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Tear test, paper

A number of gas tests are based on reactions of the gases with one or more moistened test papers. Several different moist test papers can be placed in the concave dip of a watch glass which can then be inverted over a test tube from which gas is evolving. This procedure allows you to get ready for the gas tests before the reaction evolving gas is initiated and also permits you to use several different test papers simultaneously. To conserve test papers in experiments where they are used repeatedly, it may be necessary to tear test papers into small pieces. [Pg.35]

Test your urease test strips as follows. Tear off about a 1 cm piece of the urease-bromthymol blue test paper and place it on a microscope slide. Pipet one drop of urine onto the test paper, and cover it with a second microscope slide, or cover plate. If urea is present, the paper will turn blue in a few minutes. [Pg.618]

Testing of plastic films - Tear test using trapezoidal test specimen with incision Testing of paper - Determination of tearing resistance according to Elmendorf (single tear tester)(withdrawn replaced by ISO 1974 2012)... [Pg.178]

Karenlampi P (1996) Strength and toughness of paper the effect of pulp fibre properties. Doctoral thesis, Helsinki University of Technology, Reports, Series A 4, Espoo Kettunen H, Nikanen KJ (2000) On the in-plane tear test. Tappi J 83(4) 1-6 Klungness JH, Caufield D, Sachs I, Tan F, Skyes M (1994) Fiber loading a progress report. [Pg.151]

All application verification and soil samples must be individually labeled with unique sample identification (ID) and other identifying information such as study ID, test substance name, sample depth, replicate, subplot and date of collection, as appropriate. Proper study documentation requires that sample lists and labels be created prior to work commencing in the field. Water- and tear-resistant labels should be used since standard paper labels may become water-soaked and easily torn during sample handling. Sample lists should have the same information on them as the labels and are a convenient place to record plot randomization, initials of the individual who collected the sample, and date of collection. As such, the sample list is important in establishing chain of custody from the point of sample collection until its arrival at the laboratory. [Pg.867]

Folding endurance under tension (10) is a favorite physical property for research on paper permanence and is the basis for the TAPPI method (16). Application of the mechanism involved in this test procedure, however, is unknown in practical uses for paper. Comparisons among product choices and estimates of their useful life should be based upon tests that assess physical properties of practical interest. Retention of reflective brightness, tear strength, tensile energy absorption, and... [Pg.312]

Matched sets of folding endurance and tear resistance test specimens were prepared from each paper to be aged at several temperatures. Aging was done in forced circulation ovens that were supplied with air having a dewpoint of 53°F. At intervals, sets of test specimens were removed from the oven and tested to monitor the deterioration process. [Pg.50]

The Schirmer II test can be performed in extremely dry eyes with very low results on Schirmer I. Before removing the paper strips at the conclusion of the Schirmer I test, a cotton swab is inserted into the nose to mechanically irritate the nasal mucosa. In normal subjects this stimulates an impressive basal tear secretion. If this response is present, ocular surface disease that has interfered with the normal neurologic feedback mechanism is suspected of contributing to the dry eye state. If the response is absent, lacrimal gland dysfunction is the likely cause. [Pg.421]

The phenol red thread test is also a method to quantitatively evaluate aqueous tear production.This test is similar to the Schirmer test, but instead of a paper filter strip a thin thread is inserted into the lower cul-de-sac about one-third of the distance from the outer canthus. The small caliber of the thread diminishes basal tear contribution as compared with the Schirmer I test.A color change in the thread from yellow to red makes the visibility of the wet versus dry portions of the thread readily visible. Interpretation of this test is also the subject of some debate, but it is generally agreed that after 15 seconds less than 10 mm of wetting is abnormal, whereas 20 mm or greater indicates normal tear production. This test is done one eye at a time, because measurement is made in seconds versus minutes. [Pg.421]

If the compound dissolved in the hot solvent and crystallized on cooling, the crystals should be obtained and their melting point determined in order to see whether purification has been effected. This may be done by collecting the crystals on a Hirsh or other type of microfunnel. However, the following technique is more convenient. A circle of filter paper about 13 mm in diameter is cut out with a well-sharpened cork borer. This is placed over the mouth of the test tube, and a hollow glass tear (Fig. 2-20) is placed over the filter paper. A retaining wire made from 20-gauge nichrome wire is placed over the tear, and a... [Pg.100]


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See also in sourсe #XX -- [ Pg.534 ]




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