Gas Used In Gas Struts

As far as I can tell from the table here, the viscosity of air (mostly nitrogen) varies from about 13.3 to 17 m²s^-1 over the temperature range 0 to 40°C, which is quite a big percentage change, so the properties of the strut (depending on the rate the gas passes through the orifice) can be expected to change quite a lot over the range. This, combined with the pressure change, probably explains it.

Just my thoughts.

i doubt if they're nitrogen filled. perhaps fluid filled like a sreen door closer. but it's most likely the grease the use to lubricate it.

Where have you been? Why do you think they are called gas struts? I don't think you'll find any liquid in a screen door closer. It's mostly a spring and a vent valve.

And, gasses are fluids.

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SOURCE: www.msengineering.co.uk

The oil is for lubrication. No springs here.

Buy only gas struts that are manufactured during the winter months, that way you won't have to depend on some low payed yahoo to make the proper temperature corrections during the summer months. DJ

Generally, if a strut is sized correctly, it will work fine winter and summer for a few years, but eventually minor losses of gas cause it to work badly in the winter.

If your strut was in fact over sized for the job, and its also over two years old, I can imagine that it would give EXACTLY the problem you describe.....replace it/them.

Do remember that the thick part must be at the top, or you will be replacing them even more often....