Technical Specifications
| Property | Unit | Typical Value | Test Method |
|---|---|---|---|
| Appearance | — | Brown red thick liquid | Visual |
| TBN | mgKOH/g | 48 | ASTM D2896 |
| Nitrogen | % | 2.1 | ASTM D5762 |
| Viscosity at 100°C | mm²/s | 300 | ASTM D445 |
| Flash Point | °C | >180 | ASTM D93 |
| Density at 20°C | kg/m³ | 930 | ASTM D4052 |
* Typical values from batch production. Batch-specific COA available on request.
Technical content reviewed by the CheMost additives team · Specifications last reviewed
Molecular Structure
Molecular structure · ashless dispersant (mono)
PIB–succinimidyl · polyamine
A single succinimide group on a polyisobutylene chain, linked through a polyamine — the high-nitrogen polar head that anchors soot and sludge while the oil-soluble PIB tail keeps them dispersed.
What Is Polyisobutylene Monosuccinimide (T1351)?
CheMost T1351 is a polyisobutylene mono-succinimide ashless dispersant, produced by a thermal, chlorine-free process from highly reactive polyisobutylene. “Mono” means a single succinimide group is attached to each PIB chain through a polyamine — distinct from the two-armed bis-succinimides in the rest of the range.
The single, amine-rich head gives T1351 the highest nitrogen (2.1%) and TBN (48 mgKOH/g) in the CheMost succinimide family. That high polar-site density makes it a strong low-temperature dispersant: the head adsorbs onto sludge, varnish precursors and soot while the oil-soluble PIB tail keeps them suspended — without contributing metal or sulphated ash.
How T1351 Works
High-nitrogen low-temperature dispersancy
A high amine content (2.1% N) provides abundant polar sites that latch onto low-temperature sludge and varnish precursors from stop-start and short-trip service, holding them dispersed before they can deposit.
Soot & deposit suspension
The PIB tail keeps captured soot and oxidation by-products finely suspended in the oil, limiting agglomeration, deposits and the viscosity rise it causes.
High-temperature carbon control
Inhibits high-temperature carbon and lacquer formation, helping keep pistons and hot surfaces clean through the drain interval.
Ashless, high N & TBN
Delivers dispersancy with no metal or sulphated ash — suited to low-SAPS formulations — while the mono structure concentrates nitrogen and base in a single, efficient head.
The CheMost Ashless Dispersant Family — Mono / Bis / Borated / HMW
T1351 is the high-nitrogen monosuccinimide of the range. The four recognised succinimide dispersant types differ in nitrogen, molecular weight and boron modification:
| Type | CheMost grade(s) | Distinctive feature | Best for |
|---|---|---|---|
| Monosuccinimide | T1351 | Single succinimide group, high nitrogen (2.1%), TBN 48 | Low-temperature sludge & varnish, gasoline/PCMO |
| Bissuccinimide | T1428 · T1428S | Two succinimide groups; standard & high-N grades | Balanced soot & sludge control, PCMO & HDDEO |
| Boron-modified | T1428B · T1620B | Borated head → antioxidancy, antiwear, seal compatibility | Low-SAPS, GDI/turbo PCMO, seal-sensitive oils |
| High molecular weight | T1620 | Large PIB tail → superior soot dispersancy | High-soot heavy-duty diesel |
Need the two-armed grades? See PIB bissuccinimide (T1428) and HMW PIB bissuccinimide (T1620).
Applications
T1351 is used as the high-nitrogen ashless dispersant component in formulations targeting the categories below.
Passenger-car & gasoline engine oils
Controls low-temperature sludge and varnish from stop-start and short-trip duty, supporting cleanliness in oils targeting API S-category and ACEA gasoline requirements.
Diesel engine oils
Adds high-nitrogen dispersancy to suspend soot and combustion by-products in mixed-fleet and light-duty diesel formulations.
Industrial lubricants
Provides deposit and sludge control where oxidation by-products would otherwise accumulate.
Finished-oil OEM approvals (e.g. API, ACEA and OEM engine-test sequences) are held by the fully formulated oil, not by an individual additive component.
