Guangzhou, Guangdong, China.

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Ceramic Fiber Filter Performance & Test Reports

How to Read These Numbers — Notes From Our Test Lab

Every figure on this page is stated with its operating envelope, because a performance number without conditions is a sales claim, not engineering data. Filtration precision of 1 μm and >99.9% dust removal hold at a surface filtration velocity of 2–5 cm/s with pulse-jet cleaning at 0.4–0.7 MPa. The 300 Pa clean pressure drop is measured at 1 m/min face velocity with no dust; design your system around 900–1,500 Pa total operating resistance (900–1,300 Pa typical in glass furnace duty). The 600°C continuous rating (1,000°C peak) assumes chemical exposure within stated limits — HF below 5 ppm and no phosphoric acid vapor. If your operating point sits outside any of these conditions, the honest answer is that the headline numbers change; send us your data and we will tell you what to expect instead.

Porosity test report cover from Beijing Beishide Measurement and Testing Center for Guangzhou Anchor Technology ceramic fiber filter (Report BSD20191011-01-17)
Pore diameter test report cover from Beijing Beishide Measurement and Testing Center for Guangzhou Anchor Technology ceramic fiber filter (Report BSD20191018-01-17)
Porosity test results for ceramic fiber filter sample BSD20191011-01-17: outer-part 84.75%, inside-part 85.83%, mid-part 85.03%

Key Performance Specifications

Anchor Technology ceramic fiber filter tubes are engineered for reliable, long-life hot gas filtration in demanding industrial environments. The specifications below are verified by the independent porosity and pore-diameter test reports shown above.

  • Dust removal efficiency: > 99.9%
  • Residual dust after dedusting: < 5 mg/Nm³
  • Operating temperature: up to 600°C continuous, 1000°C maximum
  • Service life: more than 5 years, backed by a 5-year written warranty
  • Corrosion resistance: acid and alkali resistant

Model & Dimensions

Both the non-catalyst and catalytic filter lines are produced in the same AW model range, covering lengths from 300 mm to 3000 mm and a wide choice of inner diameters, flanges and surface areas.

ModelLength (A) mmInner Ø (B) mmOuter Ø (C) mmFlange Ø (D) mmFlange Thk (E) mmFlange Shape (F)Surface Area (G) m²Weight (H) kg
AW30030011015019030T0.11.3
AW50050040608020T0.20.4
AW1000-A100040608020T0.20.65
AW1000-B100011015019530T0.483.2
AW1500-A150040608020T0.280.9
AW1500-B150011015019530T0.74.5
AW2000200012015019530T15
AW1950195012015020065Y15
AW240024008012016030T0.95.5
AW3000-A300012015019530T1.47.5
AW3000-B300011015019530T1.48.5

Remark: It is normal for the actual product dimensions to differ slightly from the table above. Please contact our technical support for the specific tolerance range.

Filtration Performance & Test Reports

The test reports above document porosity and pore-diameter distribution – the two parameters that determine filtration accuracy and pressure drop. These values apply to the standard non-catalyst ceramic fiber filter. For integrated desulfurization and denitrification, see the catalytic ceramic fiber filter.

Need detailed datasheets or full test reports? Contact us and our engineers will provide the complete documentation.

What We Have Seen in the Field: Three Failure Modes and How to Avoid Them

Across 40 installations since 2019, nearly every premature performance problem traces back to one of three causes. Thermal shock — temperature swings faster than 200°C per minute — is managed with warm-up sequences and, in batch processes, a modified installation layout. Acid dew point condensation during cold starts is prevented with insulation, trace heating, or a bypass sequence; this is a design item, not an operating fix. Chemical attack from HF above 5 ppm or phosphoric acid vapor cannot be engineered around at the filter — it must be addressed upstream. None of these is a defect in the filter element; all three are specification issues. That is why our proposals always ask for your worst-case conditions, not your average ones.

Verification You Can Ask For

Production runs under an ISO 9001:2015 certified quality system, and the test data behind these figures is batch-recorded and traceable to raw material lots. For any order you may request: batch dimensional inspection records (±2 mm outside diameter, ±20 mm overall length), filtration performance sampling reports, material certificates, and CE documentation. Third-party inspection (SGS, BV, TÜV) before shipment is welcome at your arrangement. If a number on this page matters to your permit or your process guarantee, ask us for the underlying test report — we would rather show you the data than ask you to trust the brochure.

