Installation Manual
11
Figure 7-10. An enclosure attached to the leg base of a
CM110 tripod.
8. Resistance to Weathering / Ageing
Regardless of the product range or the manufacturer, it is known that hot
compression moulded GRP is subject to erosion when used outdoors. Due to the
combined action of rain, wind and UV rays, the polyester matrix is superficially
eroded and glass fibres may become apparent. However, the depth of this erosion
is only 7µm.
This slight erosion is unavoidable unless a surface coating (e.g. varnish) is applied
(which brings with it additional problems such as adhesion). It is important to note
that
any erosion is very superficial
and has no effect on the physical
characteristics (electrical, mechanical or chemical) of the polyester.
Enclosures of the type supplied by Campbell Scientific have been successfully
used outdoors since 1958 and tests on field samples support laboratory results.
These enclosures are maintenance free.
If you wish to remove the appearance of any small surface scratches or scuffs
simply apply petroleum jelly (e.g. Vaseline) or oil to the surface and rub lightly.
Similarly any slight surface erosion due to weathering can be restored to its
original appearance by gently rubbing with fine sandpaper before applying
petroleum jelly.
