OBJECTIVE:
To lay down a procedure for Molybdenum Test.
SCOPE:
This SOP is applicable for Molybdenum Test at {Company Name} {Location}.
RESPONSIBILITY:
Technician- Follow the instruction as per procedure.
Engineering Officer/Executive- Execution as per laid down procedure.
Engineering Head- Technical correction, review, training & monitoring of SOP.
ACCOUNTABILITY:
Engineering Head
Quality Assurance Head
ABOUT MOLYBDENUM TEST:
The molybdenum test is a vital analytical procedure used to identify the presence of molybdenum in stainless steel, specifically to differentiate between SS304 and SS316. SS316’s superior corrosion resistance stems from its molybdenum content. This test involves applying a specialized chemical solution to the steel surface. If molybdenum is present, a distinct color change, often a reddish colour, occurs due to a chemical reaction. This color change serves as a clear indicator of SS316. The test is crucial in industries where material integrity is paramount, such as pharmaceuticals and food processing, ensuring that materials meet stringent specifications and preventing potential corrosion-related failures. This simple yet effective method safeguards product quality and safety in critical applications.
PROCEDURE:
Precautions & General Conditions:
Ensure that there is no rusting on the battery.
Ensure that the test metal is clean, dry and surface free from grease.
Ensure that the 9v battery is charged.
Procedure for Testing SS 316 and SS 304:
Put one drop of solution on the clean and dry metal surface to be tested.
Put 9v (-) ve pole on the chemical drop and (+) ve pole on the surface of material.
Remove 9v current from the chemical drop after observing the color change of the solution.
If the color changes to red color and remains for a long time then the tested metal is SS 316 grade.
If the color changes to red color and disappears immediately, then the tested metal is SS 304 grade.
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REFERENCES:
Not Applicable
ANNEXURES:
ANNEXURE No. | TITLE OF ANNEXURE |
Annexure-I | MOC test for SS 316 and SS 304 |
ENCLOSURES: SOP Training Record
DISTRIBUTION:
Controlled Copy No. 1 | : | Quality Assurance Head |
Controlled Copy No. 2 | : | Engineering Head |
Master Copy | : | Quality Assurance Department |
ABBREVIATIONS:
SOP | : | Standard Operating Procedure |
QA SS MOC | : : : | Quality Assurance Stainless Steel Material of Construction |
REVISION HISTORY:
CHANGE HISTORY LOG
Revision No. | Details of Changes | Reason for Change | Effective Date |
00 | New SOP | Not Applicable | To Be Written Manual |
ANNEXURE-I
MOC TEST FOR SS 316 AND SS 304

Click the link to download word file copy of this document:
https://pharmaguidehub.com/product/sop-for-molybdenum-test/