Salt Fog Conditions for Waterproof Connectors: What Applies

Scope and boundaries

Applies to waterproof connector selection for equipment in coastal atmospheres where a salt spray figure is quoted for a specific LLT configuration. The available material confirms that a 480-hour-plus salt spray figure exists as company-provided information for specific material and plating combinations, but it does not include the underlying test report, so this article cannot state which models, plating thicknesses, or criteria that figure covers. Offshore immersion, splash-zone duty, and live mating are outside this scope.

Start with the exposure your equipment actually sees

Take equipment installed near the coast — outdoor lighting, photovoltaic storage, garden machinery. The connector's corrosion burden there comes from salt-laden humid air, condensation, and whatever water reaches the interface, not from the series name on the drawing. A quoted salt spray figure such as '480 hours or more' applies only to the specific plating thickness, sample state, test conditions, and pass criteria behind it, so coastal selection starts from the configuration record, not from the hour count. Before comparing numbers, write down the duty: mated for years or disconnected for maintenance; rain, washdown, or only damp air.

LLT's technical notes describe the '480 hours or more salt spray' figure as company-provided performance information for specific material and plating combinations. That evidence grade matters: the figure is not a property of every product in a series, not a certificate, and not a service-life promise. It points to a test record for one tested configuration — a starting point for questions, not an answer.

Sources: Technical applicability · LLT selection guide

What the salt spray hours cover — and what they do not

Salt fog testing, often labeled salt spray, produces an hour count only under defined conditions. The notes tie the result to each of the following:

That last split changes what 'passed' means. Some higher nickel-plated and gold-plated configurations use maintained electrical performance after the test as their criterion, while other claims may cover appearance only; confirm which applies, per the corresponding report. For a current-carrying contact, request the electrical criterion explicitly — an appearance-only result does not show how contact resistance behaved after exposure. The notes are explicit that the result cannot be converted directly into service life by the sea. No public parameter table carries this figure, so the document still to obtain is the test record for your exact SKU.

• the plating system and thickness on the tested specimens;
• the specimen state during exposure, such as mated pairs with cable attached;
• the test conditions recorded for the exposure, which the hour count alone does not describe;
• the pass criteria, with appearance corrosion and electrical performance assessed separately.

Sources: Technical applicability · LLT selection guide

Plating and base material belong to the SKU, not the series

Contact base material and plating are selected per product specification. The company-provided specification covers solid phosphor bronze contacts with 2 μin gold plating, and it applies only to products marked with that configuration. Two microinches (2 μin) is approximately 0.0508 μm. The gold tone in a product rendering expresses material; it is not evidence of plating thickness, finish, or internal spring material.

If the document for your exact SKU does not name the base material, the plating, and its thickness, the corrosion figure cannot yet be tied to that SKU. Shared housings and series names do not transfer plating between configurations.

Sources: Technical applicability

Test specimen state versus your installation state

Ask whether the tested specimens were mated pairs, locked, and fitted with cable, because your installation state decides how comparable the test is. An IP67 rating, for example, holds when the connector is correctly mated and locked, the seals are intact, the cable outer diameter is within the specified range, and the installation sealing is completed. Unmated ports, the other end of the cable, and the equipment opening need their own protection measures. A chamber result from a mated, cabled specimen says little about a port that ships or sits unmated on site.

If the supplier document names the plating system, the specimen state, and separate appearance and electrical criteria for your exact configuration, you can compare it against your exposure; if any of these is missing, the hour figure is not yet verified for that SKU, and the next step is to request the corresponding specification or test record before approving it.

Sources: Technical applicability · LLT selection guide

Salt fog is one line in a coastal environment specification

The selection guide's environment step asks you to define rain, immersion, washdown, UV, salt fog, and temperature first, then match materials, sealing, and verification items. Coastal duty usually combines several of these, and each carries its own evidence: the '1,000 hours or more' UV figure is likewise company-provided information, and accelerated aging hours cannot be converted into outdoor service years either.

Water exposure needs the same care as salt. IP67 covers short-term immersion under specified test conditions; long-term immersion and high-pressure washdown are different conditions requiring their own verification, with water depth, duration, temperature, medium, and cleaning method stated. Describe the wettest realistic case, not the average day.

Sources: LLT selection guide · Technical applicability

Documents to request before approving a coastal configuration

For a coastal project, request each item against the exact SKU rather than the series page:

Send the target model, the environment description from the first section, and your cable details with the inquiry. LLT provides the corresponding specifications and records per SKU, and custom configurations complete sample verification before release; that exchange, not the hour count on a flyer, qualifies a connector for the coast.

• the salt spray record behind the quoted hours: plating system, thickness, specimen state, test conditions, and appearance and electrical criteria;
• the contact callout on the drawing, confirming whether the phosphor bronze and 2 μin gold configuration applies;
• rated current per contact and voltage for your actual core count — multi-core loading, conductor size, and ambient temperature affect temperature rise;
• the seal adaptation range for cable outer diameter, checked against your jacket OD in mm;
• the protection level in mated and unmated states, plus measures for unused ports;
• certification documents for your market, such as UL 2238, UL 1977, CE, TÜV, or SAA, with coverage read from each certificate's model list.

Sources: Technical applicability · LLT selection guide

Frequently asked questions