How to Choose Nylon Bristles for Industrial Brushes

When it comes to manufacturing industrial brushes, selecting the right bristle material is important for its performance. Nylon bristles are among the most popular materials used in the production of industrial brushes such as Nylon Strip Brushes, Nylon Roller Brushes, Nylon Tube Brushes, and Nylon Disc Brushes.

In this blog, we will explore the four most common types of nylon bristles used in industrial brushes: PA6, PA66, PA610, and PA612. Understanding their unique properties will help you make an informed choice for your specific applications.

1, PA6 (Nylon 6) Bristles

Melting Point: 220°C

Density: 1.12–1.16 g/cm³

Water Absorption: 3.5%

PA6 nylon bristles are widely used for their excellent fluidity and stability. They have a lower melting point compared to other nylons, making them suitable for applications that do not require high-temperature resistance. PA6 is softer than PA66, and its stability is superior, though it absorbs more moisture, which can affect its performance in humid environments.

Advantages:

• Good flowability
• Stable performance
• Cost-effective for lower-temperature applications

Disadvantages:

• Lower temperature resistance compared to PA66
• Higher moisture absorption

2, PA66 (Nylon 66) Bristles

Melting Point: 265°C

Density: 1.12–1.16 g/cm³

Water Absorption: 2.5%

PA66 is one of the most commonly used nylon materials in industrial brushes due to its superior mechanical properties. It has a higher melting point, making it ideal for high-temperature applications. It also offers better wear resistance, tensile strength, and rigidity compared to PA6.

Advantages:

• Excellent tensile strength and wear resistance
• Better rigidity and durability for heavy-duty applications
• Higher temperature resistance (265°C)

Disadvantages:

• Slightly higher moisture absorption than PA610 and PA612
• Less flexible than PA6

3, PA610 (Nylon 610) Bristles

Melting Point: 225°C

Density: 1.06–1.08 g/cm³

Water Absorption: 1.5%

PA610 has a lower density than both PA6 and PA66, offering a softer feel. It is known for its good chemical resistance, particularly in strong alkali environments, and is more resistant to weak acids compared to PA6 and PA66. Its ability to retain shape and durability makes it suitable for brushes in demanding environments.

Advantages:

• Better resistance to weak acids and strong alkalis
• Softer touch compared to PA66
• Lower moisture absorption than PA6 and PA66

Disadvantages:

• Lower tensile strength and rigidity than PA66
• Moderate temperature resistance (225°C)

4, PA612 (Nylon 612) Bristles

• Melting Point: 220°C
• Density: 1.06 g/cm³
• Water Absorption: 0.6%

PA612 is one of the best choices for applications requiring exceptional flexibility, toughness, and wear resistance. It is ideal for environments with high chemical exposure and moisture, as it has a very low moisture absorption rate and can withstand strong alkalis and weak acids. However, it has slightly lower temperature resistance than PA6, PA66, and PA610.

Advantages:

• Excellent flexibility and wear resistance
• Very low moisture absorption
• High toughness and resilience
• Better chemical resistance than PA6 and PA66

Disadvantages:

• Slightly lower temperature resistance (220°C)
• May not be suitable for extreme high-temperature environments
• 

Which Nylon Bristle Should You Choose?

The choice of nylon bristle material largely depends on your specific application needs. Here are a few guidelines to help you decide:

• For high-temperature applications: PA66 offers the best heat resistance and durability.
• For soft touch and good chemical resistance: PA610 and PA612 are excellent choices for softer, more flexible brushes.
• For cost-effective and versatile use: PA6 is an affordable choice for general industrial applications that don’t require high-temperature or high-stress performance.

At Ba Jie Brush, we offer a wide range of custom-made industrial brushes tailored to meet your specific needs. Contact us today to learn more about our high-quality nylon bristles and how they can enhance your industrial processes.