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Primary and medium efficiency filter cotton G2, G3, G4, F5, F6
Pre-filters are primarily used to capture particles larger than 5μm, serving as a pre-filtration layer to protect subsequent high-efficiency filter media and extend their lifespan;Medium-efficiency filters target particles from 1μm to 5μm and are commonly used in the intermediate stage of multi-stage filtration systems. Both are typically used together to improve overall purification efficiency and system economy. Pre-filter media are mostly fiber cotton, graded G1-G4; medium-efficiency filter media commonly use polyester fiber, graded F5-F9, offering higher filtration precision and durability. A proper combination effectively balances performance and cost.
Product Overview:
Pre-filter cotton is primarily used to capture particles larger than 5μm, serving as a pre-filtration layer to protect subsequent high-efficiency filter media and extend their lifespan. Medium-efficiency filter cotton targets particles from 1μm to 5μm and is commonly used in the intermediate stage of multi-stage filtration systems. Both are typically used together to improve overall purification efficiency and system economy. Pre-filter media is mostly made of fiber cotton, graded G1-G4; medium-efficiency filter media commonly uses polyester fiber, graded F5-F9, offering higher filtration precision and durability. A proper combination effectively balances performance and cost.
Features:
1. Made of chemical synthetic fibers such as polyester, polyamide, nylon, etc., it is made in a non-woven, multi-directional, and gradient needle-rolling method according to the thickness and density of the fiber line diameter. It has the characteristics of high air permeability, low pressure loss, and high dust collection capacity
2. Made of composite fibers with different melting points inside and outside, the joints between the fibers are firm, tightly combined, and not easy to fall off
3. No chemical adhesives are added, and hot-melt fibers are used to mix and stick the coarse and fine fibers together. It is not easy to ignite when encountering a fire source, and the flame retardant point meets the German industrial standard DIN53438F1
4. It can be washed and reused
5. It can be equipped with a galvanized steel plate frame or an aluminum alloy frame, and a metal back mesh can also be installed to effectively support the filter to withstand large air volume and not be easily deformed
Application:
Suitable for various industries such as electronics, pharmaceuticals, and food, for pollution prevention, fresh air filtration, pre-filter for medium-efficiency filtration, and return air filtration in air conditioning systems
**Particle size efficiency：
| Nanmar standard filtration grade | Particle size efficiency (%) (colorimetric method) | ||
| 5um | 10um | 15um | |
| NMG2 | 10-20 | 70-80 | 92 |
| NMG3 | 20-40 | 80-90 | 96 |
| NMG4 | 40-55 | 90-95 | 99 |
Test conditions:
1. Test at rated air volume
2. Test with new filter and filter cotton
3. Use atmospheric dust as test dust P7
| Nanmar standard filtration grade | Particle size efficiency (%) | ||
| 1.0um | 5.0um | 10.0um | |
| NMF5 | 30-40 | 95 | 97-99 |
| NMF6 | 55-65 | 98 | 99 |
| NMF7 | 93-97 | 100 | 100 |
Test conditions:
1. Test at rated air volume
2. Test with new filter and filter cotton
3. Use atmospheric dust as test dust P7
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