Outdoor IP65 surveillance camera

Electronics & IoT Application

CCTV Camera Housing Desiccant — Anti-Fog for IP65+ Outdoor Cameras

An IP66 outdoor camera that fogs up at 7 a.m. is a blind camera for hours. And it's a 200-1,000 € service call (200-1,200 USD) that no warranty covers.

The AS-B sticker installs inside dome, bullet, or PTZ camera housings. It adsorbs water vapor as soon as internal humidity exceeds 60% RH, then regenerates spontaneously when the air dries. Zero energy, zero maintenance, unlimited lifetime.

8× usable capacity vs silica gel (60-90% RH) IK10 compatible — < 1 mm REACH compliant Designed and made in France
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Why outdoor CCTV cameras fog up

The day/night thermal cycle inside an IP66 dome

An IP65 or IP66 camera housing is sealed against liquid water and dust — but not against water vapor. That technical nuance changes everything in real-world conditions.

During the day, the housing heats up under sun exposure and the sensor's thermal output. Internal pressure rises, and air escapes through micro-leaks at gasket seams, cable glands, or the pressure equalization vent if one is fitted. At nightfall, temperature drops fast — often 15 to 25 °C (27 to 45 °F) in a few hours. Internal pressure drops, and outdoor air loaded with water vapor flows back in through the same micro-leaks.

Over a few cycles, internal humidity creeps up. Once dew point is reached, condensation forms — and it forms first on the coldest surface inside the housing.

Lens fogging: a failure mode of its own

In an outdoor camera, the lens or the dome bubble is almost always the coldest zone of the housing. It sits next to outdoor air with no internal thermal output (the image sensor and PCB are set back). As a result, it's the first surface where condensation forms.

And unlike a windshield's temporary fog, camera fog returns with every thermal cycle — potentially every night in shoulder seasons and every day/night transition in winter.

Beyond fogging: corrosion, battery drain, fungal growth

Internal condensation doesn't stop at the lens. Once moisture is trapped inside the housing, several damages stack up:

RJ45 PoE connector corrosionSignal degradation, packet loss, intermittent disconnects hard to diagnose
12 V power connector corrosionVoltage drops, erratic sensor behavior
Solar battery drainParasitic leakage currents between humid PCB traces
Fungal growth on opticsTropical climates: irreversible degradation of optical transmission

Specialized CCTV professional forums report this issue recurrently — dealers in Malaysia, the Caribbean, and the southeastern United States deal with it on a daily basis.

Operational cost

The hidden cost of a fogged camera

A 200-camera outdoor CCTV deployment with a moderate 5% winter fogging rate generates 10 avoidable service interventions per winter.

200-1,200 USD

per field service call

Sources: PTC Field Service, SightCall

+30 to +100%

boom-lift surcharge

Camera at height vs ground-level intervention

5,000-30,000 USD

avoidable service / 100 cameras / 10 years

Depending on site humidity exposure

Beyond the direct cost:

  • Loss of evidence during fogging windows — litigation exposure, SLA breach on video coverage
  • Cameras to replace rather than clean once corrosion sets in
  • Failed batteries on solar-powered cameras: 30-100 USD replacement per unit
  • Damaged optics from fungal growth in humid climates: full lens module replacement

These hidden costs — not the 0.15 USD silica gel pack — are what weigh on TCO across 5 to 10 years of outdoor CCTV fleet operation.

State of the art

Why current solutions don't work

Five approaches exist today. None combines passivity, unlimited lifetime, and compactness — except the AS-B sticker.

Factory-installed silica gel packs

The default solution. Many manufacturers (Hikvision, Dahua, Bosch on certain models) drop a 1-2 g pack inside the housing at end of line. Negligible material cost, immediate installation.

Limitations:

  • Saturated in 3 to 6 months on an exposed outdoor camera
  • Never replaced in practice once the camera is mounted at 4-meter (13-ft) height
  • Designed for transport and the first months in service, not for 5 to 10 years of operation

→ This is exactly the pain point AS-B solves: spontaneous regeneration, unlimited lifetime.

Pressure equalization vents (Gore PolyVent)

Found on premium outdoor cameras (Axis Q-line, Bosch MIC, Pelco Spectra). An ePTFE membrane that equalizes internal/external pressure to prevent mechanical stress on gaskets during thermal cycling.

