Boiling the samples

When I am preparing my samples I need to boil them for 1 hour and I need to keep the gas space (in the test tube) to the minimum – if we have 20 ml vials and 18 ml samples (8 ml filtrate+10ml NaOH) would it be safe to boil those?  Wouldn´t they explode? Should I use 22ml vials instead?

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