Question/Answer

Is it class A? I am something looking for class A digestion cups 50 ml which can be digested in acid medium in 120 degree centigrate for 1 hour . Do you have something like that?

These vessels are tested for volume accuracy at all graduation lines by the procedures set forth in ASTM E542-01, Standard Practice for Calibration of Laboratory Apparatus. Volume accuracy is found to be within the Class A tolerance set forth in ASTM 1272-02, Standard Specification for Laboratory Glass Graduated Cylinders. However, glassware, not plastics, are Class A certified. We do not sell Class A certified digestion vessels.

What material is the green cap made of? I need this information for recycling purposes.

The cap is made of polypropylene with a polyethylene-faced liner.

We are seeing higher than normal Al in the new UC475GN 50 mL digstion vessels (over our RL) . I know the analysis is>50ppb. Do you have a COA for Al in SC481 cups?. Thanks.

SC481 is molded from a resin that comes from the medical field. We do not send certificates with this cup because our lowest detection levels are shown on the SC475 certificate. We have anecdotal evidence that the SC481 is cleaner but we do not yet have a way to quantify how much cleaner it is.

I was wondering what\'s the difference in your caps? Clear is linerless, but the white and green ones have a liner. Do they have a difference in the tightness of fit?

The natural, linerless caps extend the entire length of the neck, while the other two do not. All three caps basically have the same fit with the cup. The natural cap is made from the same polypropylene resin as the cups themselves and have the same background metals levels as stated on the COA.

What is the max temperature for UC475-WH - Ultimate Cup - 50mL?

These cups are molded from polypropylene which has a maximum operating temperature of 130°C. At this temperature, the polypropylene begins to soften and deform.

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