Mario Vermunt
Member
Good to know it works without pinholes as well.
Actually even a plastic box when sealed isn't oxygen tight, water and oxygen diffuse through commonly used PET material, though not a lot as well.
So still a little oxygen will diffuse through. The water will as well but so small that it is hard to measure, compared to the water weight typically put in.
I am a physicus and ever tested myself the diffusion of water through a plastic bag. a bag without water vapour inside, placed in an 100% relative humidity environment will have within a few days also 100% relative humidity. (due to milligrams of water diffusing through the plastic). Oxygen is molecular larger and will have a smaller diffusion rate, i don't know how much, but i guess some milligrams of oxygen a day for a typical plastic box will still diffuse in.
Thats also why wine is not often sold in plastic jars, because the shelf life is reduced by the oxygen diffusion.
Actually even a plastic box when sealed isn't oxygen tight, water and oxygen diffuse through commonly used PET material, though not a lot as well.
So still a little oxygen will diffuse through. The water will as well but so small that it is hard to measure, compared to the water weight typically put in.
I am a physicus and ever tested myself the diffusion of water through a plastic bag. a bag without water vapour inside, placed in an 100% relative humidity environment will have within a few days also 100% relative humidity. (due to milligrams of water diffusing through the plastic). Oxygen is molecular larger and will have a smaller diffusion rate, i don't know how much, but i guess some milligrams of oxygen a day for a typical plastic box will still diffuse in.
Thats also why wine is not often sold in plastic jars, because the shelf life is reduced by the oxygen diffusion.
