Machine Design

Nylon makes connectors strong, stiff, and tough

NuChannel Fakra SMB connectors must be robust enough to withstand pullout forces on the order of 110 N without disconnecting.

Rugged Fakra connectors rely on DuPont Zytel nylon for strength, toughness, and dielectric performance.


The connectors from the Electronic Components & Materials div. of Osram Sylvania, York, Pa. (sylvania.com), work with antennas for automotive radios, cell phones, and telematic systems such as keyless remote entry, global positioning, and tire-pressure monitoring.

The connector body is a 43% glass-reinforced nylon 6/6 called Zytel 70G43L from DuPont Engineering Polymers, Wilmington Del. (plastics.dupont.com). The nylon gives the connectors strength, stiffness, and toughness. It molds to precision tolerances of ±0.0005 in. (±0.013 mm) and is considered to have good mold-release properties.

A key component of the NuChannel connector is an internal insulator for its signal conductor. It is molded from Zytel 408, an unreinforced nylon 6/6 grade. The material's low dielectric constant at high frequency is crucial to minimize signal loss. It's also report-edly easier to mold and less costly than competitive fluoropolymers.

MATERIAL PROPERTIES

Property

Dry as molded

50%RH

Stress at break, kpsi
31.9
22.5
Tensile strength
40°F, kpsi
36.5
_
73°F, kpsi
30
21
170°F, kpsi
17.5
10.5
Strain at break, %
3
4
Elongation at break,
2
3
Izod impact, ft-lb/in.
2.5
3.5
Heat-deflection temperature (66 psi),
°F 500
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