What are SBP cuts?
Special Boiling Point (SBP) solvents are narrow-cut aliphatic hydrocarbon fractions produced to precise distillation specifications. The defining characteristic is a tight boiling range, typically 20 to 40°C between IBP and FBP, which gives formulators predictable and repeatable evaporation behaviour that broader-cut solvents cannot reliably deliver.
SBP cuts are dearomatised or low-aromatic by nature, with aromatic content typically well below 1 wt% and benzene below 1 ppm. This makes them suitable for applications where aromatic content, odour, or worker exposure is a concern, without requiring the premium associated with fully dearomatised D-cut or isoparaffinic grades.
The grade naming convention, SBP 60/95, SBP 80/110, SBP 100/140 and so on, directly reflects the nominal boiling range in degrees Celsius. This makes grade selection relatively transparent once you understand what the boiling range means for your process. The practical challenge is that producers may apply slightly different specifications to grades with the same name, so the boiling range reference should always be confirmed against the current product datasheet.
Why tight boiling range matters: a wider-cut solvent contains components that evaporate at different rates across the drying window. In adhesive bonding, coating application, or rubber compounding, this produces inconsistent open time, variable tack development, and less predictable surface finish. SBP cuts eliminate most of that variability by constraining the distillation range.
How SBP cuts differ from D-cuts and white spirit
SBP cuts, D-cuts, and conventional white spirit grades all cover overlapping boiling ranges, which creates confusion in purchasing. The distinctions are practical and matter for specification:
- SBP cuts vs white spirit: conventional white spirit grades are broader-cut fractions, typically with 14–27 wt% aromatics. SBP cuts are narrow-cut, low-aromatic fractions. The evaporation behaviour is more controlled, the aromatic content is lower, and the solvency profile differs.
- SBP cuts vs D-cuts: both are low-aromatic. The primary difference is the distillation width. SBP cuts are specifically defined by their tight IBP/FBP window. D-cut grades (D30, D40, D60 etc.) tend to have wider distillation ranges and are defined primarily by initial boiling point rather than the IBP/FBP spread. For applications where evaporation rate precision is the primary requirement, SBP cuts are often the better specification.
- SBP cuts vs isoparaffinic fluids: isoparaffinic grades offer the lowest possible aromatic content and minimal odour, but at a higher cost. SBP cuts provide good aromatic control at a more competitive price point for high-volume applications.
Related guide: if your application is primarily driven by aromatic content reduction rather than tight evaporation control, our guide on dearomatised D-cut grade selection may be the more relevant starting point.
SBP cut grades: typical market specifications
The table below shows representative typical values for SBP cut grades as commonly traded in the European market. Exact specifications depend on producer, grade variant, and current product datasheet. Always confirm against the producer's current Product Data Sheet (PDS) and the Certificate of Analysis (CoA) for the specific batch.
| Grade | IBP °C | FBP °C | Flash point °C | Density kg/m³ | Aromatics wt% | Viscosity mm²/s |
|---|---|---|---|---|---|---|
| SBP 40/65 | ~44 | ~63 | ~−27 | ~702 | ≤0.001 | ~0.55 |
| SBP 60/95 S | ~64 | ~98 | ~−27 | ~702 | ≤0.001 | ~0.55 |
| SBP 80/95 | ~86 | ~93 | ~−10 | ~726 | ≤0.001 | ~0.66 |
| SBP 80/110 | ~89 | ~107 | ~−10 | ~726 | ≤0.001 | ~0.66 |
| SBP 100/140 | ~106 | ~138 | ~0 | ~744 | ~0.001 | ~0.78 |
| SBP 100/160 | ~109 | ~157 | ~4 | ~747 | ~0.001 | ~0.82 |
| SBP 140/165 | ~143 | ~161 | ~33 | ~764 | ~0.002 | ~1.01 |
| SBP 145/160 | ~146 | ~157 | ~33 | ~764 | ~0.002 | ~1.01 |
Typical market ranges. Exact values depend on producer and current PDS/CoA. Density reported at 15°C, viscosity at 25°C.
Grade selection: the practical logic
SBP grade selection follows the same core logic as other hydrocarbon solvents: flash point first, then evaporation profile. Flash point is typically the constraining parameter because it determines storage classification, transport conditions, and process safety requirements. Once the minimum acceptable flash point is established, the IBP/FBP window defines the evaporation behaviour within that constraint.
Lower-boiling grades: SBP 40/65, SBP 60/95, SBP 80/95, SBP 80/110
These grades have flash points below 0°C and are classified as flammable liquids under CLP. They evaporate rapidly, making them suitable for fast-dry applications where open time is short by design: contact adhesives where rapid tack development is required, fast-drying rubber cements, aerosol carrier applications, and industrial cleaning where complete evaporation before the next process step is critical.
The difference between SBP 80/95 and SBP 80/110 is the FBP, 93°C vs 107°C. In most applications this is marginal, but in processes sensitive to residual solvent or tail evaporation, the tighter 80/95 cut gives cleaner final evaporation.
Mid-range grades: SBP 100/140, SBP 100/160
Flash points around 0–4°C. These grades bridge the gap between fast-evaporating lower cuts and the slower-drying SBP 140+ range. Common in printing inks where ink viscosity and drying window are both formulation variables, industrial coatings requiring moderate open time, and metal surface cleaning where some dwell time is needed before evaporation.
