Compare cable gland plastics by the exact compound, moisture condition and component function. PA6, PA12, PBT, PPE/PPO, PPS, PEEK and PVDF identify different polymer families. I use the family name to understand the chemistry, then compare the actual grade in the condition and component where it will be used.
A useful comparison starts with the component’s job. A gland body must hold its threads and sealing geometry; a flexible seal must maintain contact; a vent membrane must pass gas through its intended structure. Compare the properties that support that function at the actual temperature, moisture state and exposure.
Key takeaways
- Compare exact grades, including fillers, blend partners, stabilizers and color.
- Align moisture conditioning and test conditions before comparing property values.
- Check the molded thread, sealing seat or flexible feature that carries the load.
- Evaluate the body with its seal, cable and enclosure entry.
Decode the name before comparing properties
The base polymer, commercial compound and finished component are distinct identities. Reinforcement, blend partners, stabilizers, pigments and processing are part of the supplied material specification. “Black engineering plastic” leaves almost all of that information open.
| Name | Material identity | First distinction I clarify |
|---|---|---|
| PA6 | Polyamide 6, one member of the nylon family | Exact compound and moisture condition |
| PA12 | Polyamide 12, another nylon family member | Grade, modification and represented conditioning |
| PBT | Polybutylene terephthalate, a thermoplastic polyester | Reinforcement and hydrolysis-stabilized formulation |
| PPE / PPO | Polyphenylene ether, also encountered under the PPO name | Base polymer versus the actual modified blend |
| PPS | Polyphenylene sulfide | Compound, reinforcement and process-dependent part geometry |
| PEEK | Polyetheretherketone, within the PAEK family | Unfilled or filled grade and the particular high-duty requirement |
| PVDF | Polyvinylidene fluoride, a fluoropolymer | Exact formulation and component form |
These names are a map for reading the technical data, not a list of interchangeable materials. Preserve the supplier’s full compound designation and drawing revision alongside the familiar abbreviation. A replacement that keeps the same family letters can still change the formulation.
Compare PA6 and PA12 in the represented moisture state
PA6 and PA12 are both polyamides, but they are different base polymers. Autodesk’s original molding-material documentation identifies PA6 as nylon 6 and PA12 as nylon 12. Its guidance discusses moisture effects, reinforcement and grade-dependent molding behavior. Those distinctions frame a comparison; the generic processing guidance does not replace the selected compound’s instructions.
PA6 offers useful toughness, strength and abrasion resistance, while PA12 generally takes up less moisture than PA6 and PA66. That makes PA12 worth considering when humidity-driven dimensional change affects a thread or sealing seat. I then compare the actual compounds: reinforcement can change stiffness, and the selected grade still needs to carry the component’s load.
For a fair comparison, align the filler, specimen, method, temperature and moisture condition. A dry, unfilled PA6 result and a conditioned, reinforced PA12 result combine several changes. Request comparable results before attributing the gap to the base polymer.
ISO 62:2008 describes controlled water-absorption measurements on defined plastic specimens. A short immersion value, a humid-air equilibrium value and a dimension measured immediately after molding describe different conditions. Ask which one matters to your entry: dry assembly, humid service, immersion, or a transition between states.
For a molded thread or sealing seat, compare the feature’s dimensions and behavior in the relevant state. The nylon cable gland guide connects those properties to the complete gland. I shortlist PA6 or PA12 by the compound’s response to the actual duty, with moisture absorption as one part of that choice.
Read PBT, PPE and PPS as separate housing candidates
PBT is a polyester with low moisture uptake and useful stiffness and electrical insulation properties. Those traits make it a candidate for a rigid housing. Autodesk’s PBT molding-material guidance also describes its sensitivity to hydrolysis at high processing temperatures. I check resin drying and molding controls, then assess warm, damp service separately. For that duty, compare retained properties after relevant aging, including the exact grade if hydrolysis resistance is a selection reason.
PPE/PPO materials are commonly blends that improve the processing of the base polymer. Autodesk’s original molding-material documentation describes blends with polystyrene and polyamide. The blend partner changes the comparison: its nylon blends can improve chemical resistance, while the composition and reinforcement affect dimensions and processing. I retain the full blend and grade when comparing a housing, especially where thread fit must remain stable through temperature and humidity changes.
PPS is polyphenylene sulfide. The public scope of ISO 20558-1:2018 distinguishes PPS materials by defined properties, processing information, additives and reinforcement, and explicitly separates a designation from application performance. That makes the full compound identity useful when evaluating a housing. A molded thread or sealing seat still needs relevant load and dimensional evidence; the three-letter family name cannot supply it.
For all three, start with the component function. Electrical insulation, flame behavior at the actual thickness, impact response, sustained load, humid heat and molding quality may demand different evidence. It is more informative to ask which candidate meets those defined requirements than to arrange the three abbreviations on a single “best plastic” ladder.
Give PEEK and PVDF a specific job
PEEK belongs to the polyaryletherketone family, as NASA’s materials overview identifies. I consider a PEEK candidate when a defined thermal, mechanical or chemical requirement merits investigating a suitable grade. The next comparison still concerns the actual filled or unfilled material, processing route, part dimensions and exposure.
PVDF means polyvinylidene fluoride; the National Library of Medicine’s controlled vocabulary identifies the name and places it among fluorocarbon polymers. The next distinction is the supplied formulation and component form. A porous membrane and a dense molded threaded body can have different structures and functions even when both records name PVDF. The abbreviation alone does not transfer a membrane’s behavior to a body.
