Paraffin wax emulsion is a milky-white, water-based dispersion of refined paraffin wax. It is an anionic, oil-in-water emulsion with 30% solids, used as a water-repellent and surface-sizing aid in paper, kraft paper and duplex board manufacturing. It gives the finished sheet better water resistance, gloss and surface smoothness.
- Formulation
- Refined paraffin wax dispersed in water as a stable oil-in-water (O/W) emulsion.
- Solids content of 30% ± 1% (ASTM D2369 oven method).
- Anionic in nature, with a pH of 8.0 – 9.5.
- Fine particle size, from sub-micron to about 1–2 microns.
- Technical Features
- Appearance: White to off-white, pearly, free-flowing liquid.
- Viscosity: Low; water-thin to lightly pourable, which makes dosing and pumping easy.
- Specific gravity: About 0.98 – 1.00 g/cm³.
- Stability: No visible phase separation under normal storage.
- Odour: Mild and characteristic.
- Uses
- Surface sizing of kraft paper and duplex boards for improved water repellency.
- Internal or surface treatment to raise moisture resistance in paper products.
- Improving gloss, smoothness and printability of the paper surface.
- Size press, coating and spray application systems.
Advantages: strong water repellency at low dosage, better gloss and printability, easy mixing with water-based systems, and fine particle size for even coverage on the sheet.
Dosage: A typical starting point is 0.5% – 2.0% on dry fibre basis, adjusted through trials to the required Cobb value and machine conditions.
FAQs on Paraffin wax Emulsion
What is paraffin wax emulsion used for in paper manufacturing?
It is used as a sizing agent that makes paper, kraft paper and duplex board resist water. It also improves the gloss, smoothness and printability of the finished sheet.
How much paraffin wax emulsion should be added?
A typical starting dosage is 0.5% – 2.0% on dry fibre basis. The exact level depends on the target Cobb value, the substrate and machine conditions, so a lab or plant trial is recommended first.
What does "30% solids" mean?
It means 30% of the emulsion by weight is active paraffin wax, with the rest mostly water. The solids content is held at 30% ± 1% and checked by the ASTM D2369 oven method.
Can it be used in size press and spray systems?
Yes. Its low viscosity and fine particle size suit size press, coating and spray application. It mixes easily with water-based sizing formulations.
How should paraffin wax emulsion be stored?
Store it in sealed original packaging between 5°C and 35°C, away from sunlight and heat, and protect it from freezing. Shelf life is up to 6 months from manufacture; stir gently before use if any separation appears.