Technical & economic comparison

Anti-condensation for large volumes: AS-C tape, calcium chloride, vented plug or hygrostat?

Comparison of the 4 current solutions for large-volume enclosed spaces (> 1 m³): maritime and self-storage containers, industrial electrical cabinets, telecom cabinets, EV chargers, urban furniture. For small-volume IP65 enclosures (sensors, outdoor IoT, cameras), see the AS-B comparison.

4-solution comparison table

Technical and economic criteria for the large-volume target (> 1 m³, outdoor exposure, dispersed fleet).

Criterion	Calcium chloride (Rubson, Wisedry, Damprid)	AS-C tape (So Sponge — SRD material)	Vented plug (GORE, AGM)	Hygrostat + heater
Adsorbs humidity	Yes (rapid saturation)	✓ ×8 useful zone (60-90% RH)	No (equalizes pressure)	Evaporates (does not remove)
Self-regenerating	✗ (consumed)	✓	n/a	n/a
Zero energy	✓	✓	✓	✗ (10-400 W cycle ~30 %)
Zero maintenance	✗ (2-4 month replacement)	✓	✓	✗ (monitoring + failure risk)
Lifespan	2-4 months	Unlimited	3-5 years	5-10 years (hardware)
Integration	Tray	Pre-adhesive strips	Wall drilling (impossible on installed container)	Electrical wiring
Risk to stored goods	⚠ Corrosive brine (potential leaks)	✓ None (inert material)	None	None
Total cost (TCO)	High (recurring + round trips + hazardous waste)	Low (one-time install)	Moderate	Very high (energy + install + maintenance)

Real TCO at scale

Beyond unit cost — operational burden

On a dispersed fleet (containers, boxes, outdoor cabinets), hidden cost isn't in the pouch — it's in the replacement round trip, per-unit tracking and waste management.

4-6 ×

Rubson replacements per year per unit

2-4 month saturation cycle on outdoor container — multiplied by fleet size.

10-400 W

peak hygrostat consumption

Over 10 years: ~$1,650-5,775/unit electricity (€0.20/kWh EU pro tariff).

1 ×

AS-C install, unlimited lifespan

CAPSA-validated 1 year on 10ft container — no performance degradation.

→ On a 100-unit fleet (self-storage boxes, containers, cabinets) over 3 years:

With calcium chloride (Rubson): 100 × 5 cycles/yr × 3 yrs = 1,500 replacement round trips + hazardous waste collection (corrosive brine) + leak risk on stored goods.
With hygrostat + heating resistor (~30% duty cycle): ~$28-110/m³/year electricity — on a 100-unit fleet at 10 m³ average over 3 years: ~$83,000-330,000 + maintenance + active system failure risk.
With AS-C tape: ~$3,300-8,800 invested once, unlimited lifespan, zero round trips, zero waste.

For a personalized estimate on your fleet, use our AS-C ROI calculator.

Selection criteria

Going further on each duel

Calcium chloride (Rubson) vs AS-C tape

Calcium chloride pouches are the sector incumbent in self-storage and containers. Low unit cost ($5-15), real efficacy, but short saturation cycle (2-4 months) and corrosive brine generation. On a dispersed fleet, the recurring replacement round trip and per-unit tracking are the real burden. AS-C tape eliminates this burden via spontaneous regeneration — unlimited lifespan, zero brine.

Vented plug (GORE) vs AS-C tape

Pressure-equalizing vents are designed for small sealed enclosures. On large volumes > 1 m³, they become marginal: they don't remove water vapor (they equalize pressure) and require wall drilling impossible on already-installed containers. AS-C tape applies in minutes, container closed, and actively adsorbs vapor.

Hygrostat + heater vs AS-C tape

The active solution (hygrostat controlling a heating resistor) is effective but heavy: 10-400 W peak consumption (~30% real duty cycle), electrical wiring, additional failure point (resistor fails, hygrostat drifts), preventive monitoring. Relevant on high-power telecom cabinets where power is already available. Unsuitable for outdoor self-storage boxes (no power), maritime containers in static storage, non-powered urban furniture.