Kihlstrom Temperature Indicator [top]

Named after the innovator behind the technology (closely related to the broader "Tempilstik" and "Thermopaper" families of products), the Kihlstrom indicator is typically a small, white, paper-like sticker containing a heat-sensitive element. When exposed to its calibrated temperature, the element permanently changes color—usually from white or off-white to a distinct black, blue, or green.

At room temperature, the crystal structure of the compound scatters light in a way that appears opaque white. As the indicator heats up and approaches its melting point (the rated temperature), two things happen: kihlstrom temperature indicator

The Kihlstrom Indicator operates on a , refined through proprietary metallurgy. Two dissimilar metals—typically an invar alloy (low expansion) and a manganese-chromium steel (high expansion)—are helically wound and hermetically sealed. As temperature changes, the differential expansion rotates a central shaft, directly driving a pointer across a calibrated dial. Named after the innovator behind the technology (closely