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MSL classification explained for shipping teams
Quick guide: What MSL (Moisture Sensitivity Level) means, how to label, store and pack parts so they arrive undamaged and ready for reflow.
Quick answer
MSL (Moisture Sensitivity Level) indicates how vulnerable an electronic component is to moisture during soldering. Shipping teams must identify MSL levels, label parts, use proper packaging and track open storage times to avoid moisture damage during transport and at the customer's site.
What is MSL?
MSL stands for Moisture Sensitivity Level. It classifies electronic components by their sensitivity to moisture during solder reflow. Higher MSL numbers mean stricter storage and handling rules to prevent moisture‑related failures.
MSL levels in short
MSL levels commonly run from 1 to 6. MSL 1 is low sensitivity and needs no special handling. MSL 2–5 set maximum floor life after opening and often require dry packaging or baking before reflow. MSL 6 denotes very high sensitivity and specific manufacturer instructions.
Labeling and paperwork to check
At goods receipt, check manufacturer data sheets and packaging for the MSL level, floor life and part codes. Add internal labels with receipt date, opening date and remaining floor life so shipping and receiving teams know the status.
Storage and packaging for shipping
Use moisture barrier bags (MBB), desiccant (silica gel) and moisture indicator cards (MMI) for moisture‑sensitive parts. Store batches in a dry cabinet when possible. Pack shipments to avoid extra moisture uptake and to protect against shocks.
Handling before shipping and at delivery
Mark the opening date on original packaging. If floor life is exceeded, arrange baking per the manufacturer before further processing or shipping. Inform the recipient about the MSL level, remaining floor life and any required baking or storage conditions.
Simple checklist for shipping teams
1) Record MSL at goods receipt. 2) Use MBB + silica gel + MMI for vulnerable parts. 3) Mark opening date and remaining floor life. 4) Use dry storage for critical levels. 5) Note MSL info on the packing slip. 6) Schedule baking if required and log it.
Frequently asked questions
How do I find a part's MSL?
Check the manufacturer data sheet or packaging. If not listed, ask your supplier or verify the part number against the manufacturer's documentation.
When should I use a moisture barrier bag?
Use a moisture barrier bag for parts rated MSL 2 or higher to limit moisture ingress during storage and transport.
What triggers the need for baking?
Baking is required when the open floor life has been exceeded or when components have absorbed moisture. Follow manufacturer guidelines for temperature and duration.
What should I put on the packing slip?
Include MSL level, opening date, remaining floor life, storage requirements and whether baking was performed or is needed at the recipient.