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Proven to be the best heating mediums
The specially formulated heat transfer fluids developed by BPI have been proven
to be the best heating mediums available. They heat quickly and evenly, maintain
the high temperatures needed for your tints, and are non-toxic. They help
preserve the interior of your base tank and protect your heating element as
their evaporation factor is almost nil. It is unwise to make any substitutions,
which may corrode, evaporate quickly, or release toxic vapors.
In recent advertisements, some manufacturers are claiming that using water as a
heat transfer medium is the best way to heat tints in a tinting system.
This is not so, and needs to be addressed so that proper lens coloring can be
achieved, and proper health and safety can be maintained in the optical
laboratory.
To be effective, the heat transfer fluid temperature should be higher than the
tint solution inside the tint tank. Tests conducted at BPI® have shown that as
the tint solution nears boiling, the temperature differential between the
heating fluid and the tint tank should be optimized at near 40°F. (To maintain a
205°F tint tank). This differential requires the heat transfer solution to be
maintained at about 245°F. This temperature differential cannot be achieved
using water open to atmospheric pressure as a heat transfer medium. The maximum
temperature of water at boil is 212°F (100°C), thus making it difficult to
achieve the proper tint tank temperature to assure proper color, fade
resistance, and color stability.
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