A roll of film that will not open cleanly on the packaging line, bags that cling and jam the feeder, sheets that stick to each other in the stack: the problem is friction, and the fix is a slip agent that lets the plastic surfaces glide past each other. Oleamide is the fast, low-cost workhorse for that job.
The short version: oleamide is a fatty-amide slip agent. Compounded into polyethylene or polypropylene at a fraction of a percent, it is just incompatible enough with the polymer that it migrates, or “blooms,” to the film surface and forms a thin lubricating layer. That layer drops the coefficient of friction from around 0.4 on unmodified film to roughly 0.1 to 0.2, so the film slides, opens, and feeds without sticking.
Why high friction is a problem
Unmodified polyolefin film has a high coefficient of friction (COF), often around 0.4 or higher. At that level the film blocks (layers stick together), bags will not open, rolls telescope, and high-speed packaging lines jam or run slow. Lowering the COF is what makes film machinable, and a slip agent is how you do it without changing the polymer.
How oleamide blooms to the surface
The mechanism is controlled incompatibility. Oleamide dissolves into the molten polymer during extrusion, but once the film cools it is only partly compatible, so it slowly migrates out of the bulk and to the surface. There it crystallizes into a microscopically thin, waxy lubricating layer. That surface layer, not the oleamide in the bulk, is what lowers friction.
Oleamide is a fast-bloom slip agent: its shorter C18 chain migrates quickly, so the film develops slip within hours rather than days. That speed is its main advantage and the reason it suits blown film, bags, and high-speed packaging where slip is needed soon after production.
The coefficient of friction is the number that matters
| State | Typical COF |
|---|---|
| Unmodified PE/PP film | ~0.4 or higher (blocks, jams) |
| With a bloomed slip agent | ~0.1 to 0.2 (slides, opens, feeds) |
COF develops over a conditioning period as the oleamide blooms, so a fresh film tests higher than the same film after it has sat. Process and QA teams measure COF on conditioned film, not straight off the line.
Loading and what shifts it
Oleamide is dosed at roughly 0.2 to 0.5 wt% (about 200 to 2,000 ppm) in the finished film, usually added through a 5 to 10% masterbatch rather than neat for even dispersion.
Two things move the right number: the polymer (PP runs hotter and more crystalline than PE, so bloom differs), and the antiblock. Antiblock fillers such as silica physically separate layers, but they also adsorb migrating slip agent, so a film with antiblock needs more slip to hit the same COF. The slip-and-antiblock balance is covered in slip and antiblock in PE/PP film.
Where oleamide fits, and where erucamide is the better tool
Oleamide wins on speed-to-slip and cost: fast bloom, low price, ideal for LDPE/LLDPE blown film, bags, and lower-temperature processing. It is the cheaper, faster tool, not always the better one. Where you need a lower, more stable COF, less odor, or higher thermal stability, erucamide is the right choice, and the full comparison is in oleamide vs erucamide. A supplier worth using will spec the one your line actually needs.
Buying oleamide in bulk
RawSource supplies oleamide (CAS 301-02-0) as prills, beads, or powder at 99.5% minimum total amide, for plastics and polymer film, masterbatch, and processing, with CoA documentation, by the bag and pallet. Request a sample and confirm the bloom rate and COF on your own film and line before committing to a bulk order.
Frequently asked questions
How does oleamide work as a slip agent?
It is partly incompatible with the polymer, so after extrusion it migrates (blooms) to the film surface and forms a thin lubricating layer that lowers the coefficient of friction from about 0.4 to roughly 0.1 to 0.2, letting the film slide and open.
What coefficient of friction does oleamide give?
Typically around 0.1 to 0.2 on conditioned film, down from about 0.4 unmodified, depending on loading, polymer, antiblock, and bloom time.
How much oleamide do I use in film?
Roughly 0.2 to 0.5 wt% (200 to 2,000 ppm) in the finished film, usually via a 5 to 10% masterbatch. Validate the level on your own film, since antiblock and polymer type shift it.
How long does oleamide take to bloom?
Oleamide is a fast-bloom slip agent and develops slip within hours, faster than the slower-blooming erucamide. Final COF is measured after a conditioning period.
Oleamide or erucamide?
Oleamide blooms faster and costs less; erucamide gives a lower, more stable COF with less odor and better thermal stability. Choose by application, see the full comparison.
Editorial note. This article is general technical guidance for plastics and packaging professionals, written for industrial and professional use. Oleamide here is an industrial slip and processing additive for plastics, not a food, supplement, or consumer product, and nothing here is a health or efficacy claim. Loading and COF figures are typical literature and vendor ranges to validate by trial; the Certificate of Analysis governs the material you buy. Consult the product Safety Data Sheet (SDS) before use. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.
