPA were necessary in order to distinguish important quality differences among quite different sources of natural rubber. This particular test is sensitive enough to be used for testing raw elastomers, as well as mixed stocks giving a better characterization of the ultimate state of mix than Mooney stress relaxation can give.

Remember me for one month. Print 1 2 3 4 5 page sstarting from page current page. Marcel Dekker,p. Enter your account email address to request a password reset: This standard test condition can be performed in only 2 minutes by the RPA in the factory.

Directly measuring viscous heating and heat buildup with the RPA Special methods were developed using the RPA to directly measure the viscous heating of a rubber compound that would result from processing a given uncured rubber compound in the factory, as well as also measuring the resulting heat buildup hysteresis d624 corresponding cured specimens which relate to dynamic product performance. There is only a minimal cost to modify an RPA for testing liquids.