Markal Tempilstik Temperature Indicating Crayon
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1 Day delivery all over UAENov 02 - Nov 06
The industry standard for weld preheat, interpass and post-weld heat treatment verification for over 80 years. Mark the surface — the crayon melts the instant it hits its rated temperature, giving instant, calibration-free confirmation. 100–650°F, ±1% NIST-traceable, AWS D1.1 & ASME compliant. Supplied across the UAE, Saudi Arabia and Qatar, including fabrication and pipeline welding work in Sharjah, Dammam and Doha.
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Product Overview
What It Is
The Tempilstik is the original temperature-indicating crayon — a stick calibrated to melt at one precise temperature. Streak it across a heated surface: below the rating the mark stays dry and chalky; the moment the surface reaches the rated temperature the mark melts into a clear liquid smear. This gives an instant, calibration-free, ±1% NIST-traceable confirmation that the target temperature has been reached. Trusted on the most critical jobs for over 80 years.
Who Uses It
Welders, welding inspectors (CSWIP/AWS-CWI), QA/QC engineers, and heat-treatment technicians on structural, pipeline, pressure vessel and fabrication projects. Mandatory on any weld with a specified preheat or interpass temperature in the WPS.
Where It Is Used
Weld preheat verification before striking an arc, interpass temperature control between weld passes, and post-weld heat treatment (PWHT) monitoring — across oil & gas, pipeline, petrochemical, structural steel, shipbuilding and power projects throughout the GCC. Also for bearing fitting, curing, drying, and any process needing surface temperature confirmation.
Code Compliance — Why Inspectors Insist on Tempilstik
Welding codes mandate a minimum preheat and maximum interpass temperature to prevent hydrogen-induced cracking and control weld metallurgy. Tempilstik complies with the preheat temperature requirements of AWS D1.1, ASME Code Sec. I, III and VIII, and ANSI/ASME B31.1 and B31.3. The part number, temperature and lot code are imprinted across the entire stick for full inspection traceability — and the crayons are free of sulphur, lead and halogen, so they are safe on stainless steel and nickel alloys.
How to Use a Tempilstik
Select the Right Temperature
Choose the Tempilstik rated at your required preheat or interpass temperature (per your WPS). Each stick is a single fixed temperature.
Mark the Surface
As the surface heats, streak the crayon on the metal near (but not in) the weld zone. Below the rated temperature the mark is dry and chalky.
Watch for the Melt
The instant the surface reaches the stick's rated temperature, the mark melts into a distinct liquid smear — your visual "go" signal that temperature is reached.
Verify & Weld
Confirm melt across the required area, then proceed with welding. For interpass control, check between passes that the surface has NOT exceeded the maximum interpass stick.
Temperature Range & Common Ratings
Common Preheat / Interpass Temperature Ratings (Full Range 100–650°F)
| °F | °C (approx.) | Typical Application |
|---|---|---|
| 100°F | 38°C | Low-temp drying / minimum preheat |
| 150°F | 66°C | Light preheat, thin section |
| 175°F | 79°C | Common minimum preheat |
| 200°F | 93°C | Standard structural preheat |
| 250°F | 121°C | Preheat — medium section |
| 300°F | 149°C | Preheat — heavy section / higher CE steel |
| 350°F | 177°C | Preheat — thick / high-strength steel |
| 400°F | 204°C | Preheat / interpass control |
| 450°F | 232°C | Interpass max control |
| 500°F | 260°C | Interpass / high-preheat alloy |
| 550°F | 288°C | High preheat / PWHT approach |
| 600°F | 316°C | Interpass max / heat treatment |
| 650°F | 343°C | Upper standard range / PWHT |
Additional temperatures below 100°F and above 650°F are available. Confirm the exact rating required by your WPS. Contact us with your temperatures and we'll supply the matching sticks.
- 100–650°F (38–343°C)
- ±1% NIST-Traceable
- Calibration-Free
- AWS D1.1 Compliant
- ASME Sec. I/III/VIII
- B31.1 & B31.3
- Sulphur/Lead/Halogen Free
- Made in USA
Key Features & Benefits
±1% NIST-Traceable Accuracy
Precise, calibration-free temperature indication with 100% reliability — no meters to calibrate, no batteries, no drift. The melt point is the measurement. Trusted by inspectors as objective evidence of temperature compliance.