Frequently Asked Questions — Performance Data

Both, with an important distinction. The >99.9% figure is verified on test rigs against standard test dust at rated velocity, and it holds in the field provided the system is operated within its design envelope: surface filtration velocity of 2–5 cm/s, pulse pressure of 0.4–0.7 MPa, and gas chemistry within the stated limits. Where we have seen field performance drop, the cause has almost always been operating outside those parameters — most commonly velocity pushed above 5 cm/s to squeeze more capacity from an undersized vessel. We publish the operating envelope alongside the headline figure precisely so you can hold us to both.
Our tubes are surface filters with a controlled pore structure built from ceramic fibers of 3–5 μm diameter. The practical result: particles at and above 1 μm are captured on the filter surface at very high efficiency, and a substantial fraction of sub-micron particles are captured as the dust cake forms — the cake itself becomes the active filtration layer. We state 1 μm as the precision rating rather than claiming a laboratory “absolute” rating, because honest B2B communication matters more to us than marketing language. For your emission permit calculations, use the >99.9% total dust removal figure — that is the number our installed systems are measured against.
The 300 Pa figure is the clean-tube resistance at 1 m/min face velocity with no dust. In operation, design your fan and system around 900–1,500 Pa total resistance, which accounts for the dust cake at the end of a cleaning cycle plus ducting and vessel losses. This is comparable to a well-run pulse-jet baghouse and considerably lower than what a blinded bag system drifts to. Two things keep resistance stable over years: correct pulse pressure (0.4–0.7 MPa — higher is not better, it shortens tube life) and staying within the 2–5 cm/s velocity window. If your existing fan is marginal, send us the fan curve with your inquiry and we will check the operating point.
Some gradual increase is normal for any filtration medium, but the mechanism differs from fabric. Bags fail by deep blinding — dust lodges inside the felt where pulses cannot reach it. Ceramic tubes filter on the surface, so a correctly tuned pulse-jet restores resistance close to baseline after every cycle. In our long-running installations, systems that maintain pulse discipline and stay within chemical limits show only modest resistance growth over years of service. What accelerates aging: chronic over-velocity, under-pressure pulsing, condensation events below the acid dew point, and HF or H₃PO₄ exposure. These are exactly the items our commissioning checklist controls.
Every production batch goes through dimensional inspection (outside diameter tolerance ±2 mm, overall length tolerance ±20 mm), visual and structural checks, and sampling tests for filtration performance and mechanical strength. Raw materials are lot-traceable, so any field issue can be traced back to the specific fiber and binder batch. Production runs under an ISO 9001:2015 certified quality system, and CE documentation is available for European projects. For large orders we welcome third-party inspection (SGS, BV, TÜV) at the buyer’s arrangement — we consider that normal practice for industrial procurement, not an inconvenience.
Yes. We routinely supply datasheets, material specifications, and test documentation formatted for permit applications and EPC technical submittals. Tell us which authority or EPC standard you are submitting to (EU IED, US EPA, local MEE requirements, or a specific EPC format) and we will prepare the documentation accordingly. If your consultant needs a specific test condition covered that is not in our standard package, describe it in your inquiry — we will tell you directly whether existing data covers it or what additional verification would be needed.
At the 600°C continuous rating (1,000°C peak), filtration precision and mechanical strength are maintained — that is the design point, not a stretch goal. Peaks toward 1,000°C are tolerable but should be exceptional events, not routine operation; repeated excursions accelerate micro-crack formation. At the cold end, the risk is not cold itself but condensation: operating below the acid dew point lets liquid acid form on the tube surface, which attacks the matrix and blinds the pores. For processes with cold starts, we specify insulation, trace heating, or a bypass warm-up sequence. Give us your start-up and shutdown profile and we will include the right measures in the proposal.

→ See Non-Catalyst Ceramic Fiber Filter and Catalytic Ceramic Fiber Filter for full technical specifications.

Measured Performance in Operating Plants

The figures below are measured inlet and outlet values from operating installations using our ceramic fiber filter elements — not laboratory projections. Customer names are withheld under confidentiality agreements; industry, gas volume and measured concentrations are as recorded on site.

Plant type Gas volume Filters Temperature NOx in → out SO₂ in → out Dust in → out
Float glass furnace, low-temperature DeNOx (Sichuan, China)45,000 m³/h600 pcs250 → 220°C3,364 → 11 mg/m³168 → 6 mg/m³865 → 4 mg/m³
Glass furnace, mid-temperature DeNOx (Anhui, China)120,000 m³/h1,500 pcs370 → 350°C2,554 → 36 mg/m³1,050 → 35 mg/m³967 → 4 mg/m³
Marine diesel engine test rig (Shanghai, China)7,289 m³/h30 pcs164 → 216°C3,045 → 80 mg/m³—15.7 → 2.2 mg/m³
Waste incineration, dioxin destruction (export project)——170–300°C window——Dioxin destruction up to 99.5% TEQ

The catalytic grade works in a 170–300°C window (optimum 220–260°C): roughly 90% DeNOx at 200°C with the low-temperature formulation and about 98% at 280°C, with dioxin destruction by selective catalytic oxidation inside the same tube wall. Full project references are available under NDA — request the reference list.

Rows of ceramic fiber filter tubes on storage racks in the production hall
Production hall — curing racks of ceramic fiber filter tubes
Ceramic filter tubes wrapped and packed for export shipment
Wrapped and packed, ready for export shipment

Calculating the Specific Filter Area Load

The specific filter area load — often called face velocity — is the operating gas flow divided by the total effective filter area: v = Q / A. For a candle-type element, the effective area of one tube is Atube = π × OD × Leff, where OD is the outer diameter and Leff the effective filtration length. Worked through as variables: for a gas flow of Q m³/h at a design face velocity of v m/min, the required area is A = Q / (60 × v), and the element count is N = A / Atube, rounded up. Insert the numbers from your own gas measurement; the full six-step sizing sequence is in the ceramic filter element selection guide.