Tempilaq® Advanced 375°F / 191°C
Liquid Temperature Indicator
Brush onto metal surface — changes colour when temperature is reached at 375°F (191°C). Suitable for curved surfaces and blind angles inaccessible to a crayon. 2 oz. Accuracy ±1%°F.
* Images are illustrative
Tempilaq® Advanced 375°F / 191°C
Liquid temperature indicator — brush on evenly, wide coverage, precise colour-change
Product Description
Tempilaq® Advanced 375°F — Liquid form, applications & standards
Brush onto steel surface before preheat or interpass temperature verification. Liquid penetrates evenly — suitable for curved surfaces, blind angles and pipe welds. 2oz bottle — compact and easy to carry on site.
After application the solvent evaporates quickly (quick-dry), leaving a thin film on the steel. When the temperature reaches 375°F (191°C), the film changes colour clearly — a visual result recordable by photo for QA/QC records. Thinner (Part #24597) may be used for dilution if needed.
Compare with Tempilstik®
When should Tempilaq® be used instead of a crayon?
Tempilaq® Advanced vs Tempilstik® — Choosing the right tool
- Curved surfaces, small-diameter pipe
- Blind angles, hard to reach by hand
- Wide, uniform surface coverage needed
- Verify uniform heat distribution in PWHT furnace
- Surfaces with ridges, grooves or complex profiles
- Flat, easily accessible surfaces
- Quick spot-check at a specific point
- Outdoor / windy site conditions
- Immediate reading needed, no drying wait
- Multiple temperature levels required simultaneously
Technical Knowledge
Standards and application context
📐 Applicable Standard
AWS D1.1, ASME B31.3 — preheat and interpass control for structural steel and pressure piping.
Carbon steel, low-alloy, API 5L. Curved surfaces, blind angles, small-diameter pipe.
What is Interpass Temperature? tempil.vn🖌️ Correct application technique
Application procedure and reading results
Shake the bottle well. Apply a thin, even coat on clean steel (free of oil and grease). Allow the solvent to evaporate fully (30–60 s depending on conditions). Heat the surface — when it reaches 375°F (191°C) the film changes colour clearly. Photograph before the surface cools. If Tempilaq® thickens from evaporation, use Thinner Part #24597 to restore viscosity.
Features
Key Advantages
- Liquid form — applicable to curved surfaces, blind angles and small-bore pipe that a crayon cannot reach
- Precise colour change at 375°F (191°C) — accuracy ±1%°F
- Quick-dry — solvent evaporates fast after application; ready to heat within 1–2 minutes
- Uniform wide-area coverage — ideal for verifying heat distribution across large pressure vessels
- No power source, no calibration required — ready to use immediately
- Visual result (colour change), recordable by photo for QA/QC documentation
- 2 oz (59 ml) bottle — compact, easy to carry on site, suited for spot-checks
- Made in USA — C/O, Certificate of Quality, full export documentation
Part Number Table
Nearby Temperature Grades
| Part # | °F | °C | Size | Applications |
|---|---|---|---|---|
| 24405 | 300°F | 149°C | 2 oz (59ml) | Preheat/Interpass — piping, curved surfaces |
| 24407 | 325°F | 163°C | 2 oz (59ml) | Preheat/Interpass — piping, curved surfaces |
| 24408 | 350°F | 177°C | 2 oz (59ml) | Preheat/Interpass — piping, curved surfaces |
| 24410 ★ | 375°F | 191°C | 2 oz (59ml) | Preheat/Interpass — piping, curved surfaces · This page |
| 24411 | 400°F | 204°C | 2 oz (59ml) | Preheat/Interpass — piping, curved surfaces |
| 24413 | 450°F | 232°C | 2 oz (59ml) | PWHT stress relief, uniform heat verification |
| 24414 | 475°F | 246°C | 2 oz (59ml) | PWHT stress relief, uniform heat verification |
Applications
Industries That Use It Tempilaq® Advanced
(Pipeline)
(Pressure vessel)
(Heat treatment)
(Shipbuilding)
(Refinery)
(PTSC, PVN)
FAQ
Frequently Asked Questions
❓ Usage
Can Tempilaq® 375°F be used outdoors?
Yes, but avoid strong wind during application so the film dries evenly. In high-ambient-temperature conditions (>40°C / 104°F), the solvent evaporates faster — apply immediately before heating. In high-wind offshore conditions, a Tempilstik® crayon is usually more practical for quick spot-checks.
❓ Storage
How should Tempilaq® be stored?
Seal tightly after every use — the solvent evaporates and thickens Tempilaq® if left open. Store in a cool, ventilated place away from heat and direct sunlight. If too thick, use Thinner Part #24597 to restore original viscosity.
Related Products
See Also
Tempilaq® Advanced 375°F
Liquid bottle, brush onto curved surfaces and blind angles. Contact us for a quote with Technical Data Sheet.
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