Self-regenerating sticker for IP65+ enclosures: 8x the useful capacity of silica gel in the risk zone (60-90% RH), zero maintenance, unlimited lifespan.
The problem
The outside temperature heats the enclosure. Internal pressure increases and air escapes.
Cooling reduces internal pressure. Humid outside air enters the enclosure.
Moisture accumulates. Condensation corrodes electronic components.
35 °C
The outside temperature heats the enclosure. Internal pressure increases and air escapes.
5 °C
Cooling reduces internal pressure. Humid outside air enters the enclosure.
Internal RH > 95%
Moisture accumulates. Condensation corrodes electronic components.
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Leakage currents
Short circuits, signal loss
Corrosion
Connectors, PCB traces
Battery drain
Parasitic discharge
Mold growth
Fungal proliferation
IP65 and higher certified enclosures protect electronic components from liquid water and dust, but they are not airtight against water vapor. Temperature variations between day and night create a thermal breathing phenomenon: hot air escapes during the day, then humid outside air enters at night. Over successive cycles, internal relative humidity gradually increases until reaching the dew point, causing condensation on cold surfaces — printed circuit boards, connectors, sensors. This condensation leads to corrosion, leakage currents, battery discharge and fungal growth. Conventional solutions such as pressure equalization vents do not control internal humidity; silica gel saturates within a few months and must be replaced. The AS-B sticker solves this problem by adsorbing excess water vapor and regenerating spontaneously, without intervention.
Principle
When relative humidity exceeds ~60%, the mesoporous material captures water vapor through capillary condensation.
Internal humidity is maintained below the condensation threshold. Components remain protected.
When the air dries out, the material naturally releases the adsorbed water. The cycle repeats indefinitely.
Technical data
×8
vs silica gel — risk zone (60-90% RH)
60%
RH threshold
IP65+
compatibility
0 W
power consumption
∞
lifespan
REACH
| Material | Mesoporous alumina (SRD) |
| Principle | Capillary condensation — adsorption/desorption |
| Adsorption capacity | 8x useful capacity vs standard silica gel (60-90% RH) |
| Activation threshold | ~60% relative humidity |
| Regeneration | Spontaneous at room temperature |
| Energy required | None (0 W) |
| Maintenance | None |
| Lifespan | Permanent |
| Format | Self-adhesive tape |
| Mounting | Sticks directly onto internal wall |
| Patent | Filed May 2021 |
| Thickness | ± 1 mm |
| Operating temperature | -20°C to +70°C |
| Compliance | REACH — certificate available on request |
See all detailed comparisons by scenario →
Formats
Micro-sensors and embedded electronics.
Small sensors and probes.
AS-B integration in an IoT sensor
IoT enclosures and controllers.
Electrical cabinets and automatic barriers.
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Comparison
5 approaches exist to fight condensation in sealed enclosures. The AS-B Sticker is the only passive, self-regenerating and maintenance-free solution.
| Criterion | Silica gel | AS-B Sticker (So Sponge) | Desiccant sticker (DesiMax, etc.) | Breather vent (GORE, AGM) | Heating element |
|---|---|---|---|---|---|
| Absorbs moisture | ✓ | ✓ ×8 risk zone | ✓ | ✗ | evaporates |
| Self-regenerating | ✗ | ✓ | ✗ | n/a | n/a |
| Zero energy | ✓ | ✓ | ✓ | ✓ | ✗ |
| Zero maintenance | ✗ replacement | ✓ | ✗ single-use | ✓ | ✗ monitoring |
| Lifespan | ~6 months | Permanent | ~6 months | 3-5 years | 5-10 years |
| Integration | Loose sachet | Adhesive sticker | Adhesive sticker | Enclosure drilling | Wiring |
| Total cost (TCO) | High recurring | Low one-time installation | High recurring | Moderate | Very high energy + install |
Eco-design
Over 10 years, the AS-B Sticker turns a recurring consumable line-item into zero waste — a direct lever for your eco-design and ESG objectives.
Across 1,000 enclosures, ~150 kg of waste avoided over 10 years, without collection logistics or field intervention.
Assumptions: 1 L enclosure, 5 g sachet, 3 replacements/year. Learn more about our sustainability approach →
Use cases
The AS-B sticker is designed for small and medium volume enclosures (up to 100 L). For larger volumes (cabinets, containers, shelters), see the AS-C format.
Outdoor IoT enclosures
Outdoor sensors
Surveillance cameras
Telecom cabinets
Industrial controllers
Weather stations
Embedded electronics
Your application?
Contact usSimple
Choose the format suited to your enclosure volume (S, M or L).
