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Environmental stress-cracking is the failure of a plastic material in the
presence of certain types of chemicals. This failure is not a result of
chemical attack. Simultaneous presence of three factors causes stress-cracking:
tensile stress, a stress-cracking agent and inherent susceptability of the
plastic to stress-cracking.
Common stress-cracking agents are detergents, surface active chemicals,
lubricants, oils, ultra-pure water and plating additives, such as brighteners
and wetting agents. Relatively small concentrations of stress-cracking agent
may be sufficient to cause cracking.
Mixing and/or dilution of certain chemicals may result in reactions which
produce heat which can cause product failure. Pretest your specific usage and
always follow correct lab safety procedures.
ATTENTION: Please be aware that, although several polymers may have excellent
resistance to various flammable organic chemicals and solvents, OSHA H CFR 29
1910.106 for flammable and combustible materials, or other local regulations,
may restrict the volumes of solvents which may legally be stored in an enclosed
area.
Caution: Do not store strong oxidizing
agents in plastic labware except those made of TEFLON FEP or PFA. Prolonged
exposure causes embrittlement and failure. While prolonged storage may not be
intended at time of filling, a forgotten container will fail in time and result
in leakage of contents. Do not place any plastic labware in a flame. Type HP
beakers are the only NALGENE products designed for hot plate use.
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