Synthetic waxes: polyethylene, Fischer Tropsch and synthetic beeswax

Polyethylene wax melts at 90 to 120 C, Fischer Tropsch at 90 to 105 C. Molecular weights, use at 1 to 6 percent, and the EU microplastic restriction.

Three quite different materials are sold as synthetic wax and they are not variations on a theme. Polyethylene wax is a real polymer, Fischer Tropsch wax is a synthesised alkane wax with an unusually narrow carbon distribution, and synthetic beeswax is a blend built to imitate a natural wax's analysis. This page gives the molecular weights, the melt bands, the use levels, the reason colour cosmetic formulators will not give them up, and the EU restriction that now sits over two of the three.

• INCI: Polyethylene, Synthetic Wax, Synthetic Beeswax
• Melt 90-120 C
• Use at 1-6%
• Penetration 0.5-5 dmm
• EU dates: 2029 and 2035

The four names, and what each one actually covers

Synthetic wax is a shelf category, not a material. Four INCI names sit under it and they behave differently enough that swapping one for another will change a stick.

Polyethylene is ethylene polymerised into short chains, either at high pressure with a peroxide initiator, catalytically at low pressure, or by cracking polyethylene resin back down to wax length. It is the only one of the four that is unambiguously a polymer under the REACH definition, which matters for the restriction covered further down.

Synthetic Wax is the INCI name most often carrying Fischer Tropsch material. Carbon monoxide and hydrogen from gasified coal or natural gas are passed over an iron or cobalt catalyst and build straight alkane chains one carbon at a time. The output is chemically a paraffin, but a paraffin nobody distilled, so it carries none of the residual oil, aromatics or branched contaminants that a refinery cut does. Older labels and older catalogues call it synthetic paraffin.

Synthetic Beeswax and Synthetic Candelilla Wax are not single substances at all. Both INCI names describe a blend of long chain esters, fatty acids, fatty alcohols and hydrocarbons, mixed to approximate the analytical profile of the natural wax it replaces. What is in the tin depends entirely on who blended it. A label carrying one of these names can be entirely accurate and still tell you almost nothing about what is in the tin.

Polyethylene wax: molecular weight is the only dial

Cosmetic polyethylene waxes run a number average molecular weight of about 500 to 2,000, roughly 35 to 140 carbon atoms per chain. Below about 400 the material is a soft, greasy solid closer to petrolatum than to wax; above about 4,000 it stops dissolving in warm oil at any sensible temperature and acts as a filler. The cosmetic window sits between, and within it every property tracks one variable.

Raise the molecular weight and the melting point, hardness, melt viscosity and oil binding all rise together. A 700 molecular weight grade melts near 100 C and dissolves willingly into a hot oil phase. A 2,000 grade melts near 120 C with a needle penetration below 1 tenth of a millimetre, holds a stick rigid at 40 C, and resists going into solution unless you are patient. Density runs 0.91 to 0.98 g per cubic centimetre, tracking crystallinity.

What the hardness buys is heat resistance out of proportion to the amount used. A point of a 62 C wax barely moves the softening point of a finished balm, because it melts at nearly the same temperature as the network already there. A point of a 110 C wax inserts a crystal population still solid when everything else has gone, which is why 2 to 3 percent polyethylene holds a stick's shape at a temperature where the same stick made only with beeswax has slumped. That is the reasoning behind small percentages of carnauba wax in a summer formula, and the mechanism is in oleogels and wax networks.

Oxidised polyethylene is the same wax run through a controlled air oxidation that grafts carboxyl groups onto the chain ends, giving an acid value of roughly 15 to 30. The practical difference is polarity: neat polyethylene is a pure hydrocarbon and sits awkwardly in an oil phase built on castor oil or esters, while the oxidised grade dissolves more readily and wets pigment better.

Fischer Tropsch wax and the fine crystal argument

The interesting property of Fischer Tropsch wax is not its melting point, it is the shape of its carbon number distribution. Refinery paraffin is a distillation cut, so it contains a spread of chain lengths plus branched and cyclic contaminants that survived the process. A Fischer Tropsch wax is built rather than separated, and after hydrogenation and fractionation the chains are almost all straight and almost all within a narrow band, commonly quoted around C40 to C100 for the hard grades, with an oil content below 1 percent.

Uniform, unbranched molecules of similar length crystallise almost simultaneously, giving a very large number of very small crystals rather than the coarse plates a broad paraffin throws, with no soft low melting tail left over to migrate later. Two consequences follow, and both are why the material earns its price.

