ASTM D2257 PDF

A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Threeoptions are included. Option 1 uses heat and Soxhlet extractionapparatus. Option 2 uses room temperature and extractionfunnels.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Threeoptions are included. Option 1 uses heat and Soxhlet extractionapparatus. Option 2 uses room temperature and extractionfunnels.

Option 3 uses either Option 1 or Option 2 extractionbut provides for calculation of extractable matter from the lossin mass of the material due to the extraction rather than theextractable matter residue. No other units of measurement are included in thisstandard. 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. See Sections6 and 7. Referenced Documents2.

For definitions of othertextile terms used in this test method refer to TerminologyD Summary of Test Method4. The solvents are evaporated and the residuesand the specimens are dried and weighed separately.

Theamounts of extracted matter are reported as percentages of1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D Current edition approved Feb.

Published February Originallyapproved in Last previous edition approved in as D — 98 DOI: United States1either the oven-dried mass or of the oven-dried mass pluscommercial moisture regain for the textile.

Extractable matter is calculated as the loss in mass reportedas percentages of the extracted oven-dried mass or this massplus commercial moisture regain for the textile. Significance and Use5. Competent statisticalassistance is recommended for the investigation of bias. As aminimum, the two parties should take a group of test speci-mens which are as homogeneous as possible and which arefrom a lot of material of the type in question. The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing.

The average results from the twolaboratories should be compared using appropriate statisticalanalysis and a probability level chosen by the two partiesbefore the testing begins.

If a bias is found, either its causemust be found and corrected, or the purchaser and suppliermust agree to interpret future test results with consideration tothe known bias. See 3. Apparatus and Reagents6. NOTE 2—If metal containers are used, check to ensure that theextracatable matter does not react with the metal if the residue is to beweighed. Warning—Varioussolvents have been used in the past, and are still used to someextent.

Many of these solvents are flammable, toxic or haveanesthetic effects, or unpleasant odors. As with all volatilesolvents, the use of adequate ventilation under a hood isrecommended when using this solvent. Otherwise there is a danger of building up adangerous concentration of explosive vapor in the oven.

Ovendoors have been blown across the room by the force of anexplosion. Consider shipping containers tobe the primary sampling unit. If differing numbers of packages are to be taken fromshipping cases in the lot sample, determine at random whichshipping cases are to have each number of packages drawn. If theshipping containers in the lot sample contain multiplepackages, take a laboratory sample from one package drawn atrandom from each container.

If necessary, take an additionalspecimen from a random unit in the laboratory sample untilthere is a total of ten specimens. Asuitably folded qualitative grade filter paper may beused in place of the thimble. Thimbles are not needed for fabricyarn or thread specimens. Thimbles must be longenough to cover the opening of the siphon tube. Be certain that the solvent is going throughthe thimble or filter paper during the extraction, and notoverflowing.

In case there is evidence that 20 siphonings arenot sufficient, the purchaser and supplier should agree upon asuitable number of siphonings.

Pour off the nearly pure solvent from the extraction tubeand save for reuse after suitable distillation. Transfer the contents of the flask to the tared weighing bottle,rinse with a small quantity of solvent, and add this to thecontents of the weighing bottle.

Cool in a desiccator and weigh. Repeat the drying,cooling, and weighing cycle until the difference in intervals of30 min results in a mass change of less than 0. NOTE 4—Solvent in weighing bottles may be recovered for subsequentreuse by connecting the effluent stream of solvent and air to a suitablecondenser. Extract through at least 12 siphon-ings.

Transfer the alcohol from the flask to the weighing bottle,evaporate the alcohol, dry, and weigh the residue to the nearest0.

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ASTM D2257

Manris You can download and open this file to your own computer aastm DRM prevents opening this file on another computer, including a networked server. Link to Active This link will always route to the current Active version of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Option 2 uses room temperature and extraction funnels. ASTM D — 98 Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of axtm standard. If the document is revised or amended, you will be notified by email.

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