Treat Rate
The T1351 technical data sheet gives a total treat range of 2.0–10.0 wt% to achieve the desired performance. Indicative starting points by application:
| Application | Indicative treat rate |
|---|---|
| Gasoline / passenger-car engine oils | 2–6 wt% |
| Diesel engine oils | 3–8 wt% |
| Industrial lubricants | 2–4 wt% |
In a finished engine oil the dispersant is normally the highest-treat additive — total dispersant content typically runs 3–7 wt%, around half of the whole additive package — so T1351’s level is set together with any co-dispersant. Its high nitrogen makes it an efficient low-temperature dispersant, but very high nitrogen is balanced against fluoroelastomer (Viton) seal compatibility across the dispersant slate.
Indicative starting points within the TDS 2.0–10.0% range, not fixed dosages. T1351 is one component of the additive system; the final treat rate must be confirmed against the soot/sludge load, the co-additive package and the target specification. CheMost can provide formulation and treat-rate support on request.
Formulating With T1351 — Complementary Additives
A dispersant covers contaminant suspension; a balanced crankcase package pairs T1351 with additives that cover the rest of the envelope:
Detergents & TBN boosters
T1351 suspends low-temperature sludge and soot; overbased detergents neutralise combustion acids and clean hot surfaces. The detergent–dispersant balance is the backbone of every crankcase package.
ZDDP antiwear additives
ZDDP adds antiwear protection and secondary antioxidancy; dispersant and ZDDP levels are balanced together, since dispersant can interact with the ZDDP film at metal surfaces.
Antioxidants
Phenolic and aminic antioxidants slow the oxidation that forms sludge — working alongside the dispersant’s deposit control.
Borated dispersants
Where extra antioxidancy, antiwear or seal compatibility is needed, a borated grade such as T1428B can complement or partly replace T1351 in the dispersant slate.
Documentation, Qualification & Regulatory Support
Standard documentation — Certificate of Analysis (COA, per shipment), Technical Data Sheet (TDS) and Safety Data Sheet (SDS, GHS/CLP) — is provided. The full TDS is available on request rather than as a public download. Additional support is available on request:
Regulatory documentation
REACH, TSCA and country-specific market-registration documentation support available on request.
Third-party inspection
SGS / Intertek / BV pre-shipment inspection can be arranged on request.
Custom grades & packaging
Custom grades and packaging — metal drum, IBC, ISO tank.
Formulation support
Treat-rate calculation and formulation guidance from our technical team.
Packaging & Supply
T1351 is stocked and shipped worldwide, with a typical lead time of 1–15 days and a 36-month shelf life at ambient temperature. Samples and quotations are answered within 12 hours.
Packaging
170 kg metal drum · 900 kg IBC tank.
Minimum order
1 drum or 1 IBC — no minimum order value.
Incoterms
FOB · CIF · EXW, to suit your freight arrangement.
Loading ports
All major Chinese ports.
Frequently Asked Questions
What is polyisobutylene monosuccinimide (T1351)?
It is an ashless (metal-free) dispersant in which a single succinimide group is attached to a polyisobutylene chain through a polyamine, made by a chlorine-free thermal process. The single amine-rich head gives high nitrogen (2.1%) and TBN (48 mgKOH/g), making it a strong low-temperature sludge and varnish dispersant.
What is the difference between mono- and bis-succinimide dispersants?
A monosuccinimide has one succinimide group per PIB chain; a bis-succinimide has two, bridged by a polyamine. Mono grades like T1351 tend to carry higher nitrogen and TBN per molecule and excel at low-temperature sludge/varnish control; bis grades (e.g. T1428, T1620) offer broad soot dispersancy and are often chosen for diesel.
Why is the chlorine-free process important?
T1351 is made by a chlorine-free thermal route, avoiding residual chlorine in the finished additive — consistent with the industry trend toward low-chlorine lubricant additives. A full SDS is provided with the documentation.
What treat rate should I use for T1351?
The TDS gives a total range of 2.0–10.0 wt%. The right level depends on the soot/sludge load, the co-additive package and the target specification; our technical team can assist with the calculation.
How is T1351 supplied, and how fast can I get a sample?
T1351 is supplied in 170 kg metal drums and 900 kg IBC tanks and shipped worldwide, with a 36-month shelf life. As a manufacturer and sourcing partner (Est. 2013), CheMost responds to sample and quotation requests within 12 hours.