XRF SAMPLE CUP THIN-FILM WINDOW CHEMICAL RESISTANCE TEST PAPER

image of Chemical Resistant Test Paper

The need for a convenient method to determine the chemical resistance of a thin-film sample support material to exposure to different liquid sample substances before analysis prompted the development of Chemical Resistance Test Paper. Used in conjunction with referral to the listed "Chemical Resistance Chart" to sample substances expressed as chemical classification in the Thin-Film Section, Chemical Resistance Test Paper offers the analyst a secondary method to avoid thin-film sample support chemical degradation and potential damage to the instrumentation in advance. This becomes particularly important in planning to analyze samples of unknown chemical composition and inability to relate to a chemical classification listing.

The methodology is based on observing the formation of a stain on a specially processed colored paper. A test sample cup is prepared with the intended thin-film sample support and filled with a subject liquid sample substance. The assembled test sample cup is placed on a Chemical Resistance Test Paper Circle for a given length of time generally greater than the integration time of analysis. The existence of a stain indicates that there has been penetration of a sample substance through a considered thin-film sample support material. The absence of a stain insinuates acceptability of use.

It must be noted that chemical attack of the thin-film may be time related. In addition, chemical attack may assume different forms such as softening and sagging of the thin-film, creation and enlargement of minute pinholes, initial occurrence at the weakest points of contact of the thin-film stretched around the sample cup edge and intent to use at atmospheric pressure, pressured or evacuated optical environment and x-ray excitation temperature. Clear, volatile and aqueous liquids tend to evaporate quickly and present difficulty in observing staining.

Typical Applications

  • Mineral Oil
  • Diesel Fuel
  • Synthetic Diesel Fuel
  • Residual Oil
  • Waste Oil
  • Lubricating Oil
  • Gasoline
  • Organo Metallic Oil
  • Crude Oil
  • Light Oil
  • Biofuels
  • Synlubes
  • Metal Working Fluids
  • Motor Oil
  • Lubricants
  • Kerosene
  • Iso-octane
  • And many other petrochemical liquids formulated with Aliphatic Hydrocarbons and specifically with Aromatic Hydrocarbons.
 

Chemical Resistance Test Paper is provided in convenient-to-use 2-1/2" (63.5 mm) precut circles and packaged in quantities of 500 circles.

Specifications and Ordering Information

CAT. NO. DESCRIPTION NUMBER OF CIRCLES / PKG
6150 Thin-Film Window
Chemical Resistance Test Paper		 500
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