Quality Assurance

At WJM, quality is not only a standard — it is a core commitment. We believe that stable, consistent, and traceable quality control is the foundation of long-term cooperation. For silicone and plastic products, quality is determined not only by the final inspection, but by every single step from raw material to final packaging.

That is why we have established a full-process quality assurance system, covering:

Raw material inspection → In-process inspection → Post-processing inspection → Final inspection before packing and shipment

Our quality management system is designed to ensure that every product delivered to customers meets the agreed specifications, functional requirements, and appearance standards.

1. Full-Process Quality Control Concept

Unlike traditional “final inspection only” quality control, WJM implements quality control throughout the entire production cycle:

Quality is built into the product, not just inspected at the end
Every key process has its own inspection standard and control point
Problems are prevented at the source, not corrected at the final stage
All quality data is traceable and continuously improved

This system allows us to minimize risks, reduce rework, and guarantee stable mass production quality for silicone and plastic products.

2. Raw Material Inspection

Quality starts from raw materials.

All incoming raw materials, including:

Silicone raw materials (solid silicone, liquid silicone, special-grade silicone)
Plastic resins (ABS, PC, TPU, TPE, PP, etc.)
Color masterbatch, additives, and auxiliary materials

must pass strict incoming quality control (IQC) before entering the warehouse or production line.

Inspection includes:

Material grade and specification verification
Supplier batch traceability check
Appearance inspection (contamination, impurities, moisture, abnormal color)
Basic physical property checks (when required)

Only qualified materials are released for production. Any abnormal or unqualified materials will be isolated, labeled, and returned or replaced to prevent quality risks from entering the production process.

3. In-Process Inspection: Molding Stage

During production, we implement in-process quality control (IPQC) for both:

Silicone molding products
Plastic injection molding products

For silicone products:

Check material mixing ratio and curing condition
Monitor molding temperature, pressure, and cycle time
Inspect:
- Surface defects (bubbles, impurities, flow marks, cracks)
- Dimensional stability
- Deformation and warpage
- Incomplete filling or short shots

For plastic injection products:

Monitor injection parameters (temperature, pressure, cooling time)
Inspect:
- Flash, burrs, sink marks, weld lines
- Color consistency
- Dimensional accuracy
- Structural integrity

Operators and QC staff perform regular sampling inspections and first-piece inspections to ensure:

The first good part is confirmed before mass production
The process remains stable during continuous production

Any abnormality triggers immediate adjustment and correction.

4. Post-Processing Inspection

Many silicone and plastic products require secondary processes, such as:

Trimming / deflashing
Surface polishing
Oil spraying / coating
Laser marking / printing
Bonding / assembling / overmolding

At this stage, WJM performs dedicated quality inspection after each post-processing step to ensure:

No damage to product structure
No surface scratches, stains, or coating defects
No assembly misalignment or looseness
Logos, patterns, and texts are clear, accurate, and durable

This step is especially critical for appearance parts, consumer electronics accessories, and branded products, where visual quality is as important as functionality.

5. Final Inspection Before Packing

Before packaging and shipment, WJM performs 100% or sampling-based final inspection (FQC / OQC) according to the product requirements and customer standards.

Final inspection includes:

Appearance inspection (cosmetic defects, color consistency, cleanliness)
Dimension check (key functional dimensions)
Assembly and fitting check
Function check (if applicable)
Quantity verification
Packaging correctness

Only products that fully meet the quality standard are allowed to proceed to packaging and shipment.

6. Packaging & Shipment Quality Control

Before sealing cartons and shipment:

Packaging method is checked (inner tray, PE bag, blister, etc.)
Product protection is verified to avoid deformation or damage during transportation
Labels, carton marks, and shipping information are checked against order requirements

This ensures that products arrive at the customer site in perfect condition.

7. Traceability & Continuous Improvement

WJM establishes batch traceability systems for:

Raw materials
Production batches
Mold numbers
Inspection records

When necessary, we can trace any quality issue back to the specific material batch, production date, machine, and process parameters.

Meanwhile, we continuously:

Analyze quality data
Improve process stability
Optimize mold design and production parameters
Enhance operator training and quality awareness

Quality improvement is a long-term systematic project, not a one-time action.

8. Our Quality Commitment

At WJM, quality is not just the responsibility of the QC department — it is the responsibility of the entire company.

We are committed to:

Stable mass production quality
Consistent product performance
Reliable delivery for long-term cooperation
Building trust with customers through real and measurable quality control systems

We believe that only stable quality can support long-term business success.

9. Summary: Full-Process Quality Control Flow

Raw Material Inspection → Molding Process Inspection → Post-Processing Inspection → Final Inspection Before Packing → Shipment Control

This full-process quality control system ensures that every silicone and plastic product delivered by WJM meets customer expectations and international quality standards.