3367 vs 3500 vs 3565 is not a comparison of three identical reactive leveling additives. CHLUMIAG® 3367 has a documented hydroxyl/isocyanate polyurethane reaction route. CHLUMIAG® 3500 has documented acrylic functional groups for radiation cure. CHLUMIAG® 3565 is publicly described as a PU-leather release, feel, wetting and leveling product, but its page does not document a reactive group or network-incorporation mechanism.
Start with chemistry and end use, then confirm current TDS data. “Add before curing agent” does not by itself prove that an additive consumes curing agent.
Reaction-route decision map
| Formulation question | Published evidence | First route |
|---|---|---|
| PU modification needs a hydroxyl/NCO grafting route | 3367 page documents hydroxyl reaction with isocyanate | 3367 with stoichiometry review |
| Radiation cure needs acrylic-functional surface control | 3500 page documents reactive acrylic groups and crosslinking | 3500 with UV conversion review |
| Dry-process PU leather needs release/feel/wetting | 3565 page documents PU compatibility, release and pinhole risk | 3565 as a performance trial, not assumed reactive |
| Mechanism is required for a specification | Public data is incomplete or contradictory | Obtain current individual TDS before selection |
| Product | Documented role | Published use | Main guardrail |
|---|---|---|---|
| CHLUMIAG® 3367 | Reactive PU leveling/modification through hydroxyl and NCO | Solvent 0.05–1% total; resin modification 0.5–5% resin; waterborne 0.5–5% total | Current OH value and NCO/OH balance required; avoid additive mixtures |
| CHLUMIAG® 3500 | Acrylic-functional radiation-cure leveling | 0.05–1% total; UV, solvent and water-based; any stage/later | UV conversion, light/heat storage and mixing compatibility |
| CHLUMIAG® 3565 | PU-leather release, feel, wetting and leveling route | Water-dispersible/oil-soluble; before curing agent | Reactive mechanism not published; two dosage ranges conflict; pinhole risk |
3367 is the documented polyurethane reaction route
The 3367 page states that hydroxyl groups can react with isocyanates and that it can be added with the polyol during PU prepolymerization or later. This supports a PU reaction route, but the public page does not provide a current hydroxyl value for stoichiometric calculation.
Before a 2K or prepolymer trial, obtain the current TDS and include additive hydroxyl demand in the NCO/OH balance. Measure viscosity, exotherm, pot life, gel time, cure, adhesion, flex, scratch, abrasion, feel and migration. A published dosage is not a substitute for reaction accounting.
3500 is the documented radiation-cure route
The 3500 page identifies reactive acrylic functional groups and crosslinking within a radiation-cured polymer network. Its supported 0.05–1% range is easier to screen, but its broad system table does not mean every waterborne or solvent coating uses the same cure mechanism.
In UV work, record oligomer, monomer, photoinitiator, pigment, oxygen exposure, lamp spectrum, dose, irradiance and film build. Compare surface and through-cure, adhesion, rub, blocking and recoat after identical conditioning.
3565 should not be called reactive from public data
The 3565 page describes polyether-modified polysiloxane and a customized dry-process PU-leather release/feel route. It says to add the product before curing agent, but does not identify a reactive functional group, equivalent weight or network incorporation.
The page also shows both 0.05–1% and 0.02–3% total-formulation guidance. Do not resolve that conflict by guessing. Obtain the current product-specific TDS, confirm the basis, and treat pinhole testing as mandatory.
Do not transfer “reactive” across the family
Website category labels can group anti-sticking, release and reactive additives together. They do not prove that every listed product consumes NCO or participates in acrylate polymerization. Product-specific composition, functional group, equivalent value and curing evidence control the claim.
Build three different trial plans
- 3367: blank plus compact dosage ladder, with NCO/OH correction and pot-life monitoring.
- 3500: fixed UV dose and film build, with conversion-sensitive cure and rub checks.
- 3565: fixed PU slurry, release paper and cure, with release, residue, pinhole, feel and adhesion checks.
- Never mix first. Each public page warns against or urges caution with additive combinations.
- Age specimens. Recheck migration, adhesion, blocking and feel after heat, humidity or storage.
Use methods within their limits
ASTM D5402 can compare solvent resistance as chemically changing coatings cure, but solvent resistance alone does not establish full cure. ASTM D3359 provides a limited tape-adhesion rating and cannot distinguish high adhesion levels. ASTM D4060 can compare abrasion of coatings on rigid panels when wheel, load, resurfacing and film construction are controlled.
For PU leather, add production-specific flex, release force, paper residue, texture replication, hydrolysis and repeated-release cycles. For UV coating, add dose, conversion, oxygen inhibition, yellowing and downstream adhesion.
Common comparison errors
Treating addition before curing agent as proof of reaction
Addition sequence is process guidance. A reactive claim needs a functional group and curing mechanism.
Ignoring 3367 stoichiometry
If hydroxyl groups consume isocyanate, the current OH value belongs in the formulation balance.
Choosing 3565 from a single dosage number
The public page carries two ranges. Confirm the current TDS rather than selecting the convenient one.
Request a chemistry-matched comparison
Send the resin and curing chemistry, system type, solids, current additives, reaction ratio, UV equipment where applicable, substrate, application, cure schedule, target feel/release/leveling, and pot-life, adhesion, pinhole, rub, abrasion and durability limits. Ask Longchang Chemical for current 3367, 3500 and 3565 TDS guidance.