The devil is in the details: minor PCB contamination, major reliability risks

In contract electronics manufacturing (EMS – Electronics Manufacturing Services), it’s easy to focus on the big things: advanced SMT lines, high-end components, or fast order fulfillment. But the reliability of the final device often depends on what you don’t see—such as the cleanliness of the PCB surface before soldering.

At first glance, a PCB may look perfect. But even a microscopic layer of grease, dust, flux residue, or moisture can cause serious issues during assembly: cold solder joints, micro shorts, unstable connections, or accelerated corrosion. These defects rarely show up immediately. More often, they become apparent after weeks of device use—typically at the worst possible time.

A small error in the SMT assembly process can lead to serious business consequences: product returns, complaints, loss of trust in the electronics manufacturer, or downtime for your client. This is a risk no company wants to take—especially in B2B electronics manufacturing, where repeatability, quality, and on-time delivery are critical.

A professional EMS provider implements rigorous procedures to ensure PCB surface cleanliness throughout every stage of production. Chemical or ultrasonic cleaning, ROSE testing, visual and AOI inspections, and operating in contamination-free environments are not extras—they are the standard for a responsible contract electronics manufacturer. Proper storage conditions, use of gloves, ESD-safe clothing, and well-trained personnel are just as important.

When choosing a partner for electronics manufacturing, it’s worth asking a few essential questions:
– How do you ensure PCB cleanliness?
– What does your quality control in PCB assembly look like?
– Do you follow IPC-A-610 standards?

It’s often these invisible details that reveal the true quality of an EMS provider’s services.

At Elhurt EMS, we know that the devil is in the details. We work in a controlled environment, use proven technologies, and continuously monitor our processes. This is how we deliver reliable, durable, and high-quality electronic devices, built to the highest standards of contract electronics manufacturing.