Code Compliant & Traceable
Meets AWS D1.1, ASME Sec. I/III/VIII, and ANSI/ASME B31.1/B31.3 preheat requirements. Part number, temperature and lot code imprinted across the entire stick — full traceability for QA/QC documentation and audits.
Instant Visual Result
The mark melts the moment the surface hits the rated temperature — an immediate, unambiguous go/no-go signal. No waiting, no interpretation. Faster and cheaper than contact thermometers for spot checks.
Sulphur, Lead & Halogen Free
Free of contaminants that cause cracking or corrosion in stainless steel and nickel alloys — safe to use directly near the weld zone on corrosion-resistant alloys and critical service pipework.
Slip-Resistant Aluminium Holder
The crayon is supplied in a slip-resistant aluminium holder for safe, controlled handling near hot surfaces — advancing the stick as it wears, like a mechanical pencil.
Works on Almost Any Surface
Usable on steel, iron, aluminium, stainless steel, glass, plastic and ceramic — one tool across welding, bearing fitting, curing, drying and general surface temperature checks in any industry.
Applications by Industry
| Application | Detail |
|---|---|
| Oil & Gas — Pipeline Welding | Preheat and interpass verification on pipeline and process pipe welding to API 1104 / ASME B31.3, mandatory on ADNOC (UAE), Aramco (Saudi Arabia) and QatarEnergy (Qatar) projects |
| Structural Steel | AWS D1.1 preheat confirmation on structural welding for buildings, bridges and industrial structures across the GCC |
| Pressure Vessels & Boilers | ASME Section I/VIII preheat and interpass control on pressure vessel, heat exchanger and boiler fabrication in petrochemical and power projects |
| Post-Weld Heat Treatment | Monitoring approach and hold temperatures during PWHT of welded joints on critical service pipework and vessels |
| Shipbuilding & Offshore | Preheat verification on hull, structural and piping welds in shipyards and offshore module fabrication across UAE, Saudi Arabia and Qatar |
| Maintenance & General | Bearing and gear fitting temperature checks, drying/curing verification, and general surface temperature confirmation in plant maintenance |
Frequently Asked Questions
What is a Tempilstik and how does it work?
A Tempilstik is a temperature-indicating crayon calibrated to a single precise temperature. You mark the surface as it heats — below the rated temperature the mark stays dry and chalky; the instant the surface reaches the stick's rated temperature the mark melts into a distinct liquid smear. This gives an immediate, calibration-free confirmation that the target temperature has been reached, accurate to ±1% NIST-traceable.
Why are Tempilstiks used in welding preheat and interpass control?
Welding codes require a minimum preheat and a maximum interpass temperature to prevent hydrogen cracking and control weld metallurgy. Tempilstik lets the welder confirm the metal reached the required preheat before striking an arc, and stays below the maximum interpass between passes. It complies with AWS D1.1, ASME Sec. I/III/VIII and ANSI/ASME B31.1/B31.3 — the standard tool for code-compliant welding across oil & gas, structural and pressure vessel work.
What temperature range and accuracy do Tempilstiks offer?
Standard range is 100°F to 650°F (38°C to 343°C), with higher and lower ratings available. Accuracy is ±1%, NIST-traceable — calibration-free with 100% reliability. Part number, temperature and lot code are imprinted across the entire stick for traceability, and the crayons are free of sulphur, lead and halogen contaminants.
What surfaces can Tempilstik be used on?
Steel, iron, aluminium, stainless steel, glass, plastic and ceramic. It ships in a slip-resistant aluminium holder for safe handling near hot work. Being free of sulphur, lead and halogens, it is safe on stainless steel and nickel alloys where these contaminants must be avoided.
How do I get a price for Markal Tempilstik crayons?
Send us the models, sizes and quantities you need on WhatsApp +971 55 697 6535 and we will reply with pricing, availability and delivery time.
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Markal Tempilstik Supplier in the UAE & GCC
Global Hardware & Tools LLC is a supplier, with head office in Abu Dhabi, of Markal Tempilstik temperature-indicating crayons for projects across the UAE, Saudi Arabia and Qatar, including delivery to Sharjah, Dammam and Doha. From our UAE procurement hub we also supply Kuwait, Oman, the wider MENA region and Africa, including Nigeria. For pricing and availability, WhatsApp +971 55 697 6535.