What is the HLB value of Span 60?
4.7
Commonly Used Emulsifiers And Their HLB Values
| Commercial Name | Chemical Name | HLB Value |
|---|---|---|
| Span� 60 | Sorbitan monostearate | 4.7 |
| Span� 65 | Sorbitan tristearate | 2.1 |
| Span� 80 | Sorbitan monooleate | 4.3 |
| Span� 85 | Sorbitan trioleate | 1.8 |
What is difference between tween and span?
Span 80 has an HLB value of 4.3, which falls within the usual range of HLB 4–6 for water-in-oil (W/O) emulsifiers. Tween 80 has an HLB value of 15, within the range of HLB 8–18 for oil-in-water (O/W) emulsifiers. This is because engine emissions are correlated with the oxygen content of the alcohols.
What is span in compounding?
A compounding period is the span of time between when interest was last compounded and when it will be compounded again. For example, annual compounding means that a full year will pass before interest is compounded again. When interest compounding occurs, interest is added to the principal on a loan.
Is span an emulsifier?
Sorbitan esters (also known as Spans) are nonionic surfactants that are used as emulsifying agents in the preparation of emulsions, creams, and ointments for pharmaceutical and cosmetic use.
What is the HLB of a mixture of 40% span 60 and 60% Tween 60?
What is the HLB value of a mixture consisting of 40% span60 (HLB 4.7) and 60% Tween 60 (HLB 14.9).
How do you calculate HLB value?
Using the following equation: HLB desired = ( % surfactant A ) × ( HLB Surfactant A ) + ( % surfactant B ) × ( HLB Surfactant B . ) A blend of surfactant A, HLB = 7.8, and surfactant B, HLB = 13.4 produces a combination that is water soluble and contributes other desired properties.
In what proportion should Tween 80 and Span 80?
In this work, O/W emulsion sets were prepared by using different concentrations of two nonionic surfactants. The two surfactants, tween 80(HLB=15.0) and span 80(HLB=4.3) were used in a fixed proportions equal to 0.55:0.45 respectively. HLB value of the surfactants blends were fixed at 10.185.
Is polysorbate 80 and Tween 80 the same?
Tween 80 is also a polyethylene sorbitol ester, otherwise known as Polysorbate 80 or polyoxyethylene sorbitan monooleate. It has a molecular weight of 1.31 kDa and works well as a stabilizer and emulsifier, primarily in cosmetics, pharmaceuticals, and food products.
What is the difference between span 20 and span 80?
Since Span 80 is more hydrophobic (HLB = 4.3) than Span 20 (HLB = 8.6), it produced two phases of proniosomal liquids at cholesterol concentrations below 30%. The formed proniosomal gels were found to be thermo-reversible.
What does a high HLB mean?
high water-solubility
The lipophilic groups are typically saturated or unsaturated alkyl chains. The HLB number is usually on a scale of 0–20. Lower HLB values are an indication of high oil affinity. A high HLB value, on the other hand, indicates high water-solubility.
Is span soluble in water?
Span 60 Properties Practically insoluble, but dispersible in water, slightly soluble in alcohol. Soluble in ethanol (50 mg/ml), isopropanol, mineral oil and vegetable oil. Insoluble in water.
How is span defined?
1 : the distance from the end of the thumb to the end of the little finger of a spread hand also : an English unit of length equal to nine inches (22.9 centimeters) 2 : an extent, stretch, reach, or spread between two limits: such as. a : a limited space (as of time) especially : an individual’s lifetime.
What does it mean to have a HLB of 10?
Required HLB for Ingredient Blends This means that an emulsifier, or blend of emulsifiers, having an HLB of 10 will make a more Table 2 gives you some idea of the required HLB stable fluid O/W paraffin emulsion than emulsifiers values for O/W emulsions of various oils and of any other HLB value.
How to calculate the HLB of a blend?
When two or more emulsifiers are blended, the resulting HLB of the blend is easily calculated. For example, suppose you want to determine the HLB value of a blend comprising 70% of TWEEN 80 (HLB = 15) and 30% Of SPAN 80 (HLB = 4-3).
Which is more hydrophilic spans or tweens?
Spans are sorbitan fatty acid esters having low HLB values ranging from 1.8 to 8.6. Tweens are polyoxyethylene derivatives of spans. So, they are more hydrophilic having V higher HLB values ranging from 9.6 to 16.7. \\ \\