IP67 vs IP68 Ingress Ratings: A Procurement Guide for Connectors and Enclosures

IP67 and IP68 are test-based enclosure classifications, not promises that a connector or box is permanently waterproof in every installation. For a buyer, the useful question is not simply “Is IP68 better than IP67?” It is: Which exact product, in which assembled state, passed which dust and water tests under what conditions—and do those conditions match the project?

This guide shows importers, distributors, solar accessory buyers, RV and marine OEMs, and equipment manufacturers how to translate an IP67 or IP68 claim into a comparable RFQ. It does not certify any SINAWATTS or third-party product. The project owner, qualified designer and applicable approval authority remain responsible for the final requirement and acceptance decision.

Key takeaways

• In both IP67 and IP68, the first digit 6 denotes the highest solid-object category in IEC 60529: dust-tight protection and protection against access to hazardous parts under the applicable test.
• The second digit is the critical difference: 7 addresses temporary immersion under standardized conditions; 8 addresses continuous immersion under conditions that must be defined for the product and be more severe than the IPX7 condition.
• “IP68” alone is commercially incomplete. The RFQ and evidence should state the tested depth or pressure, duration, specimen state, cable and seal configuration, and acceptance criteria.
• An immersion rating does not automatically prove resistance to water jets, pressure washing, salt water, condensation, UV, vibration, thermal cycling, chemicals or long service life.
• A connector rating may depend on the connector being fully mated, correctly terminated and tightened around an approved cable. An enclosure rating may depend on specified glands, plugs, gaskets, mounting and closed doors or covers.
• IP and NEMA enclosure type designations are not interchangeable labels. Select the system required by the target market and product standard, then obtain evidence for that exact claim.

IP67 vs IP68: the procurement answer

The official IEC 60529 consolidated-edition page identifies the standard as the classification of degrees of protection provided by enclosures for electrical equipment within its scope. Intertek’s IEC 60529 IP testing overview summarizes IPX7 as protection against the effects of temporary immersion and IPX8 as protection against continuous immersion. Neither source turns an IP code into an unlimited guarantee for every fluid, pressure, duration or installation.

Decode the two digits before comparing suppliers

The first digit: solid objects and access

The first characteristic digit describes protection against access to hazardous parts and ingress of solid foreign objects. In IP67 and IP68, 6 is the dust-tight category. A supplier should still identify how the specimen was prepared and whether negative pressure was applied during dust testing where the selected method requires it. The result belongs to the tested construction; it should not be transferred casually to a different housing, vent, gasket, cable diameter or production process.

If a document shows IP6X, the X does not mean zero protection against water. It means the water characteristic is not stated by that code. Likewise, IPX8 states a water classification without declaring the solid-object digit. Do not rewrite either as IP68 unless evidence covers both digits.

The second digit 7: temporary immersion

The 7 classification addresses harmful water ingress during temporary immersion under the IEC 60529 test arrangement. It is commonly described in product literature as a limited immersion test, but procurement should point to the governing standard and the actual report rather than relying on a marketing shorthand.

IP67 does not mean the product may remain underwater indefinitely. It also does not establish survival under repeated connector movement, energized thermal cycling, salt water, detergent, high-pressure spray or an aged seal. If accidental immersion is the hazard, define its plausible duration, water depth, temperature, orientation and recovery requirement in the product specification.

The second digit 8: continuous immersion under declared conditions

The 8 classification addresses continuous immersion under conditions established for the product and more severe than the IPX7 condition. This is why two products both marked IP68 may have materially different evidence. One report may use a different pressure, depth, duration, specimen state or acceptance basis from another.

For a useful IP68 quotation, require the supplier to write the conditions next to the rating—for example, the tested water depth or applied pressure and test duration—then confirm those values against the report. “IP68 waterproof” with no conditions is not a complete engineering response.

Do not interpret the higher immersion digit as universal superiority. The water tests for dripping, spraying, jets, immersion and high-pressure cleaning address different exposures. A product needed for both washdown and immersion should carry and substantiate the appropriate separate claims required by the governing specification.

Define the rated object: connector, enclosure or installed system

An IP claim attaches to an enclosure in a stated condition. The practical difficulty is deciding what the tested enclosure actually included.

