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Chemical Stability of Disposables

in the material's mechanical properties
  • The formation of tension cracks resulting from mechanical stress and surface-active substances (detergents, oils). The stress can be caused by internal forces (inherent material stress) or as a consequence of an external process (centrifugation).
  • The formation of tension cracks reveals that disposables, e.g. micro test tubes of the same type, can react differently with the same chemical, depending on the forces exerted upon the tube. Apart from inherent and operational stress, the disposable's chemical stability is also subject to the influences of temperature, concentration level, period of exposure, and any synergistic effects of solvent mixtures. The following classification is therefore only able to provide information of a general nature. In case of any doubt, you must conduct a test. Please also note our specifications on autoclavability (121C, 20 mins) of Eppendorf disposables. It is possible to attain the ultimate in safety by using the disposable tips and tubes once only.

    For each chemical, two figures are stated (X/X). The first figure (left) is the stability at a test temperature of +20C, the second figure (right) is the stability at +50C.

    1 = resistant, can be used for weeks and months
    2 = sensitive, can be used for 10 minutes to several hours
    3 = incompatible through to violent reactions
    0 = non tested PE = polyethylene
    PMMA = polymethylmethacrylate
    PP = polypropylene
    PS = polystyrene
    PC = polycarbonate
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