Limitations:

  • Does not control internal humidity: water vapor passes through the membrane in both directions
  • Climate chamber tests confirm: an IP66 housing fitted with a breather vent alone condenses as much as a bare housing
  • Significant unit cost (5-15 USD) plus assembly labor

→ AS-B and pressure vents are complementary, not competing: vent for pressure, AS-B for humidity.

Hydrophobic coatings on the lens

Post-equipment solution (Rain-X-type sprays, automotive anti-fog treatments). Covers the glass surface only.

Limitations:

  • Temporary effect (washed off by rain, fouled by atmospheric pollution)
  • Does not address internal humidity, so fog can form on the inside of the dome — invisible and unreachable
  • Useless against PCB or connector condensation

→ Cosmetic mitigation, not a durable protection.

Heated cameras (integrated heater)

Low-temperature outdoor models (Hikvision, Axis specifically for cold climates) include a heating resistor that keeps internal air above dew point.

Limitations:

  • Consumes 3 to 15 W continuously: significant drain on solar or off-grid installations
  • Electromechanical component = additional point of failure
  • High initial BOM cost. Energy overhead 10 years: ~50-300 USD per camera

→ AS-B delivers the same anti-fog result without energy. Ideal: solar cameras, autonomous deployments, remote sites.

Combo silica gel + breather vent

Combination of the first two approaches. Common on premium models. Stacks both individual limitations: pack saturated in months, breather powerless against humidity.

See the full comparison of 5 anti-condensation solutions →

AS-B Solution

AS-B sticker: passive, durable protection

A self-adhesive patch built around a patented mesoporous SRD (Self-Regenerating Desiccant) material, developed at Université Claude Bernard Lyon 1 and IFP Energies Nouvelles, licensed through Pulsalys (Lyon SATT).

How to integrate it in a dome, bullet, or PTZ camera

Dome camera

Internal volume 0.3 to 0.8 L (10-27 fl oz). Format: AS-B/XS (5 cm²) or AS-B/S (10 cm²). Apply on inner cover wall, on the side opposite the lens.

Bullet camera

Volume 0.2 to 0.5 L (7-17 fl oz). AS-B/XS is enough. Apply at the rear of the housing (sensor side).

Outdoor PTZ camera

Volume 1 to 3 L (34-101 fl oz). AS-B/S or AS-B/M. If Gore Vent fitted: combine both. Apply inside base cover or rotating dome inner wall.

Camera technical compatibility

Operating temperature range−20 °C to +70 °C (−4 °F to +158 °F)
IK10 compatibilityYes — under 1 mm thick, doesn't change rigidity or IK rating
REACH complianceYes — certificate available on request
Conformal-coated PCB compatibilityYes — SRD is H₂O-selective, indifferent to organic solvents
PPE on assembly lineNone — inert mineral material, bare-hand handling
Installation time per camera< 10 seconds
Tools requiredNone
NEMA 4X / NEMA 6 outdoor housingsCompatible — same physical principle as IP66

How it works over time

The SRD has two behaviors based on surrounding air humidity:

  • RH > 60%: water vapor adsorption by capillary condensation in the mesopores → housing internal humidity drops
  • RH < 60%: release of adsorbed water → the material returns to its initial state

This cycle repeats indefinitely. Unlike silica gel which saturates and needs replacement, SRD regenerates spontaneously at ambient temperature. Usable capacity over the at-risk range (60-90% RH) is 8 times higher than standard silica gel.

Animation

Silica gel vs SRD: adsorption isotherms under humidity cycling

Observe how the compared materials behave over a single cycle, then across time.

0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 Relative humidity (%) Water adsorbed (mL/g) Cap 0.4 mL/g Silica accumulated: 0.00 mL/g SRD current load: 0.00 mL/g Silica gel (isotherm) SRD (isotherm)
Scrub timeline slow-mo
↤ cycle 1 slow-mo fast cycles →

Cycle

1

Current RH

50%

Silica gel saturation 0%

Cap 0.4 mL/g

⚠ REPLACE
SRD saturation 5%

Cap 0.87 mL/g

↻ 0 cycles complete

Lab test & field validation

IP66 climate chamber validation

30 °C → 0 °C ramp (86 °F → 32 °F) over 1 h 20. Three identical IP66 housings compared:

ConfigurationResult
Bare housing (control)Visible condensation
Housing + pressure vent only (Gore Vent)Visible condensation (matches control)
Housing + AS-B stickerZero internal condensation

The IP66 housing tested is conceptually identical to an outdoor dome camera housing — same IP rating, same thermal constraints. No extrapolation needed.