For a cable connector, ask whether the rating applies:

• only when the male and female halves are fully mated and locked;
• when unmated with a specific sealing cap installed;
• to the panel receptacle after mounting to a specified panel thickness;
• with one exact cable outside-diameter range and conductor construction;
• after the gland, backshell or retaining nut is tightened to a documented value;
• in every permitted cable exit direction and mounting orientation; and
• before or after the endurance, temperature, vibration or aging sequence required by the product standard.

For an electrical enclosure, define the door position, latch setting, gasket, mounting feet, drain or breather, cable glands, blanking plugs, conduit fittings and every opening. A Type- or IP-rated empty box does not automatically give the finished equipment the same rating after holes, displays, switches and connectors are added.

The “weakest interface” principle is a good procurement screen: the system cannot be released at a higher degree of protection than an unqualified opening or assembly interface. However, simply selecting individually rated parts is not always sufficient evidence for the final assembly. Interface geometry, panel preparation, torque and installation instructions still matter.

IP68 is not a permanent-waterproof claim

Water can reach an enclosure through several mechanisms that a single new-product immersion test does not reproduce:

• a gasket takes compression set after months of heat;
• cable jacket diameter or hardness differs from the tested cable;
• a gland is under-tightened, over-tightened or side-loaded;
• pressure changes draw moisture through a seal as the enclosure cools;
• repeated mating damages a connector seal or locking feature;
• UV exposure, oil, cleaner or salt degrades a polymer or metal interface;
• vibration loosens a threaded element or moves a cable; or
• field drilling, paint, dirt or a pinched gasket changes the sealing surface.

An IP classification is valuable because it standardizes a defined ingress test. It is not a durability model for every application. UL Solutions lists ingress testing separately from temperature, humidity, vibration, thermal shock, salt fog, ozone and UV in its environmental simulation testing services. That separation is a useful RFQ lesson: select each environmental test from the hazard analysis instead of asking one IP code to represent them all.

For outdoor solar, RV or marine applications, evaluate rain or jets, pooling water, condensation, salt exposure, UV, temperature cycling, cable movement and service access separately. The necessary tests and limits should come from the applicable product standard, project specification and qualified engineer—not from a generic claim in this article.

Do not convert IP68 directly into a NEMA enclosure type

IEC IP codes and NEMA enclosure types answer overlapping but different questions. NEMA's official enclosure-type comparison table explicitly says that it cannot be used to convert an IEC classification into a NEMA Type. NEMA Technical Bulletin 123 further explains, for liquid-tight flexible metal conduit and fittings, that NEMA ratings address additional hazards and are not completely equivalent to IP ratings. The article applies that limitation as a procurement principle; it does not extend the bulletin's product-specific conversion table to connectors or other equipment.

Therefore:

• do not change an IP68 supplier statement into “NEMA 6P” in a purchase order;
• do not assume a NEMA Type 4X claim means immersion protection;
• do not accept a conversion chart without its direction, edition, limitations and rated object; and
• for a North American installation, specify the enclosure type, listing and product-standard requirements actually required by the project and authority having jurisdiction.

The safest comparison is two-column, not converted: list the required IEC IP classification and evidence in one column, and the required NEMA/UL enclosure type or other market requirement and evidence in another. A supplier must answer each applicable column directly.

Turn the use case into a water-and-dust specification

Start with exposure, not a preferred digit. A five-step requirement map prevents both under-specification and expensive rating inflation.

1. Describe normal and abnormal exposure

Record where the part will be installed: indoor cabinet, exposed roof, wheel well, deck, splash zone, washdown area, temporary flood zone or continuously submerged location. Separate normal exposure from foreseeable accidents. State whether the product is energized, moving, mated or opened during either condition.

2. Quantify the water challenge

For immersion, define depth or external pressure, duration, frequency, water temperature and product temperature. State whether the water is fresh, salt, chlorinated or contaminated. For spraying, define direction, nozzle or cleaning method, pressure, temperature and chemicals by reference to the applicable standard or customer procedure.

3. Define dust and solid contaminants

Identify dust type, particle size where relevant, conductive or nonconductive nature, expected concentration and whether pressure cycling can draw dust inward. Do not use the first digit as a substitute for a product-specific hazardous-location or conductive-dust assessment.

