Apr27
Using Limit Golden Samples to Manage Non-Quantifiable Quality Standards

post on April 27, 2026

With today’s advanced imaging, it’s recommended to document hard-to-quantify quality criteria with photos and include them in the spec. This reduces the need for limit samples, which are difficult to preserve.

In business transactions, both buyers and sellers usually agree on a product specification and acceptance criteria for the items being purchased. These criteria may include things like full functionality, dimensions within tolerance, intact packaging, and no defects in color or appearance. However, some acceptance criteria are hard—or even impossible—to quantify. Examples include sink marks on plastic parts, gloss or color tone after painting, or appearance issues that are judged mainly by visual feel. So how should these be defined?

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Process, Quality     WorkingBear    Views (122)     comment (0)

Apr22
How to Define Cosmetic Quality Standards for Plastic Parts

post on April 22, 2026
How to Define Cosmetic Quality Standards for Plastic Parts
Caption: Cosmetic scratches on plastic parts

Before products are put into inventory after final assembly, electronics manufacturing factories always perform quality inspections to ensure product quality. In terms of functional performance, most products go through 100% function testing, so pass/fail decisions are usually very clear—unless there are intermittent functional issues. In those cases, it’s still relatively easy to identify good versus bad units. Cosmetic (appearance) judgments, however, are a very different story. Disputes happen all the time. How does your company deal with these situations?

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Plastic, Process, Quality     WorkingBear    Views (225)     comment (0)
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Apr15
Common Ways to Connect FPC to PCB: What Actually Works

post on April 15, 2026

Common Ways to Connect FPC to PCB: What Actually Works

As electronics keep getting smaller and more advanced, the need to connect flexible printed circuits (FPCs) to rigid PCBs continues to grow. In this article, Workingbear will walk you through the most common methods used in the industry today—and share some practical insights from real-world experience.

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Design, PCB/FPC/PTF, Soldering     WorkingBear    Views (497)     comment (0)

Apr08
How I Troubleshoot Hidden Open Circuits in FPCs

post on April 8, 2026

How I Troubleshoot Hidden Open Circuits in FPCs

Flexible printed circuits (FPCs) are widely used because they can bend and fold. They’re perfect for compact products or for connecting signals between different PCBAs. But there’s a downside. As usage increases—especially in applications with repeated motion—FPCs can develop open circuits or intermittent connections over time.

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PCB/FPC/PTF, Quality, Uncategorized     WorkingBear    Views (255)     comment (0)

Apr02
Root Cause Analysis: Why FPC Traces Break

post on April 2, 2026

FPC-open-circuit-failure-analysis&solutions800x436.png

Recently, my company started seeing an increase in field returns caused by open circuits in flexible printed circuits (FPCs) inside the terminal. After digging into several cases, the root cause turned out to be broken copper traces. So what’s going on?

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Case study, PCB/FPC/PTF, Process, Quality, Reliability     WorkingBear    Views (545)     comment (0)