Most popular HumiSeal coating type
The most popular HumiSeal coating type used in the electronics industry is acrylic-based Conformal Coating, with HumiSeal 1B31 being the most widely adopted product. It is commonly used in PCB Assembly, Prototype PCB Assembly, and SMT Assembly due to its excellent balance of performance, cost, and ease of processing.
Why acrylic coatings are the most popular
Acrylic coatings dominate the conformal coating market because they offer reliable protection with simple processing requirements. In most PCB Assembly applications, manufacturers prioritize coatings that are easy to apply, fast to dry, and cost-effective—making acrylic the preferred choice.
They provide effective protection against:
- Moisture and humidity
- Dust and contamination
- Corrosion in general environments
This makes them suitable for a wide range of electronic products.
Why HumiSeal 1B31 is the industry standard
Among acrylic coatings, HumiSeal 1B31 is considered the benchmark product.
It is widely used in SMT Assembly and Prototype PCB Assembly because of several key advantages:
- Fast drying speed, improving production efficiency
- Single-component formulation, easy to handle and apply
- Good flexibility, reducing cracking risk
- UV traceability, allowing easy inspection under UV light
- Excellent reworkability, enabling easy repair and modification
These features make it highly practical for both development and mass production.
Applications in PCB manufacturing
In PCB Assembly, acrylic coatings like 1B31 are used for general-purpose protection in:
- Consumer electronics
- Power supplies and adapters
- LED lighting products
- Industrial control systems
In Prototype PCB Assembly, it is especially preferred because engineers can easily remove and reapply the coating during testing and iteration.
In SMT Assembly, its fast drying and compatibility with automated processes help maintain high production throughput.
Comparison with other HumiSeal coating types
While acrylic coatings are the most popular, other types are used for specific requirements:
- Silicone coatings → best for high temperature and vibration resistance
- Polyurethane coatings → strong chemical resistance
- UV-curable coatings (e.g., UV40) → ideal for high-speed automated production
However, these alternatives are typically selected for specialized environments, whereas acrylic coatings cover the majority of standard applications.
Why it remains the top choice
The reason acrylic coatings like HumiSeal 1B31 remain the most popular is their balanced performance:
- Low cost
- Fast processing
- Easy rework
- Sufficient protection for most environments
For many manufacturers, this combination delivers the best overall value in PCB Assembly and SMT Assembly.
Final insight
The most popular HumiSeal coating type is acrylic conformal coating, with HumiSeal 1B31 as the leading product. In PCB Assembly, Prototype PCB Assembly, and SMT Assembly, it serves as the default choice for general-purpose protection, offering a practical balance between performance, cost, and manufacturability.
We support HumiSeal and equivalent conformal coating solutions for your PCBA projects.
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Shenzhen Tengxinjie Electronics Co., Ltd.
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