White lithium grease is a versatile lubricant commonly used in industrial and household applications. It is widely manufactured by brands such as Petronas and Morris; but when it comes to rubber components, white lithium grease may not be suitable.
This article looks at the compatibility of white lithium grease and rubber, focusing on the effects, the alternatives and when it is appropriate to use this particular type of lubricant.
Harmful effects of white lithium grease on rubber
White lithium grease contains petroleum-based oils that can be damaging to rubber materials.
The petroleum in the grease can break down rubber over time. This is a process called chemical degradation, which causes rubber to swell, soften and eventually deteriorate.
The result of the process outlined above can be loss of elasticity and flexibility in rubber seals and gaskets, premature cracking and splitting of rubber components, reduced lifespan of rubber parts and potential system failures caused by the degradation of rubber seals.
This degradation doesn’t happen immediately. It occurs gradually with continued exposure – consequently, in some cases, damage may go unnoticed until significant problems develop.
Better alternatives for lubricating rubber
When the lubrication of rubber components is required, silicone-based lubricants are generally considered safer alternatives.
These products offer several advantages when used with rubber, including; chemical compatibility with most rubber compounds; the ability to preserve rubber’s natural elasticity and properties; water resistance that helps protect rubber from moisture damage; and long-lasting performance without causing material breakdown.
Other rubber-safe options include PTFE (polytetrafluoroethylene, or ‘Teflon’) lubricants and specialised rubber conditioners designed specifically for rubber maintenance.
When to use white lithium grease
While not ideal for rubber, white lithium grease is suitable for many other applications. It can be used on metal-on-metal contact points, for example, such as door hinges and locks. It is suitable for mechanical assemblies operating under high pressure or load, and it is also an option for applications requiring temperature resistance (effective from -28°C to 170°C).
For these applications, white lithium grease offers lubrication, corrosion protection and longevity.
Choosing the right lubricant for each material
When maintaining mechanical components, it’s always important to choose the right lubricant for the material.
For rubber parts, silicone-based lubricants offer the best protection, while also preserving rubber integrity. White lithium grease can be used to lubricate metal components that will benefit from its properties without risking damage.
