HumiSeal 1B31 and where is it used
HumiSeal 1B31 is a widely used acrylic-based Conformal Coating designed to protect electronic assemblies from environmental damage. It is one of the most popular coatings in PCB Assembly, Prototype PCB Assembly, and SMT Assembly due to its balance of performance, cost, and ease of use.
What is HumiSeal 1B31?
HumiSeal 1B31 is a single-component (1K), fast-drying acrylic conformal coating that provides protection against moisture, dust, and environmental contaminants on printed circuit boards.
Key characteristics include:
- Fast drying (touch dry in about 10 minutes)
- Excellent moisture and environmental protection
- Good flexibility, reducing risk of cracking
- UV fluorescence for easy inspection
- Easy rework and repair (can be removed or reapplied)
- Compliant with IPC-CC-830 and MIL standards
Typical coating thickness is 25–75 microns, making it suitable for most standard electronics protection needs.
Where is HumiSeal 1B31 used?
HumiSeal 1B31 is primarily used in protecting printed circuit boards and electronic assemblies across various industries.
PCB Assembly applications
In standard PCB Assembly, it is applied to protect boards from humidity, dust, and corrosion, especially in consumer and industrial electronics.
SMT Assembly production lines
In SMT Assembly, it is often used in automated or selective coating processes due to its low viscosity and fast drying, which supports high-throughput production.
Prototype PCB Assembly
For Prototype PCB Assembly, it is highly preferred because it is easy to apply and rework, allowing engineers to modify or repair boards during development.
Consumer electronics
Used in devices like power supplies, LED drivers, and home appliances where moderate environmental protection is required.
Industrial and automotive electronics
Applied in control systems and automotive modules where protection against moisture and contaminants is necessary, but full encapsulation is not required.
Telecommunications and LED lighting
Common in LED PCBs and communication equipment due to its good insulation and reliability.
Application methods
HumiSeal 1B31 can be applied using multiple methods, making it versatile for different production scales:
- Spray coating (manual or selective)
- Dip coating
- Brush coating
This flexibility makes it suitable for both low-volume prototype work and high-volume SMT Assembly lines.
Why it is widely used
The main reason HumiSeal 1B31 is so popular in Conformal Coating is its cost-performance balance:
- Lower cost compared to silicone or parylene
- Fast processing time
- Easy inspection and repair
- Reliable protection for most environments
However, it is not ideal for extreme conditions (e.g., very high temperature or strong chemical exposure), where silicone or urethane coatings may perform better.
Final insight
HumiSeal 1B31 is considered a standard, industry-proven acrylic conformal coating widely used in PCB Assembly, SMT Assembly, and Prototype PCB Assembly. It is best suited for applications requiring reliable moisture protection, fast processing, and easy rework, making it a go-to solution for many electronics manufacturers.
Get a Conformal Coating Quote
Need conformal coating for harsh environment applications? Submit your inquiry below.
Send us your requirements and get a fast response from our engineering team.
✔ 24-hour response ✔ Engineering support ✔ Small & Mass Production
Shenzhen Tengxinjie Electronics Co., Ltd.
English 
Deutsch 
Français 
Português do Brasil 
Español 
日本語 
Nederlands 
Italiano 
Русский 
한국어 
العربية 
Svenska 
Polski 
Türkçe 
繁體中文