Technical Specifications
This grade family is available as 2 CheMost grades — the differences are in the columns below.
| Property | Unit | T1428B | T1620B | Test Method |
|---|---|---|---|---|
| Appearance | — | Brown red thick liquid | Brown red thick liquid | Visual |
| TBN | mgKOH/g | 28 | 21 | ASTM D2896 |
| Nitrogen | % | 1.25 | 1.10 | ASTM D5762 |
| Boron | % | 1.0 | 0.95 | ASTM D4951 |
| Viscosity at 100°C | mm²/s | 280 | 350 | ASTM D445 |
| Flash Point | °C | 205 | 210 | ASTM D93 |
| Density at 20°C | kg/m³ | 930 | 930 | ASTM D4052 |
| Color | — | 2.5 | 2.5 | ASTM D1500 |
| Moisture content | % | 0.03 | 0.03 | ASTM D95 |
| Mechanical impurities | % | 0.03 | 0.03 | ASTM D473 |
* 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 · borated ashless dispersant
[(PIB–succinimidyl)₂ · polyamine] · B
A bis-succinimide (two succinimide groups per polyamine bridge) modified with boron — boron bonded into the polar head adds antioxidancy and antiwear function on top of the dispersancy.
What Is Boron-Modified Polyisobutylene Succinimide?
CheMost boron-modified (borated) polyisobutylene succinimide is a chlorine-free, ashless dispersant in which boron is bonded into the polar head of a PIB bis-succinimide backbone. Boration turns a straight dispersant into a multifunctional one: besides suspending soot and sludge, the boron contributes antioxidancy, antiwear film formation and improved fluoroelastomer-seal compatibility — all while staying ashless and metal-free, which suits modern low-SAPS engine oils.
Boration is a recognised dispersant post-treatment. High-nitrogen dispersants can stress fluoroelastomer seals; reacting the dispersant with boric acid ties up the seal-aggressive free amine and low-molecular-weight species, improving seal compatibility and hydrolytic stability while adding oxidation and wear resistance. The trade-off is that boration slightly lowers raw sludge dispersancy, which is why CheMost offers two borated grades on different molecular-weight backbones.
CheMost supplies the borated succinimide as T1428B (standard molecular weight, 1.0% boron) and T1620B (high molecular weight, 0.95% boron). Both share the borated chemistry; the Technical Specifications above list both grades side by side, and the guidance below explains which backbone fits.
Choosing Between T1428B and T1620B
Both grades are borated PIB succinimides (full numbers in the Technical Specifications above); they differ in the molecular weight of the PIB backbone, which sets soot-dispersancy strength and viscosity. T1428B is the standard-molecular-weight borated grade — the balanced low-SAPS workhorse for PCMO, GDI/turbo, gas-engine and industrial oils (treat 2.0–4.0 wt% in engine oils). T1620B puts the same boron benefits on a larger PIB backbone, recovering the soot-dispersancy strength that boration alone would temper, for high-soot diesel and low-emission oils (treat 1.0–4.0 wt%); it should be handled at no more than 75 °C and stored below 45 °C.
For the non-borated backbones, see PIB bissuccinimide (T1428) and HMW PIB bissuccinimide (T1620).
How Boration Works
Soot & sludge dispersancy
The bis-succinimide head adsorbs onto soot, sludge and oxidation by-products; the PIB tail keeps them suspended, preventing the agglomeration that drives deposits and oil thickening.
Boron antioxidancy
Boron is a recognised ashless antioxidant route; in a borated dispersant it helps slow oil oxidation, extending useful oil life and complementing the primary antioxidant system.
Antiwear & boundary support
Boron contributes boundary-film/antiwear character — a recognised benefit of borated dispersants that can support the ZDDP/antiwear system rather than replace it.
Seal compatibility, low ash
Borated dispersants are valued for improved fluoroelastomer-seal compatibility and hydrolytic stability; being ashless, they add this functionality without raising sulphated ash — useful under emissions-driven low-SAPS limits.
Applications
The borated succinimide grades are used as the borated ashless dispersant component in formulations targeting the categories below; the high-MW T1620B is favoured where soot loads are highest.
Low-SAPS passenger-car oils
Adds dispersancy plus boron antioxidancy and seal compatibility without sulphated ash, supporting cleanliness in oils targeting API S-category and ACEA C-category low-SAPS limits — including GDI and turbocharged engines.
