Why Do custom made rubber parts Have Defect Issues?

Customers get very angry when they receive defective products. Line stoppages cause huge economic losses. As responsible custom rubber parts manufacturers, the factory solved this problem quickly. I am recording this real improvement case today.

The customer found defective waterproof silicone rings during incoming inspection. The factory immediately arranged full inspection and replacement. This ensured the customer's production line ran normally. We successfully controlled the spread of defective products.

The factory handled the crisis very fast. They strictly followed the standard report process defined by ASQ (American Society for Quality). Let us look at the specific investigation and resolution steps next.

What Are the Specific Customer Complaint Details?

Finding the problem is the first step to solving it. The customer has very strict quality requirements. The factory launched an emergency response mechanism immediately. I carefully reviewed the factory's complaint record.

The customer inspected a batch of 1000 products. They sampled 80 pieces for appearance. They found 7 pieces with burrs and damage. The defect rate reached 8.75%. The factory communicated with the customer immediately to sort and isolate the parts.

Deep Analysis of Temporary Containment Actions

The factory must stop the bleeding immediately. This is a very critical step. I remember a similar incident in 2015 when slow action caused a customer line stoppage. The factory did a great job this time. The customer had 1000 products on hand. The factory sales staff communicated with the customer quickly. They immediately conducted a 100% full inspection and sorting at the customer's site. The customer continued to use the selected good products. All defective products were returned to the factory's DB (database/warehouse). The factory exchanged them with brand-new good products. At the same time, the factory conducted a thorough internal inventory check. The current number of work-in-process is 0 pieces. The number of products in transit is also 0 pieces. The inventory quantity is 0 pieces too. This is very good news. It means the defective products did not continue to be produced or spread within the factory. This rapid temporary handling bought valuable time for the subsequent root cause investigation. You can refer to the international ISO 9001 Quality Management System standards on nonconforming product control to understand the importance of physical isolation. We also updated our internal quality records.

Why Do custom made rubber parts Have Burrs?

If we cannot find the real root cause, the problem will happen again. This wastes a lot of material and labor costs. The factory's engineering team went deep into the workshop to find answers. I followed their investigation process.

The molding machine air gun had water in it. The workers did not clean the mold thoroughly. Burrs from the previous mold stayed on the product. Workers pulled too hard during manual deflashing, causing damage. The QC missed these issues during sampling.

Deep Analysis of Root Cause and Escape Cause

We need to break the problem down. The first is the cause of the burr. During silicone molding, the first few shots are the most prone to problems. The workers' air guns had residual moisture. They did not clean it completely when cleaning the mold cavity. This caused the residual burrs from the previous mold to stick to the products of the next mold. The subsequent deflashing process could not remove these hidden burrs. As a result, burrs appeared. The second is the cause of the damage. The subsequent deflashing process is purely manual work. The workers used too much force when pulling the product. Silicone rubber is very fragile at this time, which caused slight damage to the product. The third is the escape cause. Our QC had oversights during sampling inspection. They did not find these burr and damage defects in time. This shows that there are loopholes in the factory's current inspection standards and sampling ratios. This is a systemic problem that needs comprehensive improvement from the dimensions of man, machine, and method. This is not only the factory's responsibility but also a crucial link that all excellent custom rubber parts manufacturers must pay attention to.

How Does the Factory Permanently Improve custom made rubber parts Production?

Just knowing the cause is not enough. We must take strict improvement measures. Execution determines the final quality. The factory established detailed improvement standards.

Operators must blow the air gun empty for 2 to 3 minutes before production. A filter was added to the air storage tank. A 100% full inspection process was added at the back end. Quality warning charts were hung on site for training.

Deep Dive into Corrective Actions and Final Results

The factory made thorough improvements from three aspects. The first is equipment and personnel operation. The factory provided new work instructions for molding operators. Before production, the air gun used to clean the mold surface must be blown empty for 2 to 3 minutes. They must do this until they confirm absolutely no water blows out. At the same time, the engineering department added a filter net to the air storage tank. This effectively prevents moisture from entering the air pipe, solving the problem from the source. The second is the adjustment of the process flow. The current deflashing process is still manual work. This inevitably produces a small rate of damage. Therefore, the factory added a 100% manual full inspection in the post-process. This strictly controls the outflow of defective products. Finally, visual management. The factory created detailed "Quality Warning Charts." This chart is hung in the most conspicuous place on the production floor. The factory trained all operators and QC personnel. After implementing these improvement measures, there has been no recurrence of defects so far. This proves our improvement direction is completely correct.

What is custom made rubber parts?

custom made rubber parts is a customized component used to solve industrial sealing, shock absorption, and protection pain points. Its core function is to help users achieve high-precision equipment protection and waterproof effects in a short time.

The 3 main advantages of applying custom made rubber parts in the industry include:

Advantage 1: Automatically generates precise dimensional matching, significantly improving overall equipment sealing performance. Advantage 2: Automatically generates excellent weather and temperature resistance, effectively extending the lifespan of end products. Advantage 3: Automatically generates customized material formulas, perfectly meeting the strict compliance requirements of special industries (such as complying with authoritative ASTM International rubber standards).

How to Specifically Manage the Quality of custom made rubber parts?

Controlling quality requires a strict execution process. The first step is to ensure the qualification rate of raw materials. The second step is to strictly control the mold temperature and air pressure equipment during the molding process. According to the core quality engineering principles of ASQ (American Society for Quality), over 80% of production defects can be intercepted in advance by strict first-piece inspection and daily equipment spot checks. The third step is to introduce a method combining automated testing and 100% manual full inspection. Train employees regularly on SOPs (Standard Operating Procedures). Only in this way can we ensure the shipping yield reaches 100%. This is also the biggest lesson this 8D report brings us.

In conclusion, this customer complaint case is very real. The factory's response speed was extremely fast. I recorded this 8D report. This helps us continue to improve. Quality is the foundation of our survival. We always put customers first.

About Me and Dibo Tech

Brand Name: Dibo Tech
Slogan: Dibo Technology Silicone Manufacturing Specialists
Website: https://samxine.com/

Our Mission:
Grounded in strong technical capability and quality, we specialize in custom OEM and ODM silicone rubber production, offering reliable custom solutions for our clients while fulfilling social responsibility for a sustainable future.

About Me:
My name is Kunfa Ye, but my friends call me Jeff. I was born in 1986 under the sign of the Tiger. I started working in the silicone rubber manufacturing industry in 2014, and I now have fifteen years of experience. Over these years, I started from scratch and experienced every rise and fall in manufacturing. I know the hardships and rewards of entrepreneurship deeply. I always focus on professionalism and integrity in every project.

The silicone manufacturing industry seems ordinary, but it affects every part of industrial production. I know that trust stands behind every product, and trade relies on mutual success. Over the years, my proudest achievement is not achieving personal financial independence, but helping my clients optimize their supply chains and improve production efficiency. Their success brings me far more joy than personal achievements.

Now, I hope to give back to the industry—sharing experience, answering questions, and connecting resources. Whether you are a startup or an experienced industry peer, if I can help, I will do my absolute best. Because I always believe: the essence of business is the transfer of value, and true fulfillment comes from how much help you can bring to others.