בודק תאימות חומרי סיכה

The most common result is that the mixed grease becomes either too soft (runs out of the bearing, causing starvation) or too hard (won't flow, causing overheating). Either way, the bearing is not properly lubricated and will fail prematurely.

Polyurea greases are generally only compatible with other polyurea greases. They are incompatible with most soap-based thickeners (lithium, calcium, sodium, etc.). This is important because polyurea is increasingly popular for "sealed-for-life" bearings.

Mineral + PAO (synthetic) is generally fine. Mineral + ester is usually OK. Mineral + silicone is NOT compatible. However, thickener compatibility is usually more critical than base oil compatibility.

Check the grease technical data sheet (TDS) or safety data sheet (SDS) from the manufacturer. The thickener type is always listed. Common identifiers: Lithium 12-hydroxystearate, Polyurea, Aluminum complex, etc.

NLGI grade (consistency) differences don't affect chemical compatibility. A NLGI 2 lithium grease is compatible with NLGI 3 lithium grease. However, the resulting consistency will be somewhere in between.