The first is texture. Small crystals mean a large internal surface area holding the liquid oil, so the wax structures a formula efficiently and leaves a smooth rather than granular film. It is hard without feeling draggy, which is unusual, and it is the closest thing on the market to what makes microcrystalline wax and ozokerite valuable in mineral waxes. The second is stability: a wax with no soft fraction has nothing to send to the surface as the network reorganises over weeks, so it neither blooms nor sweats. Where a stick develops a dull white film in storage, the culprit is almost always the broad-melting component, and balm sweating works through the diagnosis.

Synthetic beeswax, and what the name does not promise

Synthetic beeswax exists for two reasons: a vegan or animal-free specification, and batch consistency. Natural beeswax varies in colour, aroma and acid value with forage and rendering, which is charming in a small line and a nuisance in a repeatable one. A blended synthetic runs to a specification every time.

What it does not promise is composition. The INCI name covers any mixture of esters, acids, alcohols and hydrocarbons formulated to resemble beeswax, so two suppliers' material can differ in feedstock, in ester chain length and in melting behaviour while carrying the same name on a label. Some grades are built from vegetable derived fatty chains, some from petroleum derived ones, and the label will not distinguish them. If you are selling on a vegan or a plant derived claim you need the supplier's declaration of origin in writing, not the INCI name.

In use, a good synthetic beeswax behaves close enough to the natural material that you can substitute weight for weight and adjust by a point or two after a test pour. It has no honey note, which is either why you bought it or why you will not buy it again. For a maker whose real problem is avoiding an animal ingredient it competes with plant waxes rather than beating them, and vegan beeswax substitutes sets out that comparison.

Melting them, and the temperature a home setup cannot reach

This is where most small scale interest in polyethylene wax ends. A water bath cannot exceed 100 C at sea level, and in practice a double boiler stabilises somewhere around 90 to 95 C once you account for the vessel and the air gap. A polyethylene wax with a drop point of 110 or 120 C will not melt in one. It will soften, clump, and sit in the bottom of the jug.

Two things partly rescue the situation. The wax dissolves into hot oil below its neat melting point, the way sugar dissolves in water below its, so a 105 C grade can often be taken into solution at 95 to 98 C with stirring and patience. And a hotplate or induction ring with a thermometer in the melt reaches 120 C easily. But direct heat is a different discipline from a bain-marie: the vessel wall runs far hotter than the bulk, unsaturated oils oxidise measurably above about 100 C, and no thermal ceiling protects you from a scorched batch. Melt the wax phase alone at the temperature it needs, then let it down with the warm oils, and read melting methods first.

Pouring is the other half. A melt held at 110 C loses 40 or 50 degrees before it sets, so it cools through a wide window. Pour hot into cold containers and you get sinkholes; pour too cool and the high melting fraction has already nucleated in the jug. Targets and failure modes at each end are in pour temperatures, and cooling speed sets the crystal size you end up with.

Use levels, and taking the points out rather than adding them on

Polyethylene and Fischer Tropsch waxes are used at 1 to 6 percent of a finished formula. One percent is a measurable stiffening, three percent a typical lipstick loading, six percent the practical ceiling before the film feels plasticky and payoff drops. Most formulators who find themselves above it are compensating for a liquid phase that is too thin rather than solving a wax problem.

These are additions to a wax system, not replacements for one. A stick built only on polyethylene has hardness and nothing else: no cushion, no cling, poor payoff. The working pattern is a base wax carrying the bulk of the structure plus 2 to 4 points of a high melting synthetic to raise the softening point and stabilise the network. Take those points out of the existing wax load rather than adding them on top, or the total lands 3 or 4 points high and the stick drags. The wax substitution calculator handles the arithmetic when you swap at equal structure rather than equal weight.

Why colour cosmetic formulators will not give them up

Almost every mass market lipstick and stick foundation contains a synthetic wax, and it is not a cost decision. Four properties do the work.

Gloss retention. A fine, uniform crystal network gives a smoother reflecting surface than a coarse one, and it stays smooth. Broad-melting natural waxes recrystallise slowly at room temperature, roughening the film and taking the shine with it over weeks. The mechanism is in lip colour and gloss physics.

Mould release. Moulded lipstick bullets are released by shrinkage: the mass has to contract enough on solidification to pull away from the mould wall cleanly. Highly crystalline synthetic waxes shrink more predictably than a broad-melting natural wax and release without sticking or tearing, which on a production line is the difference between a saleable bullet and scrap. A small maker filling lipstick moulds by hand meets the same problem in a milder form.

