FAQ: We currently heat 5 g of sample and visually inspect it for APHA/Pt-Co Color but would like to have a quantitative measurement. We would like to go ahead and order the vials and cell holder following your hot liquids color method. However, I have a question regarding the vials. According to the brochure, the black polypropylene caps can only be heated to 110-degrees C, and we need to heat to 200-degrees C. I was planning on heating samples in our oven, but it looks like that's not going to work if we use those caps. Is there a cap we can order that is compatible with the vials and can be used at high temperatures?

Answer:

Depending on the formulation and density, the polypropylene caps melt from 130 to 171 degrees C (266 to 340 degrees F). Aluminum melts at a much higher 660 degrees C (1220 degrees F).

Just for reference the clear borosilicate glass in the vials melts at 820 degrees C (1510 degrees F).

The 24 mm ID vials (20ml, 40ml, 60ml) have a 24mm x 400 style thread and the black polypropylene caps that come with the vials match that.

Aluminum metal caps of the same size and rating 24-400 (24mm x 400 style thread) can be purchased separately from any source. 

An alternative is to use metal foil as an enclosure to cover the vials.

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