29 June 2026

The Case for True Electrostatics: Solving the Energy vs. Efficiency Paradox Plaguing Synthetic Filters with EcoStatic®

Executive Summary
The global requirement for enhanced Indoor Air Quality often imposes an operational energy penalty. Traditional mechanical filters achieving MERV 13 or higher efficiencies rely on dense structures that restrict airflow. The filtration industry has attempted to solve this with synthetic triboelectric media, but these plastic-based alternatives consistently fall short in real-world conditions, losing charge and failing under environmental stress.[1]

This whitepaper presents EcoStatic®, a wool-based depth-filter media developed to decouple collection efficiency from high airflow resistance. Utilising the LanaCORE™ technology platform, EcoStatic® delivers the robust electrostatic performance that synthetic options promise but fail to sustain. It achieves this while maintaining a pressure drop comparable to standard coarse pre-filters. This paper presents empirical data confirming the superiority of EcoStatic® over synthetic counterparts regarding long-term charge stability, moisture resilience, VOC adsorption, and thermal insulation.

1. The Physics of Efficiency: Where Synthetics Fall Short
Conventional high-efficiency media, including electrospun nanofibers and dense meltblown polymers, isolate particles primarily through physical blocking. This structural density causes a sharp increase in resistance as the filter loads.
While synthetic triboelectric filters attempt to shift to electrostatic attraction, they struggle to balance efficiency with permeability. EcoStatic® fundamentally alters this dynamic.

The LanaCORE™ manufacturing process blends proprietary Astino® wool fibres, which possess exceptionally strong tribopositive characteristics, with specific tribonegative polymer fibres. These components are integrated through a drylaid needlepunch process to establish an intrinsic, stable electrostatic field within the media matrix. This open, low-packing-density configuration captures fine particulate matter throughout the volume of the filter, avoiding the severe airflow resistance and rapid performance collapse associated with synthetic alternatives.

2. The Quality Factor Metric
To assess filtration performance relative to energy expenditure, the industry uses the Quality Factor parameter. This metric evaluates collection efficiency alongside fluid dynamics, factoring in face velocity and air viscosity. Lanaco defines the calculation for Quality Factor (abbreviated as Qx) as follows:[2]

Qx = [-ln(P) * vf * µ] / dP

• P: Penetration fraction (1 – Efficiency)
• vf: Face Velocity (m/s)
• µ: Dynamic Viscosity of air (Pa.s)
• dP: Pressure Drop (Pa)


Performance Benchmarks
Evaluated under standardised test parameters (vf = 0.142 m/s and µ = 18.2):

Media Type Efficiency (0.3 µm)  Pressure Drop (Pa)     Qx
EcoStatic® EMP-150P16 95% 10 Pa 774
Synthetic PP-PAN Tribo 110 95% 22 Pa 347
Standard Meltblown Electret 95% 50 Pa 121
Electrospun Nanofiber 95% 95 Pa 62

EcoStatic® EMP-150P16 achieves a Qx value more than twice that of synthetic triboelectric media and over five times that of standard meltblown electrets. The data clearly shows that synthetic media is highly inefficient at balancing energy cost with particle capture compared to wool-based media.

3. Long-Term Charge Stability Validation
EcoStatic® relies on a bulk triboelectric charge embedded within the fundamental material architecture of the wool fibre matrix.
To quantify charge retention over extended periods, multi-year stability evaluations were conducted within an ISO 9001 laboratory using a PALAS MFP 1000 HEPA test rig. The media profile was subjected to a five-year shelf-life and environmental exposure study:
• Initial Efficiency: 98.9%
• Final Efficiency: 96.6%
• Total Efficiency Decay: Only 2.3% over a 5-year duration
The empirical data demonstrates that the EcoStatic® triboelectric field remains functionally permanent, proving it is a reliable solution against synthetics.

4. Moisture, Humidity, and Fluid Management
Superhydrophobicity and Water Resistance
Synthetic media typically rely on surface treatments or weak charges that degrade rapidly when exposed to moisture. EcoStatic® fibres exhibit intrinsic superhydrophobic properties naturally. Contact angle testing indicates that EcoStatic® FP 180 achieves a water contact angle of 155°, compared to a mere 93° for synthetic Technostat+ 100.
Hydrostatic pressure configurations show that EcoStatic® handles significant liquid moisture without immediate wet-through. Tested on the EFP-180 variant by NASA under the AATCC 127 standard, the media demonstrated a liquid water penetration resistance of 120 to 150 mm H2O.

Hygroscopic Buffering and Vapour Transmission
Synthetic media are completely inert to water vapour (0% regain), which leads to rapid condensation and clogging. The underlying keratin structure of EcoStatic® remains highly hygroscopic, managing humidity variations through adsorption and desorption. When exposed to cyclical environmental changes, EcoStatic® dynamically shifts its moisture regain percentage between roughly 8.5% and 12%.
Water vapour transmission rate (WVTR) testing conducted under the AS/NZS 1301.411s:2004 standard confirms that the media allows gas-phase moisture to disperse freely. EcoStatic® exhibits a high transmission rate of 142 g m-2 day-1, mitigating the risk of localised mould cultivation and blinding that plagues synthetic media.

Case Study: Continuous Humidification in Medical Filters
The practical impact of this moisture regulation was evaluated via comparative testing on in-line respiratory medical filters. The configuration utilised a high-flow therapy humidification unit operating at 30 L/min with NaCl aerosol particles at 0.3 µm over a 24-hour period:
• Synthetic Electret (PP-PAN 300 gsm): Experienced a complete performance failure. Airflow resistance rose from an initial 73 Pa to 2034 Pa, while capture efficiency plummeted from 78% to 27%.
• EcoStatic® FP 380: Maintained stable operation. The final pressure drop rose only moderately from 63 Pa to 94 Pa, and particle collection efficiency stayed exceptionally high at 91% (shifting from an initial 98%).

