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...it does not hold good for indian weather conditions. if you tell me showgard showgard it will be but if there is something better I can spend the extra few dolalrs I am not buying too many mounts just 10 for these and a few for british indias expensive stamps.
Keep in mind that the primary function/advantage of mounts is for display on paper pages, NOT storage. Mounts are NOT the preferred method for storing valuable extra stamps. For storage of premium items in humid conditions, I strongly suggest considering something like Vario stockpages (manufactured by Lighthouse) or Omnia pages (Lindner). I prefer the double-sided black pages, but if you are concerned about evaluated/checking on the gum, you can get the clear single-sided pages.
Archival is a relative term for which there is no standard. It is more of a sales gimmick more than anything else. The mount is only "archival" under normal "archival" conditions. Also, remember, the stamp itself is NOT archival; it doesn't matter if the mount is truly "archival".
The problem with using mounts for "safe-keeping" in humid conditions is simple -- mounts do a good job of keeping moisture IN but do a bad job of keeping moisture OUT. It is a bad combination. My scanner can't show it and I don't have a camera, but I was going to try to post pics of various moisture damaged stamps taken out of perfectly fine mounts and explain the various causes of the moisture damage. But it's hard to explain/show without pics. Sorry.
Remember, mounts have gum on the backside! Showgard mounts are split in half at the back (as opposed to open-top mounts). In a hot humid environment, you have to be extra careful that the mount gum doesn't reflow over time. You mentioned your stamp gum gets "soft" in your environment. I imagine that is happening to the gum on the mount as well. Since the Showgard mounts are split at the back, all it takes is the slightest reflow or the slightest seepage of moisture along the back to cause a very thin line of gum damage along the middle length of the back of the stamp. Furthermore, if you accidentally trap some moisture into the pinched top/bottom of the mounts, you will get either gum damaged ends or even irreversible "gray/toning of the stamp".
I've visited high humidity locations in Asia many times, and nobody I know uses Showgard/Scott style mounts. I don't think it is an issue of availability. Many collectors I run into over there use the Vario-style stockpages (although they are usually knock-offs, not the genuine Varios). Either that, or they have a "dry room" or "climate controlled" room in which they store moisture sensitive items.
I know you've got a tough situation. Many years ago I took some mint US stamps to a high humidity location in Asia for exchange purposes. Within a few hours, the stamps were stuck fast (and I had kept them vertical and not touching other stamps!!). Ended up bringing them back to the US to use as postage. I strongly recommend getting in touch with dealers and philatelic organizations in India and seeking their advice on how best to long term store valuable stamps.
One of the reasons I prefer collecting used stamps is so I don't have to deal as much with the moisture problem.
Best wishes...

k