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Heat Transfer Cement
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Heat Transfer Cement, often called HTM (Heat Transfer Mastic), is a
compound used to enhance the thermal performance of bolt-on heating products. The compound
is applied to the bolt-on jacket and to the component at time of installation. There are
several manufacturers and many formulations of these compounds. In the processing industry
the compounds most widely used consist of a base component of graphite and one or more of
several binder components which are formulated for different applications. Graphite is a
good heat conductor with a thermal conductivity about half the value of aluminum and more
than 100 times greater than air. Graphite-based heat transfer cements fall generally into
one of two types: Drying or Non-Drying. The binder component of the drying types is a
silica compound which causes the cement to become rigid as it dries. It also adheres
tenaciously to applied surfaces. Non-drying types remain plastic, even with the
application of heat. CSI maintains an inventory of both types of the cement.
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ControHeat Thermal Cement, Grade 1.We recommend this drying type of HTM for use with ControHeat Bolt-On Jackets.
It is composed of silica compounds and graphite. The consistency of the material from
freshly opened containers is like a thick paste. The color is black. Before it dries, it
is soluble in water. After it dries, the solubility is very low. It should be stored at
temperatures above freezing. Partially used containers should be sealed
tightly. The
maximum service temperature for Grade 1 is 750 F. Standard put-ups are one-gallon and
one-quart containers. Other put-ups are available on special order. Special grades of the
material are available for higher temperature service. |
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ControHeat Thermal Cement, Grade B This non-drying type of HTM is recommended for use with ControTrace Heating
Elements and Panels. It is composed of a high-temperature petroleum derivative and
graphite. Its maximum service temperature is 400 F. At room temperatures it has the
consistency of heavy grease. It's workability decreases as the ambient temperature goes
down, becoming very stiff near freezing temperatures. The material is not soluble in
water. It will dissolve in light mineral oils. Standard put-ups are one-gallon containers. |
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