US Main Number 847-998-8580  |  sales@hallcrest.com
UK Main Number +44 (0)1244817107  |  salesuk@hallcrest.com  

Thermochromic Technology

Thermochromic (TC) Products predominantly change color in response to temperature fluctuations. There are two primary types of TC; liquid crystals and leuco dyes. The most famous TC application ever, the "mood" ring of the 1970’s, was a liquid crystal. Today, liquid crystals are used in many products, including forehead thermometers, room and refrigeration thermometers and other applications including food quality indicators. While liquid crystal TCs are extremely capable materials, they are difficult to work with and require highly specialized manufacturing techniques. The other type of TC is called a leuco dye and is commonly used in manufacturing and control process, advertising, consumer packaging, product labels, security printing, novelty applications such as temperature sensitive plastics and mugs, promotional items,toys and textiles. Thermochromic permanent change ink is a high temperature activated, permanent change pigment used in metalworking,annealing, welding and riveting for quality purposes. 

Chart displays types of thermochromic dyes and inks

Liquid Crystal

Liquid Crystals are generally used for higher precision applications since the temperature response point can be tightly engineered. Forehead Thermometers, medical devices and game pieces are just a few of the more common applications

Color coded thermometer with numbered gauge


Thermochromic Leuco Dye

Leuco dyes are less precise and easier to work with. They are commonly used for packaging, product labeling/graphics, toys, and quality / process control applications.

Two beer bottles

 

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LCR Hallcrest LLC - US

1911 Pickwick Lane - Glenview, IL 60026
847.998.8580
sales@hallcrest.com
customerservice@hallcrest.com
info@hallcrest.com

LCR Hallcrest Ltd – UK

Riverside Buildings
Dock Road
Connah's Quay
Flintshire
CH5 4DS
+44 (0) 1244 817107
salesuk@hallcrest.com

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