Polyisobutylene Succinimide (Mono-type)
Mono-type polyisobutylene succinimide (PIBSI) — an ashless dispersant that suspends sludge, soot and deposit precursors, with the mono structure giving good low-temperature dispersancy and seal compatibility.
The ashless dispersant that keeps contaminants suspended
Dispersants are the part of an engine oil that holds sludge, soot and oxidation products in fine suspension so they cannot agglomerate into harmful deposits.
Mono-type polyisobutylene succinimide (PIBSI) is an ashless dispersant built from a polyisobutylene (PIB) tail attached to a polyamine head through a single succinimide linkage. The PIB tail keeps it oil-soluble while the polyamine head latches onto sludge, soot and deposit precursors, holding them in fine suspension. The mono structure (one PIB chain per molecule) gives good low-temperature dispersancy and seal compatibility, making it valuable where these properties matter. Dispersants are typically the largest additive component by mass in an engine oil and are used with detergents to keep engines clean.
Polyisobutylene Succinimide (Mono-type) — typical properties
Representative typical values for mono-type PIBSI dispersant. Indicative only — exact values vary by grade and are confirmed on the TDS and batch COA.
| Property | Typical Value | Method / Note |
|---|---|---|
| Appearance | Amber to brown viscous liquid | Visual |
| Total Base Number (TBN) | ~15–40 mg KOH/g | ASTM D2896 · grade-dependent |
| Nitrogen content | ~1–2 wt% | Polyamine head |
| Kinematic viscosity (100°C) | ~150–500 mm²/s | ASTM D445 |
| Flash point (COC) | > ~170 °C | ASTM D92 |
| Density (15°C) | ~0.9–0.95 g/cm³ | Typical |
| Structure | Mono-succinimide | One PIB chain |
Typical values for guidance only — not a specification. Request the TDS for the specific grade you need; the COA reports actual measured values for your batch.
Where mono-type PIBSI dispersant is used
Passenger Car Engine Oils
Suspends sludge and deposit precursors for clean PCMO. See engine oil additives.
Low-Temperature Sludge Control
Mono structure gives good cold-sludge dispersancy.
Seal-Sensitive Formulations
Lower nitrogen coupling supports elastomer seal compatibility.
Detergent-Dispersant Systems
Works with detergents to keep engines clean over the drain interval.
Why formulators choose mono-type PIBSI dispersant
Effective sludge dispersancy
Holds sludge, soot and oxidation products in fine suspension, preventing deposits.
Good low-temperature performance
Mono structure supports cold-sludge control in stop-start service.
Seal compatibility
Mono coupling helps balance dispersancy against elastomer seal protection.
From sample drum to ISO tank
Sinolook supplies mono-type PIBSI dispersant at any scale, from formulation samples to commercial bulk, to over 60 countries.
Frequently asked questions
What is PIBSI dispersant used for?
What is the difference between mono and bis succinimide?
Why are dispersants called ashless?
How much dispersant is used in engine oil?
Can Sinolook provide TDS, MSDS and COA?
Request mono-type PIBSI dispersant from Sinolook
Tell us your target grade, application and volume — we'll send the TDS, a batch COA and a delivered quotation within 24 hours.
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