# MSL classification explained for shipping teams | x25pronto

Canonical: https://x25pronto.ch/en/blog/msl-klassifizierung-einfach-erklart-fur-versandteams.html

VW Tiguan R · 320 PS 4MOTION · discreet · direct

EXPRESS COURIER · DIRECT · MON–SUN

Courier service Switzerland.
Express courier. Direct.
Also overnight.

x25pronto Switzerland takes goods direct to the destination. Small loads go by car. Larger loads go by van or Van XL. Direct, express and overnight trips run Monday to Sunday when a slot is free. Free times are shown in the booking calendar. This keeps the plan clear.

[Calculate price](https://x25pronto.ch/en/#quote)[How overnight works](https://x25pronto.ch/en/overnight.html)

Direct Mon–Sun Overnight Mon–Sun Car & van up to 1,000 kg

COURIER INSIGHTS

# 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.

23 September 2026

## 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.

## Plan a courier trip in Switzerland

x25pronto Switzerland carries small and well packed shipments by car. Businesses can choose a direct courier trip or overnight service. Route, timing and shipment details can be entered online before booking. The guide price is then shown for the planned courier order.

[Direct courier →](https://x25pronto.ch/en/direct-courier.html)[Overnight →](https://x25pronto.ch/en/overnight.html)[Services →](https://x25pronto.ch/en/services.html)[Calculate guide price →](https://x25pronto.ch/en/#quote)

### At a glance: MSL classification explained for shipping teams

Key points from this article. Follow the links to read each explanation.

What is MSL? MSL stands for Moisture Sensitivity Level. [Read this section](https://x25pronto.ch/en/blog/msl-klassifizierung-einfach-erklart-fur-versandteams.html#courier-article-step-1)

MSL levels in short MSL 1 is low sensitivity and needs no special handling. [Read this section](https://x25pronto.ch/en/blog/msl-klassifizierung-einfach-erklart-fur-versandteams.html#courier-article-step-2)

Labeling and paperwork to check At goods receipt, check manufacturer data sheets and packaging for the MSL level, floor life and part codes. [Read this section](https://x25pronto.ch/en/blog/msl-klassifizierung-einfach-erklart-fur-versandteams.html#courier-article-step-3)

Storage and packaging for shipping Use moisture barrier bags (MBB), desiccant (silica gel) and moisture indicator cards (MMI) for moisture‑sensitive parts. [Read this section](https://x25pronto.ch/en/blog/msl-klassifizierung-einfach-erklart-fur-versandteams.html#courier-article-step-4)

Simple checklist for shipping teams Use MBB + silica gel + MMI for vulnerable parts. [Read this section](https://x25pronto.ch/en/blog/msl-klassifizierung-einfach-erklart-fur-versandteams.html#courier-article-step-6)

More on this topic These guides cover related questions: [Incoterms for urgent couriers: DDP vs DAP explained](https://x25pronto.ch/en/blog/incoterms-bei-eiligen-kurierdiensten-ddp-vs-dap-einfach-erklart.html) · [Insurance terms explained: what courier partners must know](https://x25pronto.ch/en/blog/versicherungsbegriffe-einfach-erklart-was-kurierpartner-wissen-mussen.html)