Moisture Balance / Analysis

Precision Control: A Technical Guide to Moisture Analysis in Advanced Manufacturing

In the production of high-complexity components—such as those for the medical, automotive, and aerospace sectors—the quality of the raw material is just as critical as the precision of the mold. For high-performance polymers, the presence of even trace amounts of water can lead to catastrophic failure. A Moisture Balance (or Moisture Analyzer) is the essential metrology tool used to verify that materials are properly dried before the injection molding process begins.

The Principle of Operation: Loss on Drying (LOD)

A moisture analyzer operates on the thermogravimetric principle, often referred to as "Loss on Drying" (LOD). The instrument consists of two integrated units: a precision weighing scale and a heating unit (typically a halogen lamp).

The process involves three synchronized steps:

Initial Weighing: The instrument records the precise starting weight of the sample.
Controlled Heating: The halogen heater quickly reaches the set temperature (e.g., 120°C to 180°C), evaporating all moisture within the material.
Final Analysis: The scale continuously monitors the weight loss. Once the weight stabilizes, the instrument calculates the moisture content.

The calculation is expressed as:

$$MC\% = \frac{W_{initial} - W_{final}}{W_{initial}} \times 100\%$$

Why Moisture Control Matters for High-Performance Polymers

For advanced materials like PEEK, LCP, and PFA, moisture control is not just a preference—it is a chemical necessity. These materials are often hygroscopic, meaning they actively absorb moisture from the surrounding air.

Preventing Hydrolysis: In materials like PEEK, excess moisture at high processing temperatures causes a chemical reaction called hydrolysis, which breaks the molecular chains and permanently weakens the mechanical properties of the part.
Eliminating Surface Defects: Moisture turns to steam inside the injection cylinder, leading to "silver streaks" (splay marks) or internal voiding. This is critical for parts requiring specific surface finishes, such as glossy or matte medical instrumentation.
Structural Integrity for Aerospace: For projects like TASA stator coil rings, where parts must survive vacuum environments, ensuring 0.02% or lower moisture content is vital to prevent outgassing and structural failure.

Advanced Heating Profiles

Modern moisture analyzers offer sophisticated heating modes to protect sensitive samples from scorching while ensuring speed:

Standard Mode: A steady ramp up to the target temperature.
Fast Mode: Overshoots the temperature slightly to reach the drying point faster, ideal for robust materials.
Step Mode: Increases temperature in stages, which is necessary for materials with high volatile content or specialized additives.

The "Total Engineering" Perspective

In a facility focused on Total Engineering Solutions, the moisture analyzer acts as the first gate in the quality control workflow. By integrating moisture analysis with precision 5-axis machining and ZEISS CMM validation, manufacturers can ensure a "closed-loop" quality system where the material, the process, and the final geometry are all verified to the highest international standards.

As the manufacturing industry moves toward even more demanding applications in power electronics (IGBT/SiC) and space exploration, the moisture analyzer has become an indispensable tool. It provides the scientific data required to prove that a component isn't just the right shape, but also possesses the correct internal material characteristics to perform in the field.

Moisture Balance / Analyzer: Ming-Li Precision’s Precisa XM60 for Accurate Moisture Control

Introduction

In precision manufacturing, controlling material moisture content is a critical factor that directly affects product quality, dimensional stability, and process consistency. Improper moisture levels can lead to:

Material degradation
Surface defects (silver streaks, bubbles)
Dimensional instability
Reduced mechanical performance

At Ming-Li Precision Steel Molds Co., Ltd., strict material control is part of its advanced quality assurance system. One of the key instruments supporting this capability is the Precisa XM60 Moisture Analyzer, designed for fast, accurate, and reliable moisture determination.

What is a Moisture Balance / Analyzer?

A moisture analyzer determines the moisture content of materials by:

Heating the sample
Evaporating moisture
Measuring weight loss over time

This method provides:

Direct moisture percentage (%) results
Fast and repeatable analysis
Reliable data for process control

Moisture analyzers are widely used in:

Plastics and polymers
Electronics components
Food and pharmaceutical industries

Precisa XM60: High-Precision Moisture Analysis

The Precisa XM60 is a Swiss-engineered moisture analyzer designed for laboratory and production environments, offering:

Weighing capacity up to 124 g
Weight readability of 0.001 g (1 mg)
Moisture resolution down to 0.01%
Wide temperature range: 30°C to 230°C

Higher-end versions (XM60-HR) can achieve even finer resolution:

0.0001 g readability / 0.001% moisture resolution

Key Features and Advantages

1. Fast and Accurate Moisture Determination

The XM60 uses a heating-and-drying principle to:

Deliver rapid moisture results
Ensure high measurement accuracy
Support real-time process control

This significantly reduces waiting time compared to traditional oven methods.

2. Wide Temperature Control Range

With a heating range of 30°C to 230°C, the system can handle:

Engineering plastics (PEEK, PA, PBT, LCP)
Electronic components
Sensitive materials requiring controlled heating

3. Flexible Heating and Analysis Methods

The XM60 supports:

Multiple heating profiles (standard, ramp, boost)
Automatic endpoint detection
Up to 20 programmable methods

This allows Ming-Li to optimize moisture analysis for different materials and applications.

4. High Repeatability and Reliability

The system offers:

Stable measurement performance
High repeatability (approx. 1 mg level)
Robust construction for production environments

5. Data Integration and Traceability

With built-in connectivity (RS232 / optional USB), the XM60 enables:

Data export for SPC and reporting
GLP/GMP compliant documentation
Integration with quality management systems

Applications at Ming-Li Precision

The Precisa XM60 plays a critical role in:

• Raw Material Inspection

Checking moisture content of plastic resins before molding
Preventing defects caused by excessive moisture

• Injection Molding Process Control

Ensuring proper drying conditions
Maintaining consistent material properties

• High-Performance Material Validation

Monitoring moisture in engineering plastics such as:
- PEEK
- LCP
- PA and PBT

• Quality Assurance and Incoming Inspection

Verifying supplier material quality
Supporting stable mass production

Why Moisture Control Matters

Moisture content has a direct impact on:

Surface quality (burn marks, bubbles, streaks)
Mechanical strength
Dimensional stability
Electrical performance (for electronic components)

By using the Precisa XM60, Ming-Li Precision ensures:

✔ Consistent material quality before production
✔ Reduced defect rates
✔ Improved process stability
✔ Higher final product reliability

Ming-Li Precision’s Quality Commitment

With advanced inspection systems including:

ZEISS CMM
ZEISS O-INSPECT optical measurement
ZEISS optical microscope
ACCRETECH RONDCOM
Mitutoyo surface roughness tester
Precisa XM60 moisture analyzer

Ming-Li Precision delivers:

Full-spectrum quality control—from material to final product
Sub-micron measurement capability
Reliable, data-driven manufacturing processes

Combined with expertise in insert molding, 2K molding, and ultra-precision tooling, Ming-Li provides a complete Total Engineering Solution.

Conclusion

The Precisa XM60 Moisture Analyzer ensures precise control of material moisture, which is essential for achieving high-quality and consistent manufacturing results.

At Ming-Li Precision, this capability plays a vital role in preventing defects, improving product performance, and ensuring customer satisfaction.

Contact Ming-Li Precision

If your project requires:

High-precision mold manufacturing
Advanced material control and inspection
Reliable injection molding solutions

Ming-Li Precision is your trusted partner for precision and quality.