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Polyurethane molding for cable terminiations
Polyurethane over-molding is the most commonly used technique for sealing a cable to a connector.
Advantages of using Polyurethane
- Easy to work with
- Simple set up and tooling
- Inexpensive molds since Polyurethane is a castable material
- Easy to cast into a variety of shapes and configurations
Risks with Polyurethane
- Water absorption over time - electrical property degradation
- Bond delamination over time - limits service life to less than 10 yrs
- Temperature Limits - 165°F with standard materials
- UV sensitivity
- Bubble entrapment if proper technique not used - leads to premature failures; requires technician with good working knowledge
- Cable jacket violation could cause loss of electrical function.
Life
- If standard primers are used, 5-10 years
- Longer life requires special coatings be applied to metal plug shells to block bond delamination:
- NCC - Non-Cathodic Coating: developed by the US Navy and governed by Navy Molding Manual Specifications
- DGO-1 Proprietary primer (factory applied)
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Teledyne D.G.O’Brien reliability at a glance
- Start with a detailed understanding of your application
- Leverage historical proven designs to reduce risk
- Rigorous standardized processes
- Use FMEA to define risk area
- Qualification testing that exceeds customer requirements
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Make Teledyne D.G.O’Brien your R & D department
We'll help you determine what you need, and make it. Or we'll help you make sure your specification matches what you really need. Click here to read about our engineering services.
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Teledyne D.G.O’Brien facilities
Teledyne D.G.O’Brien staffs complete, in-house facilities and capabilities in these technical areas:
- Glass sealing and heat treating
- Precious metal plating
- Fiber optic terminations and testing
- Machining
- Welding and NDT
- Molding and assembly - Polyeurathane, Polyethylene, Neoprene, DAP, GRE
- Quality control & inspection
- Qualification testing
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