What cuvette to use for fast vaporizing liquids?

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For fast vaporizing liquids at room temperature, Teflon stoppers in cuvettes are currently being used, but they struggle to maintain a proper seal at temperatures above 15 degrees Celsius, leading to vapor escape. Alternatives such as Viton and urethane are suggested for stoppers due to their chemical resistance and better sealing properties. Viton is particularly noted for its effectiveness with aviation kerosene, while urethane offers a better grip. The discussion also raises the possibility of using parafilm to wrap the cuvette top as a temporary solution to prevent vapor loss.
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What type of cuvettes are you using for fast vaporizing liquids at room temperature ?
I found that cuvettes with Teflon stoppers are working so far but the problem is that at room temperature stopper to cuvette wall seal is not enough to hold that pressure so above 15degrees C vapours are finding their way out. I can't use stoppers with holes because of vapours (concentration in the sample is dropping).

Sample is aviation kerosene.
 
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Consider "Viton" or a urethane for a stopper material. Viton is used in carburetor float valves because it is impervious to both gasoline and alcohol. I mentioned urethane because it is 'grippyer'. Here is a link for chemical resistance of various polymers.
http://www.mossrubber.com/pdfs/Chem_Res.pdf
 
How long does the stuff in the cuvette have to last? Can you just wrap the top in parafilm and be done with it?
 

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