Case Study - Advanced Fretting Protection for Underhood Connectors
Background
Underhood connectors are exposed to micromotion vibration and/or thermal expansion due to heating or cooling cycles. These micromovements, known as fretting corrosion, wear down through the metal coatings into the base material and promote oxidation. The formation of this oxide layer can result in power failure or signal loss. A prominent Automotive OEM came to Nye in search of a grease that would protect their water pump connectors against fretting corrosion and ensure lasting, reliable connections.
Challenge
Can the grease protect against fretting while withstanding high underhood temperatures?
Solution
Rheotemp™ 769G
A polyurea thickened, medium viscosity, synthetic hydrocarbon grease
- Fretting protection up to 18.7M cycles
- Wide temperature protection up to 175°C.
- Resists moisture
- Provides lifetime lubrication for lasting connections
| Typical Properties | Rheotemp™ 769G | Test Methods |
|---|---|---|
| Chemistry | PAO/Alkylated Naphthalene | - |
| Temperature Range | -40 to 175 °C | - |
| Kinematic Viscosity (40 °C) | 66 cSt | ASTM D445 |
| Viscosity Index | 134 | ASTM D2270 |
| Water Washout (1 h, 80 °C) | 1.6% | ASTM D1264 |
| Salt Spray Resistance (750 h) | No Corrosion | ASTM B117-18 |
| Dielectric Breakdown Voltage | 28.7 KV | CTM |
Results
Nye sent the customer samples of several of our leading connector greases. For most connector applications, Nye recommends NyoGel® 760G. But for applications see temperatures above 135°C and must withstand more than 6.7M fretting cycles, an advanced grease is often recommended. After comparing our data with their in-house testing, the OEM decided to go with Rheotemp™ 769G as it offers the highest fretting protection of any grease offered at Nye and can withstand the temperatures of their application.
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