• Sizing : 1 sticker < 20 L, then +1 sticker per 20 L
• Double-sided self-adhesive (3M adhesive) : sticks directly to the wall
• Loose, in lots · made in France
Sizing
How many stickers for your volume?
Enter the air volume to protect: the format, the quantity and the lot appear. It is a starting point, which the sizing tool refines for your climate and enclosure sealing.
Large sealed volumes housing critical electronics, with fire and smoke qualification required on any added material. No condensation on the equipped side while the control box exceeds 100 % RH, performance validated at both 160 and 300 cm², and smoke and flammability tests passed at an independent laboratory.
An 85-day field study in mid-winter on three 95 L IP54 stations from the same fleet, 24,385 aligned measurements. Time spent in the condensation zone is divided by 2.6, internal humidity variability by 3, and correlation with the outside falls to 0.02. No power, no maintenance.
Self-storage units and containers, unheated and unventilated, where salt absorbers are consumables to be replaced continuously. Pilots converted into repeat orders site after site: the solution is in routine operation at French operators, across dozens of sites.
Two identical uninsulated 10-foot containers, instrumented and compared after three days of empty calibration. The equipped container stays below 80 % RH while the control suffers "container rain". Strip left in place for close to a year with no loss of performance.
Large IP enclosures — electrical cabinets, storage containers, EV charging stations, technical street furniture — are never perfectly 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 walls and internal components. This condensation leads to corrosion, leakage currents, degradation of stored materials and fungal growth. Conventional solutions such as silica gel saturate within a few months and must be replaced regularly, generating recurring costs and waste. The AS-C sticker solves this problem by adsorbing excess water vapor and regenerating spontaneously at ambient temperature, without intervention or energy.
Principle
How the AS-C protects your equipment
1
Adsorption
When relative humidity exceeds ~60%, the mesoporous material captures water vapor through capillary condensation.
2
Regulation
Internal humidity is maintained below the condensation threshold. Components remain protected.
3
Regeneration
When the air dries out, the material naturally releases the adsorbed water. The cycle repeats indefinitely.
Comparison
Which solution for your IP enclosures?
5 approaches exist to fight condensation in sealed enclosures. The AS-C Sticker is the only passive, self-regenerating and maintenance-free solution.
Scroll the table horizontally →
Criterion
Silica gel
AS-C Sticker(So Sponge)
Desiccant sticker(DesiMax, etc.)
Membrane vent(pressure-equalising vent)
Heating element
Absorbs moisture
✓
✓ ×6 risk zone
✓
different function
evaporates
Self-regenerating
✗
✓
✗
n/a
n/a
Zero energy
✓
✓
✓
✓
✗
Zero maintenance
✗ replacement
✓
✗ single-use
✓
✗ monitoring
Lifespan
~6 months
Unlimited
~6 months
Per manufacturer
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
Simple
How to install the AS-C?
1
Select
Choose the number of stickers (25 × 8 cm, 200 cm²) suited to the volume of your IP enclosure.
2
Apply
Stick the pre-adhesive stickers onto the internal surfaces of the IP enclosure.
3
Forget
The AS-C Sticker operates autonomously. Zero maintenance.
Compare with calcium chloride tubsNumber of installations, calcium chloride consumption, labour: the calculation compares a one-off purchase with a recurring consumable.Open ↓
Return on investment
Calculate your ROI vs calcium chloride
The AS-C sticker is a one-time investment. Tub CaCl₂ is a recurring consumable. Estimate your net savings based on your consumption and the market price excl. VAT.
From the calculator above. 1 sticker = 25 cm × 8 cm (200 cm²) covers ~20 L.
Assumption : 2 kg tub replaced every 3 months (4 cycles/yr = 8 kg).
Average price excl. VAT for 1-2 kg absorber tubs (Pingo, Humydry pro, ManoMano, Castorama Pro) : 4 to 7 €/kg.
Assumption : 4 visits × 30 min × €80/h loaded + travel ≈ 200 €/yr. Adjust to your context.
Excl. VAT : investment = N × stickers/install × €4.49/sticker (Pro AS-C 100 pricing, i.e. €449 excl. VAT per lot of 100 stickers ; volume discounts on quote) · savings = N × (kg/yr × €/kg + labour/yr) × horizon. Labour cost includes quarterly visits and travel. Full methodology →
Eco-design
A structural sustainability advantage
Over 5 years, the AS-C sticker replaces a recurring consumable (calcium chloride) with a permanent passive solution — a direct lever for your eco-design and ESG objectives. Figures based on a storage container equivalent (~33 m³).
Calcium chloride (moisture-absorber tub)
Lifespan
~3 months
Consumable per cycle
~2 kg
Replacements over 5 yrs
~20 cycles
Waste / installation / 5 yrs
~40 kg
Reverse logistics
Tub + brine disposal
Maintenance
Quarterly intervention
Self-regenerating
AS-C sticker (So Sponge)
Lifespan
5+ years
Material installed
~800 g (permanent)
Replacements over 5 yrs
0
Waste / installation / 5 yrs
0 kg
Reverse logistics
None
Maintenance
None
Across 100 installations equipped, ~4 tonnes of chloride avoided over 5 years, with no quarterly intervention or brine handling.