4. Define the exact operating configuration

List the connector pair, cable, gland, panel, cap, vent, gasket, torque, orientation and operating state. If an enclosure has several openings or variants, include each worst-case configuration or a documented technical rationale for family coverage.

5. Define what happens after exposure

“No visible water” may be either too vague or stricter than the standard’s harmful-ingress criterion, depending on the project. State the required inspection, dielectric, insulation-resistance, continuity, contact-resistance, functional and visual checks. Define any drying time and whether operation is required during or immediately after exposure.

Evidence package for an IP67 or IP68 supplier claim

Ask for an evidence package before price normalization. It should contain enough information to connect the rating to the quoted SKU.

If a supplier presents a UL certification claim, use UL Product iQ to search the file, model or construction and verify its status and scope. A test report, certification, listing and supplier declaration are different evidence types; the RFQ should name the one the project needs.

Sample RFQ wording buyers can adapt

Use controlled language instead of “Need waterproof IP68 connector.” A stronger request is:

Then add the commercial fields that make quotations comparable:

• target country, installation standard and approval route;
• annual and release quantity by exact variant;
• sample quantity and purpose;
• required document language and submission date;
• prototype, testing, tooling, production and transit schedule as separate stages;
• packaging, labeling and lot-traceability requirements;
• record-retention period and retained-sample requirement; and
• quotation validity, Incoterm and a separate list of testing or tooling charges.

Do not ask a supplier to invent a universal minimum order quantity, fixed price or fixed lead time. These depend on the exact construction, evidence scope, sample plan, tooling, order mix and current production conditions.

First-article and incoming controls

A valid historical report can still be disconnected from current production. Close that gap with model-level first-article inspection.

For a connector, inspect housing and seal identification, cable outside diameter, strip and crimp condition, contact insertion, locking, gland position and assembly torque. Record the tool, die, locator and instruction revision. Use the actual production cable and both halves of the intended mating pair.

For an enclosure, inspect cutouts, gasket joints, latch compression, fastener torque, glands, plugs, vents, drains and panel flatness. Confirm that labels and installation instructions state the configuration required to maintain the rating.

Any buyer witness or abbreviated water check should be described accurately. It can detect sample or assembly problems, but it does not recreate a complete IEC 60529 evaluation or create a certification claim. When independent testing is required, approve the laboratory, method, specimen count, configuration and report format before samples ship.

Incoming inspection should focus on variables that affect sealing and identity rather than attempting destructive ingress testing on every lot. A risk-based plan may include dimensional checks, material or seal identification, cable-OD verification, torque audit, visual inspection, periodic ingress verification and traceability review. The engineering owner must set limits and reaction rules.

Change control protects the rating after approval

Require advance written notification for changes to:

• housing, overmold, gasket, O-ring, gland, adhesive or potting material;
• cable supplier, jacket material, outside diameter or conductor construction;
• connector mate, cap, panel thickness, cutout or mounting method;
• mold, cavity, tool, assembly equipment or critical process setting;
• production or test site, subcontractor or laboratory;
• drawing, assembly instruction or test method;
• certification, listing or accreditation status; and
• packaging that could deform a seal before use.

The change request should include the reason, affected part numbers and lots, risk review, validation evidence and proposed effective date. Purchasing should not approve a visually equivalent seal or cable substitution without engineering review. If the tested construction changes, determine whether technical assessment, partial testing or full retest is required.

Common quotation errors and how to correct them

“IP68 means better than IP67 in every way.” Correct it by matching each environmental hazard to its own test. Continuous immersion evidence does not automatically establish jet, corrosion, UV or vibration performance.

“Waterproof to IP68.” Ask for the exact immersion conditions, model and specimen configuration. Replace “waterproof” with the verified degree of protection and its limits.

“All products in this series are covered.” Require a report-to-SKU matrix showing which dimensions, cables, seals and variants were tested or technically covered.

“The connector is IP68 even when disconnected.” Verify whether the report covered the unmated state and which cap was fitted. Many applications need separate requirements for mated operation and service exposure.

