ASTM D7409-15 (2020) pdf free

04-10-2021 comment

ASTM D7409-15 (2020) pdf free.Standard Test Method for Carboxyl End Group Content of Polyethylene Terephthalate(PET) Yarns.
This test method can be used for manufacturing qualitycontrol or manufacturing quality assurance purposes to determine the CEG concentration of PET yarns used in eithergeogrids or geotextiles.
The CEG content of the PET yarns may have aninfluence on the properties of the geosynthetic,such as itshydrolysis resistance. The lower the value,the higher thehydrolysis resistance of the yarns.
This test does not set the limiting (maximum) value forvarious engineering applications.Such a specification is adecision of the design engineer, owner,and/or regulator.
An automatic titrator is the preferred equipment for thistest method. However,acceptable results can be achievedmanually with the use of a micro burette, with 10 mL capacityand accurate to 0.02 mL.
A potentiometric titration assembly is required for apotentiometric titration.The assembly consists of an automatictitrator fitted with a three-electrode system together with aburette assembly,magnetic stir bar,magnetic stir plate,andglass beaker.
A temperature bath or hot plate that can maintain atemperature of 100 °C.
It is both toxic and combustible. It may beabsorbed through the skin.Avoid inhalation and skin contact.Wear the appropriate safety equipment required for handling atall times.If contact is made with the skin, wash the affectedarea with soap and water for at least 15 to 20 min. In case ofeye contact,flush the eyes with water for 20 min and getmedical attention immediately.
It is toxic and flammable.Avoidskin contact and breathing vapors. If ingested, could cause painin the nose,mouth,and throat. Could induce vomiting,diarrhea, dizziness, hypotension,collapse,coma, or death. Incase of eye or skin contact,wash with water for 15 to 20 minand seek medical attention immediately.Remove the flask from the hot source as soon as the PET yarn is completely dissolved and quench by carefullyadding 60 mL of dichloromethane to the ortho-creosol solution.Stir for an additional 5 min.
Titrate the PET solution with KOH/methanol solutionusing an autotitrator.
If colorimetric titration is used,two drops of 1%bromophenol blue indicator in methanol should be added to thePET solution and titrated to a violet endpoint.The test procedure is performed on three samples anda blank. The blank shall be treated identically to the samples.ASTM D7409 pdf download.

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