What is the large-format AS-C anti-condensation sticker?
The AS-C sticker is an anti-condensation product from the AirSponge Enclosures range, designed for larger volume IP enclosures. Based on the same mesoporous SRD (Self-Regenerating Desiccant) material patented and used by So Sponge under an exclusive licence, it adsorbs water vapor through capillary condensation when relative humidity exceeds approximately 60%, then spontaneously regenerates at room temperature. It operates without energy, without consumables and without maintenance.
What is the difference between the AS-B and the AS-C?
The AS-B and AS-C use the same patented mesoporous SRD material. The AS-B comes as stickers for small volume enclosures (up to 10 L). The AS-C comes as 25 × 8 cm pre-adhesive stickers (200 cm²), sold loose, in lots, and sized for large volume IP enclosures (above 10 L) such as electrical cabinets, containers and street furniture.
How to install the AS-C sticker?
Installing the AS-C sticker is simple and requires no tools. Choose the number of stickers suited to the volume of your IP enclosure, stick the pre-adhesive stickers onto the internal surfaces, and the stickers operate autonomously without any maintenance.
Does the AS-C require replacement?
No. Thanks to the spontaneous regeneration of the SRD material, the AS-C sticker never saturates and maintains its effectiveness indefinitely. Its lifespan is unlimited, it produces no waste and requires no maintenance.
What results has the AS-C achieved in field testing?
During a test conducted in partnership with NEXTENEO in electric vehicle charging stations in an outdoor environment, the AS-C sticker maintained indoor humidity below 80% continuously for nearly a year, preventing internal condensation. No performance degradation was observed throughout the entire test duration.
Is the product UL qualified?
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.
What is the environmental impact of the AS-C sticker?
The AS-C sticker is a zero-consumable, zero-collection-logistics and zero-replacement solution. Unlike calcium chloride tubs, which generate dozens of kilograms of waste (salt + corrosive brine) per installation over their lifetime, the AS-C stays in place for the full lifetime of the installation. A direct lever for your eco-design and ESG objectives. Learn more about our sustainability approach →
How many AS-C stickers for a cabinet or an enclosure?
Allow about 10 cm² of material per litre of free air: one 200 cm² AS-C sticker covers 20 L. A 50 L cabinet therefore needs 3 stickers, a 100 L one needs 5. Place them high up, on the inside of the door or on the cold walls, away from components that heat up. Beyond a few cubic metres (containers, rooms), the sizing tool and a quotation allow proper sizing.
Does it work in a ventilated or heated cabinet?
No, that is not its target. With a fan, grilles or overpressure, the air is renewed continuously and passive regulation cannot keep up; a heater with a thermostat already handles the problem. The AS-C sticker is for closed cabinets and enclosures (IP54 and above) without forced ventilation, where humidity only enters through thermal breathing.
Can I target a precise humidity level, say 50 %?
No. The AS-C sticker prevents condensation and levels off humidity peaks; it does not bring humidity down to a set point. In a closed enclosure, equilibrium typically settles between 60 and 70 % relative humidity, slightly lower with oversizing. Maintaining a constantly low humidity requires an active system.
The cabinet is opened regularly for maintenance: is that a problem?
No. At each opening in humid weather, the sticker loads temporarily, then regenerates over the following cycles. The base sizing assumes closing in air at 95 % relative humidity. Double the surface if the cabinet is opened very often or in tropical climates.
What happens if the cabinet is no longer sealed or water gets in?
The sticker handles water vapour, not liquid water: water ingress through a tired gasket or a cable entry must be repaired first. If the cabinet breathes a lot (worn gaskets, unsealed entries), effectiveness decreases; allow more surface and fix the sealing.
Which surfaces does the sticker stick to?
The sticker is pre-adhesive (3M adhesive). It holds on painted sheet metal, aluminium, steel, polyester and polycarbonate, on a dry, clean and degreased surface, with firm pressure when applying. On low-surface-energy plastics (polyethylene, polypropylene), run a trial. Adhesion has been verified over several months in containers between −5 °C and +40 °C. A detached sticker keeps working.
Do I need a different reference for each cabinet size?
No. The same 25 × 8 cm AS-C sticker serves all sizes: you apply more or fewer depending on the volume. A single reference simplifies stock and installation in the workshop or on site. For a large fleet, the lot of 100 stickers is the most economical; custom widths and panels are available on quotation.
How can I test on my fleet before a roll-out?
Equip one cabinet and keep an identical cabinet as a control on the same site, each with a temperature and humidity logger. One humid season (October to March) is enough to conclude; a few weeks already give a trend. For a series deployment, we supply a sample kit in exchange for feedback on the results.
What is the temperature range of the AS-C sticker?
From −20 °C to +70 °C continuously, adhesive included. Beyond that, contact us: the mineral material tolerates far higher temperatures; the adhesive and the backing are the limit.
What is the price and how do I order?
Online: lots of 20 stickers (€159 excl. VAT), 60 (€349 excl. VAT) or 100 (€449 excl. VAT), i.e. €7.95 down to €4.49 per sticker, shipped from France. For a fleet, quotation with volume pricing from 2,000 pieces, 4 to 6 weeks after confirmation. Sample kit for series projects.
