HEPA Filter Media: Thickness 0.4-0.8 mm, DOP Penetration ≤0.03%

Component Specifications

Definition

HEPA filter media is a specialized filtration material designed to capture at least 99.97% of airborne particles sized 0.3 microns or larger. It consists of a dense mat of randomly arranged glass fibers or synthetic fibers bonded with a resin binder, creating a tortuous path that traps particles through interception, impaction, and diffusion mechanisms. This component serves as the core filtration element within HEPA filter assemblies used in cleanrooms, pharmaceutical production, electronics manufacturing, and other controlled environments requiring ultra-clean air.

Working Principle

HEPA filter media operates through three primary filtration mechanisms: 1) Interception - particles following air streamlines collide with fibers; 2) Impaction - larger particles cannot follow curved streamlines and embed in fibers; 3) Diffusion - submicron particles exhibit Brownian motion, increasing collision probability with fibers. The media's high fiber density and small pore size create a labyrinthine structure that efficiently captures particles while maintaining acceptable airflow resistance.

Materials

Typically composed of borosilicate glass microfibers (0.5-2.0 μm diameter) with acrylic or other polymer binders. Alternative materials include PTFE membranes, nanofiber coatings, or synthetic polymers like polypropylene for specific applications. Media thickness ranges from 0.3-1.0 mm with basis weights of 50-150 g/m².

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	0.4-0.8 mm
Basis Weight	80-120 g/m²
Pressure Drop	≤250 Pa @ 0.5 m/s face velocity
Media Velocity	2.5-5.0 cm/s
DOP Penetration	≤0.03%
Air Permeability	2-10 cfm/ft² @ 0.5" w.g.
Humidity Resistance	0-100% RH
Filtration Efficiency	≥99.97% @ 0.3 μm
Temperature Resistance	-40°C to 120°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 29463, ISO 16890, EN 1822, IEST-RP-CC001, ASHRAE 52.2

Parent Products

This component is used in the following industrial products

HEPA Filter Assembly

A modular filtration unit designed to capture airborne particles with high efficiency as part of an exhaust system.

View Product Details

Engineering Analysis

Risks & Mitigation

Media tearing during installation
Delamination from frame
Moisture damage reducing efficiency
Chemical degradation from process vapors
Incorrect media orientation reducing performance

FMEA Triads

Trigger: Excessive pressure differential
Failure: Media rupture or bypass
Mitigation: Install pressure gauges with alarms, use reinforced media with scrim backing, implement differential pressure monitoring systems

Trigger: Chemical exposure to incompatible substances
Failure: Fiber degradation and efficiency loss
Mitigation: Select chemically resistant media (PTFE or specialty polymers), implement pre-filters for chemical removal, establish chemical compatibility charts

Trigger: Improper handling during installation
Failure: Physical damage and leakage paths
Mitigation: Develop detailed installation procedures, provide technician training, use protective packaging during transport, conduct post-installation testing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Media efficiency must maintain ≥99.97% at 0.3 μm throughout rated service life. Pressure drop increase limited to ≤100% of initial value. No visible defects exceeding 3 mm in any dimension.

Test Method

Efficiency testing per ISO 29463 using thermal or liquid aerosol generators. Pressure drop measured per ISO 5011. Integrity testing via photometer scan or particle counter scan methods per IEST-RP-CC034.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of HEPA Filter Media

Manufacturer profiles associated with HEPA Filter Media.

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Frequently Asked Questions

What is the difference between HEPA and ULPA filter media?

HEPA media captures ≥99.97% of 0.3 μm particles, while ULPA (Ultra Low Penetration Air) media captures ≥99.999% of 0.12-0.17 μm particles. ULPA has higher efficiency but also higher pressure drop and cost.

How often should HEPA filter media be replaced?

Replacement depends on operating conditions, typically 1-5 years. Monitor pressure drop increase (usually replace when double initial value) and conduct regular integrity testing per ISO 14644 standards.

Can HEPA filter media be cleaned or reused?

No, HEPA media cannot be effectively cleaned without damaging the fiber structure. Attempting to clean can create holes and compromise efficiency. They are designed as disposable components.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

HEPA Filter Media