Slip additives for coatings and inks should be selected against a measurable friction or surface-handling target—not simply because the film should “feel smoother.” Define whether you need lower static friction, lower dynamic friction, improved hand feel, reduced scratch damage, easier release, or a combination. Then protect the properties most likely to be affected: recoatability, printability, lamination, sealing, gloss, and intercoat adhesion.
This guide focuses on slip and cured-film handling. If two faces stick after heat, pressure, or storage, use the separate anti-blocking guide and run a conditioned block test.
Turn “slip” into a testable specification
Static friction affects the force required to start movement. Dynamic friction affects movement after sliding begins. Hand feel is a sensory observation and does not replace either value. ISO 8295 describes a quality-control method for starting and sliding friction of plastic film and sheeting, while noting that it does not provide a complete assessment of machinability.
| Business symptom | Translate it into | Guardrail |
|---|---|---|
| Web drags or will not feed consistently | Static and dynamic friction target | Registration, winding, and blocking |
| Surface feels tacky or grabby | Sensory panel plus friction values | Gloss and appearance |
| Film scratches during packing | Defined rub/scratch method after full cure | Recoat and print adhesion |
| Part will not release cleanly | Release force or pass/fail fixture | Contamination of the next operation |
Four Longchang slip-additive routes
| Produit | Use as the first comparison when | Supplier starting range | Key limitation or check |
|---|---|---|---|
| CHLUMIFE® 3482 / 3482X | The formulation is water-based and needs lower friction, anti-sticking, improved slip feel, and abrasion support | 0.05–1% | Water-based only; pre-dilute; check pinholes, freeze exposure, and dilution storage |
| CHLUMIFE® 3166 | Dry feel and smoothness must be balanced with scratch resistance, anti-blocking, leveling, and gloss | 0.05–1% | Check pinholes, whitening, and foam stabilization |
| CHLUMIFE® 1206 | A solvent-side or mineral-oil-compatible route needs lubrication, wear resistance, release, or anti-sticking | 0.1–1% | Not listed for water-based systems; add near the end; check low-temperature appearance and compatibility |
| CHLUMIFE® 3307X | The film forms acceptably but needs better abrasion/scratch resistance, surface smoothness, and recoatability balance | 0.1–1% | UV and solvent systems; follow the supplier dilution instruction and verify recoatability in your process |
The ranges above are supplier-published screening ranges. Do not assume that the midpoint is optimal. Excess surface additive can improve a friction reading while damaging adhesion, appearance, foam release, or downstream bonding.
How to choose between the four routes
Water-based ink or coating with high friction
Begin with CHLUMIFE® 3482/3482X when the primary target is friction reduction and anti-sticking in a water-based system. Compare 3482X when dilution stability matters. Include a blank and check pinholes at each level.
Dry touch matters as much as the friction number
Screen CHLUMIFE® 3166 when dry feel, smoothness, scratch resistance, leveling, and gloss all enter the decision. Because the supplier also flags foam stabilization and possible whitening or pinholes, evaluate those effects rather than relying on a hand-feel comparison alone.
Solvent-side lubrication or release is the main task
CHLUMIFE® 1206 is the more relevant first comparison where oil solubility, lubrication, release, and wear resistance define the job. It is not listed for water-based systems.
The cured film scratches, but later coating still matters
CHLUMIFE® 3307X is specifically positioned for abrasion and scratch resistance after film formation and for a recoatability-conscious balance. Test it only after the control film is fully cured; an under-cured control makes the comparison unreliable.
A compact slip-additive test matrix
- Define the substrate pair. Record whether the test is coating-to-coating, coating-to-film, or coating-to-metal and which face is moving.
- Hold application variables constant. Use one film weight, cure schedule, surface treatment, and conditioning time.
- Run a blank plus three dosage levels. Document dilution, addition stage, and mixing energy.
- Measure after more than one aging interval. Surface-active materials can redistribute after cure, so compare early handling with the normal shipment or converting interval.
- Test the next process. Recoat, print, laminate, seal, tape, or bond the surface exactly as the customer will.
For printed materials, ASTM D5264 provides a laboratory comparison of abrasion resistance using a Sutherland rub tester and explains why transport, storage, and handling can damage appearance and legibility. If adhesion to metal is a guardrail, ASTM D3359 is a useful reference, but operator technique, film thickness, and the agreed method must be controlled.
Common mistakes that produce misleading results
Choosing by hand feel alone
A panel may prefer a silky surface that is unsuitable for printing, lamination, or winding. Report the sensory result beside friction, blocking, gloss, and adhesion data.
Using one test speed or one contact material
Friction changes with the contacting surfaces and test conditions. Use the substrate pair and speed that represent the actual operation, and state them in the result.
Calling a scratch result “abrasion resistance” without a method
Fingernail, stylus, rub, and broad-area abrasion tests load the film differently. Choose the method that matches the failure and keep load, cycles, receptor, and evaluation consistent.
Ignoring additive interactions
Defoamers, wetting agents, waxes, silicones, and release additives can compete at the interface. Add one variable at a time in the first screen, then confirm the final package.
Frequently asked questions
Does a lower coefficient of friction always mean better converting?
No. A friction value can be too low for controlled winding, stacking, feeding, or registration. The correct target is a stable process window, not the lowest possible number.
Can the same additive improve slip and anti-blocking?
It may influence both, but the pass criteria remain separate. Use a friction method for slip and a conditioned contact method for blocking.
When should I choose 3307X instead of 3166?
Choose 3307X as the first comparison when cured-film scratch/abrasion performance and later recoating are central. Choose 3166 when dry feel and a broader surface-property balance are central. Confirm system compatibility and test both if the priorities overlap.
Request a slip-additive screening plan
Send the resin system, substrate pair, present and target friction values, cure conditions, downstream operation, current additive package, and required scratch or rub method. Ask Longchang Chemical for a focused slip-additive shortlist.