5. Volatile Organic Compound (VOC) Adsorption
Synthetic filters are constructed from inert plastics, meaning they cannot interact chemically with the air to neutralise odours or gases. The chemically active side-chains of the keratin protein structure allow EcoStatic® to capture certain molecular contaminants without the inclusion of supplementary chemical sorbents.[3] Sorbent testing was executed across multiple international standards, including ANSI/AHAM AC-1 (US) and KACA002-132 (Korea):
• US Protocol (EML-150): Achieved a 15.3% reduction in toluene, a 9.0% reduction in nitrous oxide, and a 30.0% reduction in acetic acid.
• Korean Protocol (EFP-350): Achieved a 60.0% reduction in Acetic Acid and a 25.0% reduction in Ammonia.
The structural matrix achieved an aggregate VOC reduction of 25%, which increased to 94% when paired with integrated air conditioning recirculation systems. EcoStatic® actively purifies the air, a function synthetic triboelectrics simply cannot perform.

6. Fire Resistance and Thermal Insulation
Synthetic triboelectric filters pose a severe hazard in high-temperature environments because they melt, drip, and propagate smoke. The natural composition of the EcoStatic® wool fibre yields inherent fire resistance, eliminating the need for halogenated or topical fire-retardant chemical treatments. The media is self-extinguishing, does not melt or drip, and complies with FMVSS 302 safety protocols.[4]

Aerospace Environmental Testing
NASA evaluated EcoStatic® media for use as a mission-critical pre-filter in the contingency breathing apparatus deployed aboard the Artemis Orion spacecraft capsule. The filter assembly was designed to shield primary HEPA systems from hot, toxic particulate matter and molten debris during an active onboard fire scenario.[5] • Operational Longevity: The complete breathing hood system maintained nominal functionality for an 8-hour test period when exposed to elevated thermal loads.
• Flame Resistance Metrics: Demonstrated zero continued after-flame after a 5-second ignition source removal.
• Structural Integrity: Exhibited zero structural melting, dripping, or hole propagation during exposure.
• Thermal Insulation Capability: Successfully insulated vulnerable secondary synthetic components, reducing an external environmental temperature of 125°C down to 37°C at the downstream filter face.
• System Life Extension: Integration of the EcoStatic® pre-filter extended the verified lifespan of the emergency filtration cartridges from 10 minutes to 120 minutes under heavy fire loading.

Conclusion
The empirical evaluation of EcoStatic® demonstrates that true filtration efficiency requires more than just mixing plastic fibres and hoping for a charge. Synthetic triboelectrics fail in humidity, lose their charge over time, and pose significant fire risks. Replacing mechanical restriction with the permanent, wool-based triboelectric fields of the LanaCORE™ platform maintains high particle capture rates alongside extraordinarily low energy consumption. Combined with verified moisture regulation, chemical VOC adsorption, and aerospace-validated thermal protection, EcoStatic® stands entirely in a class of its own for high-efficiency air purification.

References

[1] Rengasamy, S., Miller, A., & Eimer, B. C. (2014). Filter performance degradation of electrostatic N95 and P100 filtering facepiece respirators by dioctyl phthalate aerosol loading. Journal of Engineered Fibers and Fabrics; and Moyer, E. S., & Bergman, M. S. (2000). Electrostatic N-95 respirator filter media efficiency degradation resulting from intermittent sodium chloride aerosol exposure. Applied Occupational and Environmental Hygiene, 15(8), 600–608. — Peer-reviewed evidence that synthetic electret media lose electrostatic charge (and efficiency) under oil-aerosol/particulate loading and humid conditions via charge neutralisation and dielectric film formation.

[2] Quality factor (figure of merit) as defined in standard aerosol-filtration literature: QF = −ln(P)/ΔP, the ratio of collection efficiency to pressure drop; see e.g. Aerosol Science and Technology, “Figure of Merit of Composite Filters” (2008). Lanaco’s Qx extends this baseline metric by incorporating face velocity and air viscosity.

[3] Ghosh, A., & Collie, S. R. (2014). Keratinous materials as novel absorbent systems for toxic pollutants. Defence Science Journal, 64(3), 209–221. — Reviews chemisorption of formaldehyde and other VOCs by wool keratin via reactive amino, amide, carboxyl and thiol side-groups.

[4] International Wool Textile Organisation (IWTO). Wool and Flame Resistance (Fact Sheet). — Wool’s high nitrogen and moisture content give it a high Limiting Oxygen Index, ignition temperature of 570–600 °C, self-extinguishing behaviour, and no melting/dripping.

[5] NASA (2020). Wool Mask to Fight Fires in Space Inspires Fire Equipment on Earth. NASA Spinoff 2020. — Documents NASA’s adaptation, via a Johnson Space Center / Jacobs Engineering contract, of a Lanaco wool pre-filter to extend the life of the Orion emergency breathing device.

Note on data provenance: Quantitative performance figures in this paper (Qx values, efficiency-decay results, contact angles, VOC-reduction percentages, and the NASA thermal/longevity metrics) are drawn from Lanaco internal testing (PALAS MFP 1000 HEPA rig, ISO 9001 laboratory) and third-party evaluations, and are on file with Lanaco. They are product-specific measurements rather than values from the external literature cited above.