“The enclosure is rated, so the completed control box is rated.” Review every field and factory opening plus the final assembly instructions and applicable listing. An empty enclosure’s evidence does not automatically transfer after modification.

“IP68 equals NEMA 6P.” Reject the reverse conversion. Specify and substantiate each designation separately for the target market.

Buyer FAQ

Is IP68 always better than IP67?

No. IP68 addresses a more severe continuous-immersion condition than IPX7, but “better” depends on the exposure. An IP68 claim alone may not address water jets, cleaning, corrosion, UV, thermal cycling or vibration. Compare the full test conditions with the use case.

How deep and how long is an IP68 product protected?

There is no useful universal answer from the digits alone. The conditions are established for the product and must be more severe than IPX7. Obtain the tested depth or pressure, duration, configuration and acceptance results from the supplier’s evidence.

Does IP67 mean a connector is permanently waterproof?

No. IP67 includes a temporary-immersion classification under the applicable test. It is not a permanent-submersion or service-life guarantee and does not cover every fluid, temperature or aged condition.

Does IP68 include IP66 water-jet protection?

Do not assume so. Immersion and jet exposures use different water tests. If both are project hazards, specify and verify both applicable classifications or the product-standard requirements that cover them.

Does a mated connector’s rating apply when it is unplugged?

Only if evidence covers that state, usually with the specified protective cap or sealing arrangement. Ask the report to distinguish fully mated, unmated, capped and panel-mounted configurations.

Can an IP68 label replace a NEMA Type rating?

No. IP and NEMA enclosure type designations have different scopes and cannot be relabeled as equivalents by the buyer. Use the scheme required by the market, installation and applicable product standard.

Is a supplier declaration enough?

It depends on the contract and approval route, but it should never be vague. At minimum, connect the declaration to an exact model, controlled construction, standard edition, test conditions and supporting report. Require independent or accredited evidence when the project specifies it.

What affects the cost of an IP67 or IP68 assembly?

Seal design, material, cable range, tooling, test scope, laboratory evidence, sample count, traceability, inspection, packaging and order mix can all affect cost. Ask suppliers to itemize these assumptions before comparing unit prices.

What affects sample and production lead time?

Separate design review, sample tooling, sample assembly, external testing, report review, corrective action, production and transit. Ask for dependencies instead of accepting a single unsupported date. No universal lead time is stated here.

What should be sent with an ingress-protection RFQ?

Send the application, market, exposure profile, exact mating or mounting configuration, cable and gland data, required IP and enclosure type designations, validation plan, quantities, documentation needs and change-control terms. Photographs and interface drawings help prevent a quote for the wrong configuration.

Send a model-specific RFQ

Use the solar power connector category or connector catalog to identify candidate formats; a catalog title or image is not proof of an IP rating for a project. The PV connector compatibility guide, custom cable assembly RFQ checklist and quality-control process provide related mating, documentation and production-control questions.

Send your connector or enclosure RFQ with the exact application, market, IP67/IP68 condition, mating or mounting state, cable data, quantity and evidence required. SINAWATTS will need to assess the requested model and documentation; this guide makes no claim about certification, test capability, material, stock, price, MOQ or delivery time.

Official and primary sources checked for this guide

All links and source descriptions below were checked on 2026-09-05. The article paraphrases public source summaries and does not reproduce paid standard text.

• IEC 60529:1989+A1:1999+A2:2013 consolidated version, edition 2.2 — official IEC scope, edition and lifecycle listing for degrees of protection provided by enclosures (IP Code).
• NEMA Enclosure Types comparison table — official NEMA table whose title and instructions prohibit reverse conversion from IEC IP classification to NEMA Type.
• NEMA Technical Bulletin 123 — official, product-specific explanation that NEMA and IP systems are not completely equivalent; used here only for that general limitation.
• UL Solutions environmental simulation testing — official laboratory overview distinguishing IEC/EN 60529 water and dust testing from temperature, vibration, UV, salt fog and other environmental evaluations.
• UL Product iQ certification database — official source for checking UL files, models, constructions and certification information.
• Intertek ingress protection testing per IEC 60529 — primary testing-laboratory explanation of the two IP digits and IPX7 temporary versus IPX8 continuous immersion categories.