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Monil 304-316 Identifier
AISI 304-316 Test Pen
Bio Nil
Monil 304-316 Identifier
AISI 304-316 Test Pen
Sensitive to 316 steel. One drop is applied to a clean surface and the colour change is observed. A sequential yellow-green-brown colour change on the tested surface within 5 minutes indicates AISI 316 steel. The metal surface must be clean and at room temperature (15-20°C).
Key Features
- Rapid identification (5 min)
- A single drop is enough
- Sensitive to 316 steel
- Non-destructive test
- Usable in the field
Application Images
The product in application
Inox One, Omni and Monil product page
Technical Properties
Specifications
| Property | Value |
|---|---|
| Form | Pen (drop application) |
| Test time | 5 minutes |
| Steel type detection | AISI 304 / AISI 316 distinction |
| Colour change (316) | Yellow → Green → Brown |
| Surface temperature | 15-20°C (room temperature) |
Material Compatibility
AISI 304AISI 316
Usage Areas
Where is it used?
- Incoming raw material inspection
- Buyer-side quality testing
- Sorting of mixed stock
- On-site inspection
Application Procedure
Step-by-step usage
- 01
The metal surface must be clean and at room temperature
- 02
Apply 1 drop from the pen onto the surface
- 03
Observe the colour change within 5 minutes
- 04
If the sequence Yellow → Green → Brown occurs, it is AISI 316
- 05
If there is no colour change, it is AISI 304 or another grade
Application step01 / 05
01
The metal surface must be clean and at room temperature
- 01
The metal surface must be clean and at room temperature
- 02
Apply 1 drop from the pen onto the surface
- 03
Observe the colour change within 5 minutes
- 04
If the sequence Yellow → Green → Brown occurs, it is AISI 316
- 05
If there is no colour change, it is AISI 304 or another grade
Safety Warnings
- Reactive substance — in case of skin contact, rinse with plenty of water
- Use goggles and gloves
Frequently Asked Questions
About Monil 304-316 Identifier
How are AISI 304 and 316 distinguished with Monil?
One drop is applied to a clean surface and you wait 5 minutes. If a sequential yellow, green and brown colour change occurs, the material is AISI 316. If there is no colour change, it is AISI 304 or another alloy; the molecular sensitivity of the test is based on molybdenum ions.
What does it mean if there is no colour change?
The reagent reacts only to the molybdenum present in 316. If the colour does not change, the material contains no molybdenum, meaning it is AISI 304, 304L or another stainless steel grade. This clearly indicates that the material is not 316.
Is surface cleaning required after the test?
Yes. Once the test is finished, the surface must be rinsed with water or wiped with a damp cloth. If reagent residue remains, it can cause localized corrosion over time; the surface must be cleaned, especially in food and pharmaceutical applications.
At which surface temperatures does it work correctly?
For reliable results, the surface must be at room temperature, 15-20°C. On a hot surface the reagent evaporates too quickly and the colour reaction remains insufficient; on a cold surface the reaction slows down and false negative results may occur.
Can it be used for tests requiring certification?
Monil is a screening tool designed for rapid on-site identification. It does not replace an official material certificate or a 3.1 document; however, it is extremely reliable for incoming raw material inspection, sorting of mixed stock and quality-control screening tests.
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