A hermetically sealed connector is intended to limit gas leakage through a barrier; an environmentally sealed connector is intended to resist specified conditions such as dust or water ingress. Those are different performance goals, so an IP rating does not establish a helium leak rate, and a hermetic leak claim does not establish a general environmental rating. Choose against the hazard and acceptance test that matter at the connector’s actual boundary.
What each type of seal is designed to do
Hermetically sealed: control gas leakage
Glenair describes hermeticity as the condition of being air- or gas-tight. In connector applications, the goal is to prevent gas from passing through a connector barrier, often where the connector penetrates a pressure or vacuum boundary. This is a manufacturer’s description, not a universal acceptance threshold; the required leak limit and test method must come from the applicable product specification. Glenair’s hermetic overview
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Environmentally sealed: resist specified exposure
An environmentally sealed connector is designed and qualified for stated environmental conditions, such as dust or water ingress. The applicable IP level or other environmental qualification describes the particular exposure and test; it does not, by itself, establish gas-tightness across a pressure boundary.
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| Question | Hermetic connector | Environmentally sealed connector |
|---|---|---|
| Primary concern | Gas leakage across a barrier, including a vacuum or pressure boundary. | Ingress or exposure such as water and dust, as defined by the product’s rating or qualification. |
| Relevant evidence | A specified leak-rate limit and its test method for the exact configuration. | An IP rating or other stated environmental test and qualification. |
| What the designation does not prove | That every mated interface or mounting arrangement is gas-tight, or that the connector has a particular IP rating. | That the connector meets a specified gas-leak limit or preserves vacuum or pressure. |
The metrics are not interchangeable scales. A helium leak-rate value answers a gas-leakage question; an ingress rating such as IP67 addresses specified environmental ingress. Glenair describes IP67-level sealing for environmental versions and gives a helium leak-rate claim for its hermetic family, but those claims apply to the referenced products, not to every connector of either type. Glenair hermetic connector material
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Why connector construction and seal location matter
A connector may have several distinct sealing interfaces: the insert or feedthrough barrier, the connector-to-panel mounting interface, and the mated plug-and-receptacle interface. A hermetic feedthrough does not automatically make the mated pair gas-tight. Likewise, a seal at the mating interface does not establish that gas cannot leak through the connector body or mounting boundary. Identify the boundary that must hold, then verify that the specific contacts, insert, mounting hardware, and mating accessories are qualified for it.
In its MIL-DTL-38999 scope, the Defense Logistics Agency distinguishes environment-resistant connectors with removable crimp contacts from hermetically sealed connectors with fixed, solderable contacts. The specification also encompasses multiple mating styles. These are different configurations within a connector family, not interchangeable variants simply because they share a family name. DLA MIL-DTL-38999 record DLA ASSIST
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When to specify each type
Specify hermetic performance when gas leakage is the governing risk
Consider a hermetic connector when a feedthrough crosses a vacuum or pressurized enclosure and leakage through that boundary must stay below a defined limit. Glenair cites geophysical, medical, and military aerospace applications as examples where hermetic connectors may be used; the application name alone does not prove that every system in that field needs one. Set the required leak rate and test method from the system requirements and the connector’s controlling specification.
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For outdoor, wet, dusty, or otherwise exposed equipment, identify the actual environmental conditions and select a connector with an applicable rating or qualification for those conditions. If the design also has a pressure or vacuum boundary, confirm gas leakage separately rather than assuming the environmental rating covers it.
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How to choose and verify a connector
- Define the boundary and hazard. State whether the requirement concerns gas crossing a pressure boundary, water or dust ingress, or both. Identify whether the critical interface is the feedthrough, panel mount, or mated pair.
- Set the acceptance metric. For hermeticity, specify the leak-rate limit and test method. For environmental sealing, specify the required IP level or other applicable environmental tests. Do not substitute one measure for the other.
- Check the exact configuration. Verify series, shell style, contact arrangement and type, mounting, coupling, temperature and vibration requirements, and qualification status against the current datasheet and controlling detail specification.
- Confirm which parts of the assembly are covered. Check whether the stated performance applies to the connector body alone, its panel installation, the mated interface, or the complete assembly with accessories.
- Use current, configuration-specific evidence. A family description or catalog figure is not enough if the selected part, test conditions, or acceptance criteria differ. Obtain the current specification for the exact part before design approval or purchase.
What the published figures do—and do not—tell you
Glenair’s cited catalog material states a helium leak rate of 1 × 10⁻⁷ cm³/s for its described hermetic variants and IP67-level sealing for its environmental versions. The indexed page does not establish a publication date; the cited catalog materials carry a 2010 copyright. Treat these as manufacturer claims for the product family described, not universal definitions or requirements. Confirm the exact part, current datasheet, test method, and acceptance criteria before applying either figure. Glenair product material
A different Glenair catalog context reports a different leak-rate figure, another reason not to treat a single number as a universal hermetic threshold. The limit that controls a design is the one specified for its required connector configuration and verification method. Glenair hermetic catalog
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Use the controlling specification, not just the family name
The DLA listing identifies MIL-DTL-38999 Revision N, dated July 27, 2026, and describes both environment-resistant connectors with removable crimp contacts and hermetically sealed connectors with fixed, solderable contacts. Check the applicable series and detail sheet for contact type, mounting, coupling, and verification requirements. The specification is a useful example of the two categories coexisting within one family; it does not mean that every configuration satisfies the same application requirements. DLA MIL-DTL-38999 record
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