Martin Larsen wrote:
> "Glenn Møller-Holst" <glenn@x.dk> skrev i en meddelelse news:db62l3$rph$1@news.net.uni-c.dk...
>
>
>>Stort set alt skumgummi mørner indenfor max. 25 år.
>
>
> Jeg kan sagtens skaffe gamle prøver med smidigt skumgummi.
> Det må have noget at gøre med kvaliteten. Og så er der jo også
> nogen der har interesse i indbygget forældelse, desværre.
>
> Mvh
> Martin
Hej Martin og andre interesserede
Her er masser af kilder og relaterede problemer:
Jeg har ikke kunnet finde nogen "kur".
Jeg har søgt på:
http://www.google.com/ med forskellige kombinationer af
disse ord:
"foam rubber", disintegration, crumble, deteriorate, sticky, goo, gooey,
crud.
Her er nogle af resultaterne:
http://www.nicodemus.org/fursuit.cgi?materials-foam
"...
Polyurethane foams will deteriorate with age. This is simply due to
exposure to air and ultra-violet light; it's not a process that can be
easily stopped. Because of this, expect that items made from foam will
start to lose their rubbery flexibility after two or three years. The
foam will still be usable for quite a while beyond that before it begins
to lose structural strength.
..."
http://www.carpets.org/howtobuy.htm#anchor4
"...
*Urethane Foam - A lightweight pad that provides a degree of firmness,
moth and vermin proof, mold & mildew resistant, odor free and resistant
to normal cleaning agents. Being unaffected by moisture, it is suitable
for use in basements.
*Foam Rubber - A medium weight pad resilient, mold & mildew resistant,
insect proof and non-allergenic. This type can also be used in basements
because it is not affected by moisture.
..."
http://people.smu.edu/rmonagha/mf/bags.html
"...
Avoid upholstery foam materials, which can outgas harmful chemical
vapors and frequently crumble into gooey crud in a surprisingly short
time. Look for the more durable charcoal grey Ethafoam or similar
non-outgassing foams. Many computer makers use this foam to mail out
their products, among other low cost sources.
..."
How to replace the deteriorating foam on your camera.
http://people.smu.edu/rmonagha/bronfoam.html
"...
The foam is in their "Restoration Supplies" section:
http://www.micro-tools.com/cgi-bin/shop.pl/page=restore.htm
...
Subject: Re: Cleaning sticky foam
...
There is a product called "Goo Gone" made by Magic American Corp.,
Cleveland, OH 44122, 1.800.321.6330.
...
Foam for Olympus cameras is sold by
http://www.zuiko.com
for just $6 per kit. You could probably use it with other cameras too,
especially if they're smaller than Olympus SLRs.
...
Subject: Re: Mirror foam replacement
...
A better choice would be either a thin slice of the open cell (porous)
material from a foam paintbrush (as suggested by Rick Housh), or the
polyurethane foam sold as air conditioner filter by Frost King. To cut
these materials, compress them with a metal straightedge and then slice
with a razor. To remove the old foam goo, acetone works well - but be
sure to remove your F's focussing screen first!
...
Subject: Re: Source for Camera Bag insert material.
Go to a camping supply shot and get some sleeping pad material for
padding. Closed cell foam, not open cell urethane. No outgassing and no
tendency to pick up water.
..."
http://www.photo.net/nikon/f3
"... I've only today noticed that the foam rubber seal on the camera
back is starting to deteriorate. (No surprise, as the foam rubber
inserts in my camera bag, purchased at the same time, have completely
deteriorated into uselessness)...."
http://www.sundial.net/~rogerr/lsd1.htm
"...Surrounds can be replaced with new polyether ones that will not
deteriorate like the original polyurethane surrounds. Some early 8" mids
had coated cloth surrounds, which did not deteriorate and do not need to
be replaced...."
http://aic.stanford.edu/treasure/objects.html
"...Do not use bubble wrap, rubber, polyurethane foam rubber, newspaper,
or excelsior to wrap or pack objects. Safe polyethylene foams are
available through conservation suppliers...."
mvh/Glenn