The conical, straight-sided pint glass, also known as a Boston shaker glass, was originally used to shake cocktails, not serve beer. But it has been a fixture in bars since the early 20th century, thanks to its utility: Itâs easy to stack, hard to break and perfect for displaying beer or bar advertisements.
Apart from glove material, other factors contributed to glove permeability, such as the duration of exposure, the thickness of the material, and the liposolubility or the molecular weight of the drug. Permeation was clearly related to the duration of exposure. All glove materials displayed a general trend toward greater permeation over time, increasing by a mean 5-fold factor between 15 and 60 minutes (the steepest increase being observed during the first 15 minutes).
Prior to ASTM D6978-05 many exam gloves were tested against ASTM F739. âResistance of Protective Clothing Materials to Permeation by Liquids or Gases. Under Conditions of Continuous Contactâ. ASTM D6978-05 uses ASTM F739. as a test method, but has a chemical permeation requirement that is 10 times. more stringent than what is required by ASTM F739. Users of gloves tested. under ASTM D6978-05 have a higher level of confidence that the gloves they.