Stick the sticker onto the inner surface of your enclosure lid.
The AS-B Sticker operates autonomously. Zero maintenance.
Installation time: < 1 minute · Tools required: none
Evidence
← Swipe to see all tests →
So Sponge Team · Last updated March 23, 2026
The AS-B sticker is an anti-condensation adhesive tape based on mesoporous SRD (Self-Regenerating Desiccant) material patented by So Sponge. Designed for IP65 and higher enclosures, it adsorbs water vapor through capillary condensation when relative humidity exceeds approximately 60%, then spontaneously regenerates at room temperature when the air dries out. Unlike silica gel, it offers 8 times greater useful adsorption capacity in the risk zone (60-90% RH), requires no replacement and operates without energy or maintenance.
The AS-B offers 8 times greater useful adsorption capacity than silica gel in the risk zone (60-90% RH). Unlike silica gel which saturates and must be replaced or regenerated by heating, the SRD material in the AS-B spontaneously regenerates at room temperature. Its lifespan is unlimited, it produces no waste and requires no maintenance.
Pressure equalization vents stabilize internal pressure but do not control humidity inside the enclosure. A comparative test in a climate chamber demonstrated that the AS-B completely eliminates condensation in IP66 enclosures, where a pressure equalization vent fails. The AS-B actively adsorbs internal water vapor.
The AS-B sticker is designed for all IP65 and higher sealed enclosures: outdoor IoT enclosures, electrical cabinets, junction boxes, telecommunications equipment, EV charging stations, surveillance cameras and any electronic device subject to temperature and humidity variations. It sticks directly onto an internal wall of the enclosure.
The AS-B lifespan is unlimited. Thanks to the spontaneous regeneration of the SRD material, the sticker never saturates and maintains its effectiveness indefinitely. Real-world tests have confirmed that no performance degradation has been observed after prolonged continuous use.
Yes. The AS-B sticker coexists without interaction with a tropicalized PCB inside the same enclosure. Solvents that outgas from the conformal coating (acrylic, silicone, encapsulating gel) during the first days after application are organic molecules in gaseous form — they do not saturate the SRD. The mesoporous material has a strong selective affinity for the H₂O molecule via capillary condensation, and remains indifferent to other molecules present at low concentration in the enclosure air.
The SRD has a mesoporous structure with pores in the order of ten nanometers. No solid particles (dust, production residues, abrasive particles) can physically penetrate these pores and degrade adsorption performance. The only possible degradation case would be the entire adsorbing surface being covered by a continuous impermeable liquid film (e.g. sprayed oil or sprayed varnish onto the sticker), which would block water molecule access. Under normal use inside a sealed IP65+ enclosure, this scenario does not occur.
Standard ambient workshop conditions: in original packaging, away from direct water splash and high humidity (RH < 80%). No need for a dry room or specific controlled conditioning. During application on the assembly line, the production environment must also be in normal conditions (typical ambient temperature and humidity) to avoid premature saturation of the sticker before the enclosure is closed.
Yes, no specific PPE required. The active SRD material is a mineral product (mesoporous aluminum oxide), chemically neutral, non-toxic to humans or the environment. The substrate and pre-applied adhesive use standard polymers (polyethylene, cellulose-type) without hazardous chemicals. Direct bare-hand handling is possible during integration on the assembly line.
100% French production. Mesoporous materials are sourced in France, coating is performed by our French industrial partner specialized in deposition processes for several years, and the So Sponge team is based in Lyon. The SRD technology stems from research conducted at Université Claude Bernard Lyon 1 and IFP Énergies Nouvelles, licensed via Pulsalys (the Lyon Saint-Étienne tech transfer office).
Common pitfall in evaluation protocols: a test on a brand-new enclosure can lead to a misleading conclusion, since pristine seals are tight enough that no condensation appears over a few cycles. Yet field service returns related to condensation typically arise after 1 to 2 years of seal aging through thermal cycling. Two recommended approaches to make a test on a new product representative: (a) add a small amount of liquid water inside before closing, to simulate an aged enclosure that has already breathed; (b) instrument with an internal RH+T sensor and cycle in a climate chamber over several weeks to reveal cumulative drift. Our team can help define the protocol.
AirSponge is not yet UL Recognized at this stage. However, we can provide material data sheets, test results, and consider a UL submission if volume justifies it.
The AS-B is a zero-consumable, zero-collection-logistics and zero-replacement solution. Unlike silica gel, which saturates and generates dozens of grams of waste per enclosure per year, the AS-B has a service life aligned with that of the equipment. A direct lever for your eco-design and ESG objectives. Learn more about our sustainability approach →
Further reading
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