Sorbitan esters are lipophilic nonionic emulsifiers made by esterifying sorbitol/sorbitan with fatty acids: sorbitan laurate, palmitate, stearate, oleate and tristearate types (often known as SPAN-type grades). They sit at the oil side of an emulsion and are almost always paired with a hydrophilic polysorbate of the same fatty acid.
What sorbitan esters are
Sorbitan esters are lipophilic nonionic emulsifiers made by esterifying sorbitol/sorbitan with fatty acids: sorbitan laurate, palmitate, stearate, oleate and tristearate types (often known as SPAN-type grades). They sit at the oil side of an emulsion and are almost always paired with a hydrophilic polysorbate of the same fatty acid. Dyna Glycols manufactures them to agreed SAP, hydroxyl value, acid value, melting behaviour and colour.
Sorbitan monooleate is a liquid W/O emulsifier and lubricant additive. Sorbitan monostearate is a waxy cream and food-adjacent emulsifier. Sorbitan tristearate is more lipophilic still. These esters contain no ethylene oxide until they are converted to polysorbates on the ethoxylation plant.
How Dyna Glycols manufactures sorbitan esters
Sorbitol is cyclised and esterified with the named fatty acid to a target mono/di/tri ratio. Finishing sets acid value, colour and melt. QA uses SAP and hydroxyl value as identity. The same site ethoxylates these esters to polysorbates so a matched pair can be supplied.
Oleate, stearate, palmitate and laurate are the standard acids. Custom mixed cuts and specific hydroxyl windows are available when a lubricant or food-adjacent specification is tight.
Typical grades in this range
Name the fatty acid and whether the grade is mono-, sesqui- or tri-ester.
- Sorbitan monolaurate, monopalmitate, monostearate, monooleate
- Sorbitan sesquioleate and trioleate / tristearate types
- Matched pairs with polysorbate 20, 40, 60, 80
- Custom SAP, hydroxyl and melting range
Where sorbitan esters are used
Personal care and pharmaceutical-adjacent creams use sorbitan stearate or oleate with the matching polysorbate to walk HLB across an oil phase. W/O sunscreens and balms use the more lipophilic sorbitan esters alone or with polyglycerol esters.
Food-adjacent emulsions, chocolate and bakery systems use selected sorbitan esters as crystal modifiers and emulsifiers where permitted. Industrial uses include lubricant additives, textile fibre finishes, agro EC systems and explosives or mining emulsions that specify SPAN-type chemistry.
Paints, inks and pigment wetting can use sorbitan oleate as a lipophilic dispersant. Leather and metal-working oil phases use them as co-emulsifiers.
How to specify sorbitan esters
State the fatty acid, mono vs tri, SAP and hydroxyl targets, melting range and colour. If a polysorbate partner is needed, order both so fatty-acid lots match.
For lubricant or food-adjacent duty, attach the extra tests (for example hydroxyl window, iodine value for oleates) from the existing specification.
Quality, documents and supply
Lots are released against SAP, hydroxyl, acid value, appearance, colour and melt where relevant. SDS and COA follow verification. Samples support W/O or O/W pair trials.
Store dry. Melt waxy stearates uniformly. Oleates should be protected from air that raises peroxide and colour.
Practical notes on sorbitan esters
HLB of sorbitan esters is low (typically about 1.8–8 depending on the grade). They are not O/W emulsifiers on their own except at high water-in-oil internal phase with process shear. Pair them with polysorbates for O/W creams.
Hydroxyl value tracks residual hydroxyls and therefore the mono vs tri character. It is as important as SAP on the COA.
Iodine value on oleate grades predicts drying and odour. Low-iodine or antioxidant-stabilised oleates should be requested if storage is long.
Dyna Glycols manufactures polysorbates on the ethoxylate side of the catalogue. A combined shipment of sorbitan oleate and polysorbate 80 is the usual development pack.
These esters can hydrolyse in strong alkali. Check process pH. They are generally more oil-soluble than glyceryl monostearate and give a different crystal network in creams.
For a first sample, name the SPAN-type (20/40/60/80 analogue) or the INCI, plus whether the trial is W/O or O/W with a polysorbate partner.
Ordering and evaluating sorbitan esters
Send the application, the analytical window and the pack size when you request a laboratory sample of sorbitan esters. SDS, TDS and COA follow a short company check. Handle and store the grade as the SDS describes.
Next step
Need a specification for this chemistry?
Tell us the substrate, EO/PO moles and the application. We will confirm a catalogue grade or a custom batch.