This specification covers a limit for thermal residual stress in reusable annealed glass laboratory apparatus as determined by prescribed photoelastic measurement procedures. This specification recognizes that photoelastic measurements are proportional to the difference of the principal stresses. The stress limit shall be measured and calculated to meet the specified requirements.
Область применения1.1 This specification covers a limit for thermal residual stress in reusable annealed glass laboratory apparatus as determined by prescribed photoelastic measurement procedures.
1.2 In broad classification, the laboratory glassware items covered by this specification, but not limited to, are:
| beakers | Imhoff cones |
| bottles, aspirator | impingers |
| bottles, dropping | jars, battery |
| bottles, gas washing | jars, bell |
| bottles, infusion | jars, chromatography |
| bottles, milk test | jars, cylindrical |
| bottles, reagent | joints, ball and socket or standard taper |
| bottles, weighing | manometers |
| bulbs, absorption | percolators |
| bulbs, leveling | pycnometers |
| bulbs, sampling | stopcocks |
| burets | tubes, centrifuge |
| condensers | tubes, chromatography |
| crystallizing dishes | tubes, color comparison (turbidity) |
| culture dishes | tubes, combustion (ignition) |
| custom apparatus | tubes, connecting and adapter |
| cylinders, graduated | tubes, digestion |
| and plain | tubes, drying |
| desiccators | tubes, fermentation |
| extraction tubes | tubes, thistle (spray traps) |
| flasks | vapor traps |
| fritted ware | viscometers |
| funnels | watch glasses |
| generators, Kipp |
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| grinder, tissue |
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1.3 This specification recognizes that photoelastic measurements are proportional to the difference of the principal stresses. The limit imposed represents a safety factor to cover a situation in which one of the principal stresses may be larger than the apparent stress.
1.4 This specification applies only to annealed glassware that is intended for sale as such. It excludes glassware that has been thermally tempered, ion-exchanged, or laminated with glass layers of differing expansion. The intent of this specification is to limit the residual stresses for safe consumer use in annealed glass, as it leaves the manufacturer.
1.5 Stresses introduced by thermal expansion differences within the glassware are covered by this specification. Graded and glass-to-metal seals are excluded.
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