TEMTS0425 - Tempil 425F Temperature Indicating Stick

Precision Thermal Monitoring with Tempilstik 425°F

The Tempilstik 425°F (218°C) is the original temperature-indicating stick, setting the industry standard for accuracy, reliability, and simplicity in surface temperature measurement. Designed for critical industrial applications where thermal precision is non-negotiable, this phase-change indicator offers a low-cost, high-value alternative to complex electronic measurement tools. Unlike thermocouples or infrared guns that can be affected by emissivity, angle, or battery life, the Tempilstik relies on the immutable laws of physics: the melting point of its formulated compound is fixed and precise.

Engineered to melt within +/- 1% of its rated temperature, the TS425 provides immediate visual confirmation when the workpiece reaches 425°F. This level of accuracy makes it an essential tool for compliance with stringent welding codes such as AWS D1.1, ASME Section I, III, and VIII, and ANSI/ASME Code B31.1 and B31.3. Each stick is traceable to NIST standards, ensuring that your quality control processes are backed by verifiable data. The product consists of a temperature-sensitive crayon housed in a durable, slip-resistant metal holder, designed to protect the stick from breakage and provide a firm grip even when wearing heavy industrial gloves.

In manufacturing and fabrication environments, maintaining specific temperatures during preheating, interpass, and post-weld heat treatment (PWHT) is vital to prevent cracking, warping, or metallurgical defects. The Tempilstik 425°F eliminates the guesswork. It is particularly valuable in environments where electronic interference might disrupt digital sensors or where equipment calibration logs are difficult to maintain. With a shelf life that is effectively indefinite when stored properly, this tool is always ready for use, providing a fail-safe method for thermal verification in sectors ranging from oil and gas to aerospace and automotive manufacturing.

Using the Tempilstik is straightforward: simply stroke the workpiece during heating. When the mark melts and turns into a liquid smear, the surface has reached the rated temperature. This distinct phase change is easily visible even in low-light conditions often found in workshops. Whether used as a primary measurement tool or a backup verification method, the Tempilstik 425°F remains a cornerstone of effective thermal management strategies.