No bloom. Bloom is the migration of a soft or incompatible fraction to the surface, appearing as a white haze. A wax with a narrow carbon distribution has no such fraction to donate, so the surface it sets with is the surface it keeps.

Pigment suspension. The same fine network holds heavy iron oxides and titanium dioxide in place during the minutes between pour and set, which is exactly the period in which pigment sinking to the bottom happens. Oxidised polyethylene grades do this best because the carboxyl groups wet pigment surfaces.

None of these is a benefit a plain balm needs. All of them matter in a coloured, moulded product held to a two year shelf appearance.

The EU microplastic restriction, and the dates that matter

Commission Regulation (EU) 2023/2055 inserted entry 78 into Annex XVII of REACH on 25 September 2023, restricting synthetic polymer microparticles. It applies where such particles are present on their own or in a mixture at 0.01 percent by weight or more.

The definition catches a polymer that is solid, that exists as particles of which at least 1 percent by weight have all dimensions of 5 mm or less, and that is neither degradable under the regulation's test criteria nor soluble above 2 g per litre. Unmodified natural polymers are outside it, as are polymers with no carbon in the backbone. Polyethylene meets every element and is the textbook case the restriction was written around.

The long windows are derogations, not exemptions. A lip balm containing polyethylene can be sold in the EU today, must carry a microplastics statement from October 2031, and cannot be sold at all from October 2035.

Fischer Tropsch wax sits in a less settled position. It is manufactured by chain growth, but whether a given grade satisfies the REACH definition of a polymer, which requires a majority of molecules to contain three or more monomer units and no single molecular species to dominate, is a question about that specific product's molecular weight distribution. Some grades will be polymers on that test and some will not. That is not something anyone can settle for your material from the outside. It is a question for the supplier's regulatory declaration and, if you are selling in the EU, for the safety assessor who signs off your product information file.

Great Britain has no equivalent restriction. The 2017 microbead regulations there cover rinse-off cosmetics only, so a polyethylene lip balm is currently lawful in GB and on a countdown in the EU. If you sell in both, that divergence is exactly the kind of thing selling balms in the UK and EU exists to keep track of.

Cost, minimum orders, and whether you can actually buy any

Per kilogram these are cheap waxes, roughly the same band as refined paraffin and well below candelilla or carnauba, and cheaper still per formula because 2 to 3 percent is enough.

Availability is the obstacle. Producers sell in 20 to 25 kg bags with pallet minimums, and the distributors who break bulk usually want a trade account and an order in the tens of kilograms. Very few of the suppliers who sell 100 g of beeswax to hobby makers stock synthetic wax at all, because there is no retail demand to justify the shelf space. Samples of 500 g to 1 kg are often free from a manufacturer if you can present as a business with a plausible volume, which is the practical route in. Specification sheets, certificates of analysis and minimum orders are covered in sourcing ingredients.

When a small maker should not bother

For most people reading this, the honest answer is that these waxes are not worth pursuing. The decision rule has four tests, and a synthetic wax has to pass all of them.

You need a problem the naturals cannot solve. A stick that softens above 35 C, a bloom that returns after every reformulation, or pigment that will not stay suspended are real cases. General hardness is not: carnauba at 1 to 3 percent, candelilla at 5 to 9, or a hard ozokerite grade covers almost everything a plain balm needs, and waxes compared sets out where each one wins.

You need the equipment. If your entire process is a saucepan of water and a jug, a 110 C wax is not available to you, and working around that by dissolving it incompletely produces the grit fault rather than the benefit.

You need the volume. A 25 kg minimum at 3 percent is 830 kg of finished balm, somewhere north of 150,000 lip tubes. Bought for a market stall line, the bag sits in a corner of the workshop for a decade.

And your positioning has to survive it. Polyethylene on an ingredient list reads as plastic to a large share of the buyers who choose small brand balms, fairly or not, and from October 2031 an EU lip product containing it must say so on the label in exactly those terms. That is a commercial fact, separate from the safety question, and it is the one that ends the discussion for most independent makers.

Where all four tests pass, which in practice means moulded or pressed colour cosmetics in commercial quantities, these are the correct materials and nothing plant derived matches them. Everywhere else the waxes already on your shelf are the better answer, and the money is better spent on a hotplate with a controller than on a bag of polymer.

Reviewed and updated 6 September 2026. Spotted an error? Tell us and we will fix and log it.