Filter paper is a critical material in filters, used to remove impurities, and its performance directly affects the filter's efficiency and lifespan. Here are the main parameters of filter paper and their differences:
Filtration Precision (Micron Rating):
Filtration precision refers to the smallest particle size that the filter paper can capture, usually measured in microns (μm). High-precision filter paper can filter smaller particles, suitable for applications requiring high cleanliness.
For example, automotive oil filters typically use 10-20 micron filter paper, while fuel filters may require higher precision paper of 5-10 microns.
Air Permeability:
Air permeability indicates the ability of air to pass through the filter paper under a certain pressure difference. Filter paper with good air permeability can provide better flow rates but may reduce filtration precision.
Air permeability is usually measured in cubic meters per square meter per minute (m3/m2·min).
Tensile Strength:
Tensile strength refers to the maximum stress the filter paper can withstand when stretched. High tensile strength filter paper is more durable and less likely to tear.
Tensile strength is generally expressed in newtons per millimeter (N/mm).
Thickness:
The thickness of filter paper affects its filtration performance and mechanical properties. Thicker filter paper usually has a higher dust-holding capacity but may reduce air permeability.
Thickness is usually measured in millimeters (mm) or microns (μm).
Temperature Resistance:
Temperature resistance refers to the ability of filter paper to maintain stable performance in high-temperature environments. Temperature resistance is a key parameter for filters that need to operate under high temperatures.
Temperature resistance is usually measured in degrees Celsius (°C).
Moisture Resistance:
Moisture resistance indicates the ability of filter paper to maintain stable performance in humid environments. High moisture resistance filter paper is suitable for humid or water-containing filtration environments, such as air conditioning filters.
Moisture resistance is usually evaluated by the change in strength after moisture absorption.
Dust Holding Capacity:
Dust holding capacity refers to the maximum amount of dust the filter paper can hold during use. Filter paper with a high dust holding capacity can extend the filter's lifespan.
Dust holding capacity is generally measured in grams (g).
Material Type:
The material types of filter paper include cellulose paper, synthetic fibers, composite materials, etc. Different materials have different performance characteristics and suitable applications.
For example, cellulose paper is cost-effective and suitable for general filtration; synthetic fibers have high strength and high-temperature resistance, suitable for high-performance filtration requirements.
Understanding these filter paper parameters and their differences can help in selecting the appropriate filter paper for specific application needs.