BOLEX H16 SBM Instruction Manual page 45

Precautions against cold and sand.
If you are going to film at high altitudes
or in very cold climates, send your camera to the Bolex agent for special
greasing and winterizing.
Guard against getting sand or dust in your camera, which could scratch or damage
its mechanism. Where necessary, put the camera in its case between each take
and, for extra protection, put the case in a plastic bag.
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Special care of the camera in tropical regions.
Various precautions should
be taken to protect both camera and film against heat and humidity.
Airtight boxes are available to store films in the tropics. Never leave film in the
camera longer than the time necessary to expose it.
The camera and all accessories should be cleaned regularly and thoroughly.
Leather and the carrying cases should be treated with special product available from
leather merchants.
To prevent hot, moist air from condensing and aiding the formation of bacterial
growths, do not place your equipment in its cases between takes, but leave it
freely exposed to the air.
However, for storing your equipment, especially during the monsoon season, use
airtight tin boxes with a silica gel or calcium chloride humidity absorber. Avoid
using these chemicals too liberally, however, to prevent excessive drying, which
might damage leather and film. A relative humidity of 35 to 40
%
is satisfactory.
Care should be taken to prevent any of the chemical coming into contact with
your equipment.