SBP 100/160 has a wider boiling range than SBP 100/140, the additional FBP width gives slightly extended drying behaviour and marginally higher viscosity. In ink formulation this can be a deliberate choice to improve flow characteristics.
Higher-boiling grades: SBP 140/165, SBP 145/160
Flash points around 33°C, these grades are in the same flash point bracket as standard white spirit, but with a narrower distillation range and lower aromatic content. They function as controlled-evaporation, lower-aromatic alternatives to white spirit in coating and wood treatment applications, and are also used in wax formulations where a slow, even evaporation front is needed for surface quality.
Flash point classification note: SBP grades with flash points below 21°C are typically classified as Category 1 or 2 flammable liquids under CLP. Storage, handling, and transport conditions differ substantially from grades above 23°C. If you are switching to a lower-boiling SBP grade or sourcing SBP for the first time, confirm the relevant classification with the current SDS and verify it against your site licence conditions before the first delivery arrives.
Primary applications by grade group
| Application | Typical grade range | Key selection driver |
|---|---|---|
| Contact adhesives & rubber cements | SBP 60/95 · SBP 80/95 | Fast evaporation, tack development speed |
| Industrial rubber processing | SBP 80/110 · SBP 100/140 | Evaporation rate, compound compatibility |
| Printing inks, fast drying | SBP 80/110 · SBP 100/140 | Controlled evaporation, low aromatic |
| Industrial coatings & metal cleaning | SBP 100/140 · SBP 100/160 | Moderate flash point, open time |
| Wood coatings & stains | SBP 100/160 · SBP 140/165 | Penetration, drying window |
| Wax formulations & polishes | SBP 140/165 · SBP 145/160 | Slow even evaporation, low odour |
| Aerosol carrier / propellant blend | SBP 40/65 · SBP 60/95 | Low boiling, low density, fast release |
Representative market pairings, not universal rules. Your specific formulation, substrate, and process conditions will determine the optimal grade.
A sourcing discussion that covers evaporation rate, flash point constraints, and aromatic content together, rather than treating the grade name as a complete specification, is far more likely to deliver a product that performs as the process requires.
What to specify on your purchase order
SBP cuts are frequently ordered by grade name only, SBP 80/110, SBP 100/140, without further specification. This is usually sufficient when there is an established supply relationship and a known reference product. When sourcing a new supplier, or when the application has tight process tolerances, the following parameters should be explicitly stated:
- IBP and FBP: specify the acceptable range for both. Different producers may interpret a grade name differently at the margins.
- Flash point minimum: state the minimum flash point required for your storage, transport, and process classification. Do not assume the grade name alone defines this.
- Maximum aromatic content: for most SBP grades this is below 0.01 wt%, but confirm if your application has a specific aromatic limit.
- Density at 15°C: relevant for volumetric dosing accuracy in formulation.
- CoA with each delivery: confirming actual IBP, FBP, flash point, density, and aromatic content for the batch supplied.
On naming variation: SBP grade naming is not standardised across producers in the way that, for example, CAS numbers are. A grade sold as SBP 80/110 by one producer may have a slightly different specification than the same name from another. This is especially relevant for narrow-cut grades like SBP 80/95 where a 7°C FBP range leaves very little tolerance. Always request and retain the current PDS from the supplying party at the point of offer.
Common substitution and specification errors
- Substituting SBP 80/95 with SBP 80/110: the FBP difference of ~14°C is small in absolute terms but can produce measurable differences in tail evaporation behaviour and residual solvent levels in adhesive applications.
- Ordering by grade name without confirming flash point: SBP 100/140 has a flash point around 0°C, which puts it in a different transport and storage category than grades above 23°C. This is not always obvious from the grade name alone.
- Assuming SBP and white spirit are equivalent in the same boiling range: they are not. White spirit in the 100–140°C boiling range contains 14–25 wt% aromatics and has a broader distillation curve. Substituting one for the other will produce different formulation outcomes.
- Treating all SBP 100/140 grades as identical: producer specifications vary at the margins. If your process relies on consistent evaporation behaviour, qualify the specific producer's grade before switching sources.
Summary
- SBP cuts are narrow-cut, low-aromatic aliphatic hydrocarbons defined primarily by their tight IBP/FBP range.
- Flash point is the primary selection constraint, it determines storage and transport classification before any formulation consideration applies.
- The tight boiling range is the functional advantage over broader-cut solvents, it gives controlled, repeatable evaporation behaviour.
- SBP cuts are not interchangeable with D-cuts, white spirit, or isoparaffinic grades of the same boiling range, the distillation width, aromatic content, and solvency profile differ.
- Always specify IBP, FBP, flash point minimum, maximum aromatic content and density, not just the grade name.
- Request a CoA with each delivery; producer specifications for the same grade name can vary at the margins.
Discuss a specific grade
Send an SBP specification or an application description
If you are evaluating an SBP grade for a specific application and want to discuss the specification, grade name, IBP/FBP, flash point minimum, volume and delivery context, send an enquiry. The enquiry will be reviewed and, where it fits the network, forwarded to a supplier operating in the relevant category.
Send an enquiry →