Read the full test report →

Active B2B validation programs

Weather instrumentation

Leading Nordic manufacturer, outdoor T°/RH sensors

Industrial vision & imaging

German optical sensor manufacturer for automation

Outdoor agricultural robotics

European manufacturer, embedded electronics in open-field exposure

Medical X-ray imaging

Thales group company — internal validation favorable, industrialization under review

FAQ

CCTV cameras and anti-condensation

My IP66 outdoor cameras fog up in winter. Why doesn't the factory-installed silica gel pack work?

A factory-installed silica gel pack saturates in 3 to 6 months on an exposed outdoor camera. Once saturated, it captures no further humidity. In practice, this pack is never replaced in the field — the cost of a boom-lift intervention to swap a 0.15 USD pack is prohibitive.

Does AS-B replace a Gore PolyVent breather on my PTZ camera?

No — they're complementary. The Gore Vent equalizes internal/external pressure to prevent mechanical stress on gaskets, but it doesn't stop condensation. AS-B adsorbs water vapor and prevents fogging, but it doesn't regulate pressure. Both used together on outdoor PTZ.

Does AS-B affect the IK10 impact rating of my dome?

No. The sticker is under 1 mm thick, fully bonded to the inner wall, and introduces no hard point. The housing retains its full IK rating.

Which AS-B format for a dome, bullet, or PTZ?
  • Dome camera (0.3-0.8 L / 10-27 fl oz): AS-B/XS (5 cm²) or AS-B/S (10 cm²)
  • Bullet camera (0.2-0.5 L / 7-17 fl oz): AS-B/XS sufficient
  • Outdoor PTZ (1-3 L / 34-101 fl oz): AS-B/S or AS-B/M

Precise calculator on product page →

Can the sticker release particles or gas that would deposit on the lens?

No. The active SRD material is a chemically neutral mesoporous aluminum oxide — no outgassing, no particle migration to the lens. Optical transparency of the dome is preserved.

Is AS-B compatible with a conformal-coated PCB?

Yes. The AS-B sticker coexists with a conformal-coated PCB without interaction. Outgassing solvents are organic molecules in vapor form — they do not saturate the SRD. The mesoporous material has a strong selective affinity for H₂O via capillary condensation.

What about a solar-powered or autonomous camera?

Ideal use case for AS-B. Zero electrical consumption → no impact on battery energy budget. Outperforms an integrated heater system that draws 3 to 15 W continuously.

How do I integrate AS-B in my camera assembly line?

Manual or automated placement, < 10 seconds per camera. Standard ambient conditions (RH < 80%, room temperature). Stickers stored in original packaging, no dry room required.

MOQ and lead time for a camera manufacturer?

Standard MOQ: 5,000 units for XS, 2,500 units for S/M/L. Lead time: 6 to 8 weeks after order confirmation. Express on request. Tiered pricing — details on the quote page.

Is it UL-listed, RoHS-compliant, EN 50132 / IEC 62676 compatible?
  • REACH: compliant, certificate available on request
  • RoHS: compatible composition
  • UL: not yet UL Recognized — submission considered if volume justifies
  • EN 50132 / IEC 62676: cover functional video surveillance, not anti-condensation accessories. No incompatibility
  • NEMA 4X / NEMA 6: compatible — same physical principle as IP66

Evaluation

Request free samples

Test the AS-B sticker on your own cameras. So Sponge provides free samples for B2B technical evaluation.

Request free samples → Get a quote → Request information →

Related resources

Technical resources

Understand the SRD materialThe material in detail→ Comparison of 5 IP65+ solutionsDetailed alternatives table→ Solar inverter IP65: humidity & condensationRelated outdoor application→ IP66 housing climate chamber testFull test report→