Microcrystalline Wax Definition
Microcrystalline wax is a refined mixture of solid, saturated hydrocarbons, mainly branched paraffin, obtained from petroleum. In contrast to paraffins, microcrystalline waxes may vary widely in character depending on the crude-oil source and the method and degree of refinement. Some are ductile, like beeswax; others are hard and brittle; and still others crumble easily during handling. Microcrystalline waxes may be made from the residue of crude petroleum by refining; or they may be made from petroleum jelly by removing the oil with a solvent. Their physical properties may be controlled by the temperature of the solvents. Methods of separation include solvent dilution, chilling, centrifuging, filtering, and various combinations of these Chemically, microcrystalline waxes consist of saturated aliphatic hydrocarbons. Microcrystalline Wax is also known as Petroleum wax.
Petroleum Wax Applications
1- Industries such as
– tire and rubber
– corrugated board
– castingsUsed in custom making of jewelry and small sculptures.
2- Museum and conservation settings for protection and polishing of antique woods, ivory, gemstones, and metal objects.
3- A key component in the manufacture of petrolatum.
4- Inks, Paints and Coatings
5- Paper and Packaging
6- Personal Care
7- Polymer Additives
Petroleum Wax Characteristics
- Insoluble in water
- very slightly soluble in ethanol
- sparingly soluble in diethyl ether and hexane
- Melting Range : 62-102°C
- Viscosity @ 100°C : Not less than 11 cSt.
- Sulfur : Not more than 0.4%
- Arsenic : Not more than 3 mg/kg
|MELTING POINT, F||ASTM D127||170/180|
|MELTING POINT, C||ASTM D127||76.7/82.2|
|PENETRTION@ 77 f||ASTM D1321||25/35|
|COLOR, SAYBOLT||ASTM D 156||+16 Min.|
|RESIDUE ON IGNITION||NF (current revision)||0.10 Max.|
|ALKALINITY||NF (current revision)||PASS|
|ACIDITY||NF (current revision)||PASS|
|FIXED OILS, FATS, AND ROSIN||NF (current revision)||PASS|
|COLOR||NF (current revision)||PASS|
|ORGANIC VOLATILE IMPURITIES||NF (current revision)||PASS|
|VISCOSITY@210@F, SUS||ASTM D445||75/90|
|FLASH POINT, COC, F||ASTM D92||530 Min.|
|ODOR RATING, PANEL AVERAGE||LATM 93||0.8 Max.|
Comparison Table of MICROCRYSTALLINE WAX & PARAFFIN WAX
|PARAFFIN WAX||MICROCRYSTALLINE WAX|
|Mainly unbranched alkanes||Mainly branched alkanes|
|Low melting (48 to 70ºC)||Higher melting (54 to 95ºC)|
|White||White to Colored|