For vacuum or cleanliness-sensitive use, ask which material, processing state and cleaning history were tested. The outgassing guide explains the relevant comparison. For repeated sterilization, the vent-plug material guide keeps method, cycle and complete construction together. Neither “PEEK” nor “PVDF” by itself supplies that application evidence.
For either family, identify the component you need first: a threaded body, a seal support or a membrane. Then compare available grades and finished components for that function. This keeps the cost and processing demands of a specialist polymer tied to a specific benefit.
Keep the formulation and test conditions beside each value
Arrange the comparison in one row per candidate, leaving an unsupported field open. This prevents an impressive property measured on one specimen from quietly becoming a complete-product rating.
| Comparison field | What I keep in the record | Why it matters |
|---|---|---|
| Compound identity | Producer, grade, blend, filler and color | Connects the value to what will be supplied |
| Specimen condition | Dry/conditioned state, time and temperature | Makes moisture and temperature comparisons meaningful |
| Mechanical result | Method, loading direction, rate and duration | Short-term stiffness and sustained-load behavior answer different questions |
| Electrical or flame result | Test method, thickness, color and formulation | Limits the claim to its represented specimen |
| Chemical exposure | Fluid, concentration, temperature, duration and stress | Separates a brief compatibility screen from the intended duty |
| Manufacturing condition | Molding or machining route and critical feature condition | Connects material data with threads, seats and flexible features |
Consider two hypothetical candidates offered as “glass-filled PBT” for the same body in a warm, damp enclosure. One identifies a hydrolysis-resistant grade and gives results after relevant aging; the other gives only an initial tensile value. I compare the initial strength values after matching the method and specimen condition. For service, the useful comparison is retained strength and dimensional behavior after the same warm, damp exposure. Include the molded thread and sealing seat, because those features must still assemble and hold their shape. If the second candidate has no comparable aging result, request that result or evaluate a sample under agreed conditions before selecting it for this duty. The lower-priced compound remains a candidate while that specific question is resolved.
The same reasoning applies to color and additives. A black part does not identify its UV stabilization package. A fiber-filled test specimen does not reveal the fiber orientation at a molded thread or weld line. Ask for the property that answers the actual component question.
Compare cable gland plastics in the molded part
A concise material decision should explain why the candidate remains suitable after its data are connected to the component. Record the proposed grade, represented condition, critical dimensions and the function those dimensions support. For example, a sealing seat needs appropriate shape and surface condition, while a clamping feature must work through the documented assembly movement.
Then evaluate that part with its specified seal, cable and enclosure entry. A body-material improvement can leave the seal as the controlling temperature or fluid-compatibility limit. Use the same cable construction, accessories and assembly conditions when comparing alternative bodies so that a material change is not confused with a different entry design.
A useful selection note can be short: identify the grade, state why it was shortlisted, and record the relevant property and assembly results. Include any remaining check, such as conditioned thread fit or seal compatibility, so the next decision concerns the feature that matters.
Conclusion
I narrow the material choice by the feature that needs protection. For a thread affected by humidity, compare conditioned dimensions of the PA6 and PA12 candidates. For a rigid PBT housing in warm, damp service, compare retained properties after aging. With PPE, retain the blend identity; with PPS, PEEK or PVDF, tie the proposed grade to a specific component requirement.
Keep the actual compound and test conditions beside the property, then connect that evidence with the molded part and complete entry. A well-defined material choice is more useful than a family ranking because you can reproduce it when a supplier, formulation or service condition changes.
FAQ
Is PA12 always a better cable gland material than PA6?
No. They are different polyamide families, and the appropriate choice depends on the actual compound, conditioning, component and duty. I would compare aligned moisture, mechanical and dimensional evidence, then assess the complete entry. A favorable family-level characteristic does not override a mismatched seal, unsupported load or inadequate molded feature.
Are PPE and PPO different grades?
The names are commonly used for the polyphenylene ether material family, but neither specifies a finished commercial compound. In practical selection, the blend partner, filler, additives and grade are more informative. I retain the supplier’s exact designation and avoid treating all materials described as modified PPO or PPE as equivalent.
Can a PEEK or PVDF body establish the whole gland’s temperature rating?
No. The body is only one component. The seal, cable jacket, accessories, geometry and documented assembly performance can establish a different usable boundary. I would compare the relevant part and complete-entry evidence at the required conditions rather than copy the resin’s advertised thermal characteristic into a product rating.
What should I compare when two data sheets use different conditioning states?
First identify the moisture condition, temperature, specimen and method behind each value. Request comparable results where the difference matters to the decision. Do not apply a guessed correction factor. For critical threads or sealing seats, include dimensions and functional behavior of the actual parts in the relevant conditions.
Sources and technical references
- Autodesk — PA6 materials, accessed 2026-10-28.
- Autodesk — PA12 materials, accessed 2026-10-28.
- SIS — SS-EN ISO 62:2008: Determination of water absorption, accessed 2026-10-28.
- Autodesk — PBT materials, accessed 2026-10-28.
- Autodesk — PPE materials, accessed 2026-10-28.
- EVS — ISO 20558-1:2018: PPS designation system, accessed 2026-10-28.
- NASA — Small Spacecraft Technology: Structures, Materials, and Mechanisms, accessed 2026-10-28.
- National Library of Medicine — Polyvinylidene fluoride, MeSH record C024865, accessed 2026-10-28.