Impregnation Oil for BP25 & FP20 — TURBO T100

An oil-impregnated sintered bushing works because roughly 20–25% of its wall volume is open, interconnected porosity that behaves as a distributed oil reservoir. TURBO T100 is the fluid that fills this network. At rest, surface tension holds the oil inside the pores. When the shaft turns, two effects release it: frictional heat causes the trapped oil to expand more than the surrounding metal skeleton, and the local pressure and shear at the contact draw a microscopic film to the running surface. This builds a hydrodynamic-to-boundary lubricating film without any external oiler, grease nipple, or maintenance cycle — the defining feature of a self-lubricating bearing.

When motion stops and the bearing cools, capillary action reverses the flow and the oil is re-absorbed back into the porosity, ready for the next start. TURBO T100's low viscosity is deliberately chosen so it can move freely through the fine, tortuous pore channels of BP25 bronze and FP20 iron — both to re-fill them during impregnation and to feed the interface reliably at low speeds and on start-up, where a heavier oil would be too sluggish to reach the contact in time.

TURBO T100 is applied to the bushing, not to a mating part, and the goal is always to fill the porosity — not merely to wet the surface. Choose the method to suit the situation.

• Vacuum re-impregnation (most thorough): submerge the cleaned, dry bushings in the oil and draw a vacuum to evacuate air from the pores, then release to atmosphere so the oil is forced into the evacuated network. Heating the oil moderately lowers its viscosity and speeds penetration.
• Hot-soak method: immerse the bushings in TURBO T100 held warm for an extended period; rising temperature expels pore air and draws oil in as the parts cool. Less complete than vacuum but effective for top-ups.
• In-service top-up: apply the oil to the exposed bearing surface and any accessible end faces and allow it to wick in; repeat until the surface stays visibly oil-fed.

Handling: keep the oil, containers, and bushings clean and free of grit — a sintered bearing cannot be flushed, so contamination trapped in the pores is permanent. Do not thicken or dilute the oil with greases or solvents, and do not substitute a heavier oil, as this defeats the capillary feed. Wipe external surfaces after impregnation, store the 1 litre container sealed and cool, and observe the safety-data-sheet guidance for a mineral oil.

Choose TURBO T100 when your self-lubricating bearings are BP25 sintered bronze or FP20 sintered iron and you need a low-viscosity fluid to re-establish their internal oil charge — either as a batch re-impregnation during overhaul or as an in-service top-up. It is the correct default for general-purpose, ambient-temperature maintenance of these two materials. If your application involves a markedly different regime — for example very high or very low temperatures, food-contact requirements, or bushings made from a different matrix such as the SO16 alloy or Metagliss composite range — request the impregnation oil specified for that material and duty instead, rather than forcing a mismatch. The 1 litre pack suits workshop and field maintenance; for high-volume production re-impregnation, ask about bulk supply.