Xinxiang Filter

Description:

Medium efficiency filters for cleanrooms serve as the second-stage filtration of cleanroom air conditioning systems. In accordance with GB/T 14295-2019 standard, their particle counting efficiency for particles ≥0.5μm is ≥90% (F8 grade). They are mainly adopted to protect terminal filters and extend their service life, suitable for intermediate filtration links in ISO Class 7–8 (Class 10,000 / Class 100,000) cleanrooms.

Classified by material and structure, medium efficiency filter products include high-temperature resistant separator filters, anti-static filters, separator filters, separator-free filters and bag filters.

Core Technical Advantages:

Ultrasonic seamless fusion process: Filter bags are welded by ultrasonic technology to completely eliminate pinhole air leakage. They feature superior air tightness and bonding strength compared with traditional sewing processes, ensuring stable filtration efficiency without attenuation caused by leakage.

High humidity and flame retardant design: Filter media meet B2 flame retardant standard and withstand high humidity environments (≤90% RH), especially suitable for cleanrooms in southern China.

Optional multiple bag quantities: Medium bag counts (4–8 bags) can be customized as per design requirements to achieve an optimized balance between filtration area and pressure drop.

Low initial resistance: The initial resistance of F8 medium efficiency filters is ≤80Pa, approximately 10% lower than similar industry products to reduce system energy consumption.

Working Condition Matching Table:

Application Fields:

Medium efficiency filters dedicated to cleanrooms

Medium efficiency filters for dust-free workshops

Medium efficiency filters for GMP workshops

Cleanroom filters for electronics factories

Medium efficiency filters for pharmaceutical factories

Medium efficiency filters for food workshops

Medium efficiency filters for laboratories

Custom medium efficiency filters

Case & Data Verification:

An electronic materials factory in Suzhou adopted F8 grade medium efficiency filters matched with AMC chemical filter screens. The AMC concentration inside the cleanroom was controlled below 0.1 ppb, and the wafer yield remained above 99.2%. The replacement cycle of medium efficiency filters is 9 months.

FAQ:

Q1: How to choose between F7 and F8 medium efficiency filters?
A: F7 (80% efficiency) is generally used for intermediate filtration in ISO Class 7 cleanrooms; F8 (90% efficiency) is applied to ISO Class 6 scenarios with higher cleanliness requirements, or as front-end protection for H13 terminal filters.

Q2: What are the advantages of ultrasonic fusion over traditional sewing?
A: Traditional sewing leaves pinholes (approximately 0.3–0.5 mm in diameter), causing bypass of unfiltered air and actual efficiency lower than the nominal value. Ultrasonic fusion creates zero pinholes to guarantee nominal filtration efficiency.

Q3: What is the replacement cycle of medium efficiency filters?
A: Replacement is recommended when the final resistance doubles the initial resistance (approx. 250–300 Pa). In cleanroom environments, F7 filters are suggested to be replaced every 6–12 months; the cycle may be shortened under heavy upstream dust load.

Q4: Are fire resistance certifications required for medium efficiency filters?
A: Yes. Cleanroom specifications require filter media of medium efficiency filters to reach at least B2 flame retardant grade (GB 8624-2012), and material flame retardant test reports shall be provided.