Heavy-duty diesel engine oils
Disperses high soot loads while the boron contributes oxidation resistance, supporting formulations targeting API CK-4/FA-4 and ACEA E-categories. T1620B’s high-MW backbone suits the highest-soot duty.
Gas-engine & industrial oils
Where deposit control with added oxidation resistance is needed in high-temperature, clean-burning duty.
Boron contributes to oxidation and wear control as part of a balanced package; copper/lead corrosion and the co-additive balance should be confirmed in the finished oil. Finished-oil OEM approvals are held by the fully formulated oil, not an individual additive.
Treat Rate
Typical treat rates from the technical data sheets, by application:
| Application | T1428B | T1620B |
|---|---|---|
| Engine oils | 2.0–4.0 wt% | 1.0–4.0 wt% |
| Industrial lubricants | 0.1–2.0 wt% | 0.1–2.0 wt% |
In a finished engine oil the dispersant is normally the highest-treat additive — total dispersant content typically runs 3–7 wt%, around half the additive package — and a borated grade is usually one part of that slate, chosen where high-nitrogen dispersancy must coexist with seal protection and added oxidation/wear resistance. Boration is what reconciles those: it improves seal compatibility and hydrolytic stability while adding antioxidancy, at a small cost in raw sludge dispersancy that the high-MW T1620B offsets with its larger backbone.
Treat rates are typical ranges from the TDS. The exact level depends on the soot/sludge load, the target boron level and the co-additive balance. The high-MW T1620B should be handled at no more than 75 °C and stored below 45 °C per its TDS. CheMost can provide formulation and treat-rate support on request.
Formulating With Borated Succinimide — Complementary Additives
A borated dispersant covers contaminant suspension plus some oxidation/wear support; a balanced package pairs it with:
Detergents & TBN boosters
Overbased detergents neutralise combustion acids and clean hot surfaces; the detergent–dispersant balance remains the backbone of the package even with a borated dispersant.
ZDDP antiwear additives
Boron’s boundary-film character supports, but does not replace, ZDDP; levels are balanced together and against the ash/phosphorus target.
Antioxidants
Phenolic and aminic antioxidants remain the primary oxidation defence; boron antioxidancy is complementary, helping extend oil life under low-SAPS constraints.
Non-borated dispersants
The borated grades are often blended with a straight dispersant such as T1428 to set the total boron and nitrogen of the package independently.
The CheMost Ashless Dispersant Family — Mono / Bis / Borated / HMW
Polyisobutylene succinimide dispersants come in four recognised types. The borated grades (this page) add boron multifunctionality; the others differ in nitrogen and molecular weight:
| Type | CheMost grade(s) | Distinctive feature | Best for |
|---|---|---|---|
| Monosuccinimide | T1351 | Single succinimide group, high nitrogen (2.1%) | 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 |
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
The borated succinimide grades are 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 boron-modified polyisobutylene succinimide?
It is an ashless bis-succinimide dispersant with boron bonded into the polar head. Besides dispersing soot and sludge, the boron adds antioxidancy, antiwear character and improved fluoroelastomer-seal compatibility — without contributing metal or sulphated ash. CheMost offers it as T1428B (standard MW, 1.0% B) and T1620B (high MW, 0.95% B).
What does boration add compared with a plain dispersant?
Boron makes the dispersant multifunctional: recognised benefits include oxidation resistance, boundary/antiwear support and better fluoroelastomer-seal compatibility (boration ties up the seal-aggressive free amine and low-MW species). This is why borated dispersants are favoured in low-SAPS and GDI/turbo formulations. The small reduction in raw sludge dispersancy is offset on the high-MW T1620B grade.
What is the difference between T1428B and T1620B?
Both are borated PIB succinimides. T1428B is the standard-molecular-weight grade (1.0% boron, TBN 28) for balanced low-SAPS PCMO and GDI/turbo oils; T1620B is the high-molecular-weight grade (0.95% boron, TBN 21) that adds stronger soot dispersancy for high-soot diesel and low-emission oils. T1620B should be handled at ≤75 °C and stored below 45 °C.
Are the borated grades suitable for low-SAPS oils?
Yes — they are ashless, so they add dispersancy and boron functionality without raising sulphated ash, which is helpful under emissions-driven low-SAPS limits. As always, the finished-oil ash/phosphorus/sulphur budget is set across the whole package.
How are the borated grades supplied, and how fast can I get a sample?
Both are 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.