ColourTherm CT / CTIP180 / PL368 / 650 range thermochromic temperature-indicating and high-temperature marking paints

Country: United Kingdom · Model: ColourTherm CT, CTIP180, PL368, 650 Range

ColourTherm thermochromic indicator paints that change color at a set temperature from 80 to 440 °C, and marking paints for heat-resistant steels. Irreversible paints record the temperature history of a part and reveal hot spots and failure of internal insulation. They are used in chemical, petrochemical and aviation equipment.

ColourTherm irreversible: CT-80, CT-115-Rev1, CT-140, CT-150, CT-160, CT-165-R1, CT-IP180, CT-225, CT-400, CT-410, CT-440; first color change 80–440 °C, subsequent up to 560 °C
Principle: chemical change of solid components when heated for ≥ 10 min; irreversible
Thinner: CT-8590Xl
CTIP180: temperature-indicating paint for refinery reactors

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Technical specifications

Customs codes (for reference)
ColourTherm irreversible	CT-80, CT-115-Rev1, CT-140, CT-150, CT-160, CT-165-R1, CT-IP180, CT-225, CT-400, CT-410, CT-440; first color change 80–440 °C, subsequent up to 560 °C
Principle	chemical change of solid components when heated for ≥ 10 min; irreversible
Thinner	CT-8590Xl
CTIP180	temperature-indicating paint for refinery reactors
Reversible	ColourTherm low-temperature reversible
PL368	heating and corrosion identification paint up to 600 °C
650 Range	inorganic marking paints for heat-resistant steels (IP9091, PL149–PL168-R1); PL155R1 close to Fed Std 595 22510; PL111-R1, yellow silicone-epoxy-melamine
NSN (NATO Stock Number)	8010-99-834-4616 (per the manufacturer's document, to be confirmed by packaging)

Specifications are taken from the manufacturer’s technical documentation. Updated 11/10/2026. Customs codes are for reference only; the final code is determined at customs declaration for the specific model.

Description

Irreversible paints work through a chemical change of solid components. Heating for about 10 minutes to the set temperature or above changes the color permanently, and with prolonged heating the transition is possible at a somewhat lower temperature. Before the first transition the paints are thermally stable. The range includes the CT-80 (80, 240, 295 °C), CT-115-Rev1 (115, 145, 300), CT-140 (140, 316, 360), CT-150 (150, 240, 310), CT-160 (160, 190, 250), CT-165-R1 (165, 180, 205), CT-IP180 (180, 310), CT-225 (225, 235, 285), CT-400 (400, 520, 560), CT-410 (410, 440, 560) and CT-440 (440). The thinner is CT-8590Xl. The CTIP180 with transitions at 180 and 300 °C is often taken for refinery reactors. There is also a reversible low-temperature paint. The PL368 identifies heating and corrosion up to 600 °C. The inorganic marking paints of the 650 series (IP9091, PL149, PL150, PL151-R1, PL152-R1, PL153, PL155-R1, PL167-R1, PL168-R1) are intended for heat-resistant steels, and the PL155R1 is close to Fed Std 595 22510. The PL111-R1 is a yellow silicone-epoxy-melamine.

How to choose

First determine the temperature of the first transition. For low temperatures take the CT-80 or CT-115-Rev1, for 180 °C on reactors the CTIP180, for the highest the CT-400, CT-410 or CT-440. If what is needed is not heat tracking but marking of parts made of heat-resistant steels, see the 650 series or PL111-R1. Heating together with corrosion up to 600 °C is tracked by the PL368.

Request a price and lead time

ColourTherm CT / CTIP180 / PL368 / 650 range thermochromic temperature-indicating and high-temperature marking paints. We reply within one business day.