3252 vs 3367 vs 5005-60 must be decided by system and reaction evidence before feel or anti-graffiti claims. The 3252/3253/3254/3255 family is a UV/solvent-free, non-water route. 3367 spans UV, solvent and water systems and is positioned for polyurethane modification. 5005-60 is a water-only, 50–60%-active pre-emulsion.
All three pages use reactive-hydroxyl language, but none publishes a hydroxyl value or equivalent weight. Do not calculate NCO/OH or other crosslinker demand from marketing descriptions.
System-and-reaction decision map
| Formulation route | First candidate | Mandatory evidence |
|---|---|---|
| UV or solvent-free system; water is excluded | Familie 3252 | Variant identity, OH/equivalent data, clarity and solvent-incorporation fit |
| PU modification or broad UV/solvent/water compatibility | 3367 | Actual reaction role, OH data and NCO/OH impact |
| Water-only resin needs hand feel/anti-graffiti route | 5005-60 | 50–60% active correction, cure contribution and storage stability |
| Transparent coating cannot tolerate haze | Blank plus compatibility screen | Do not approve 3252 family before clarity testing |
| Route | Published system/data | Dosage/incorporation | Evidence gap |
|---|---|---|---|
| Familie 3252 | Carbon-hydroxyl modified polysiloxane; UV/solvent-free; not waterborne | 0.1–1.0% total; suitable-solvent predilution; benzene/mineral-oil solvents listed | No public active %, OH value or variant-by-variant selection table; acrylic-turbidity warning |
| 3367 | 100% active; UV/solvent/water; hydroxyl–NCO reaction claimed | Solvent 0.05–1%; resin modification 0.5–5% on resin; water 0.5–5% total | No public OH value/equivalent; three dose bases must not be mixed |
| 5005-60 | Water-only polysiloxane pre-emulsion; 50–60% active; six-month shelf life | 1–3% total; any-stage or post-addition | Qualitative OH claim with no OH value/equivalent |
Start with the non-negotiable system boundary
Do not put 5005-60 into a solvent or UV shortlist; its page marks both unavailable. Do not put the 3252 family into a waterborne shortlist. 3367 has the broadest system checkmarks, but that does not make its dose or reaction demand universal.
Record resin chemistry, solvents/water, solids, crosslinker, target cure, film clarity and downstream operations before ranking surface effects.
Use the 3252 family only after variant clarification
The shared page groups 3252, 3253, 3254 and 3255 under one description and one 0.1–1.0% range. It does not publish how the four variants differ, their active contents or hydroxyl values. Request variant-specific TDS/CoA data before choosing among them.
The page warns that the family may cause turbidity in acrylic resins, especially transparent systems. Compare clarity, haze, color and storage, and confirm how a product labeled for solvent-free systems should be incorporated when solvent predilution is also instructed.
Use 3367 with the correct dosage basis
3367 is 100% active and described as reacting with isocyanate in polyurethane. Its page presents three different routes: 0.05–1% of total formula for solvent coatings, 0.5–5% on resin for resin modification and 0.5–5% of total formula for waterborne use.
Choose the intended route before calculating addition. Obtain quantitative OH data and include the additive in the NCO/OH balance when it is used reactively. Then recheck pot life, cure, hardness and chemical resistance.
Correct 5005-60 for active content
5005-60 is a gray-to-milky waterborne pre-emulsion with 50–60% active content and a 1–3% total-formula range. Equal supplied-product dose does not equal the active silicone delivered by 100%-active 3367.
Its page claims reactive OH functionality but gives no OH value. Treat durable fixation as unquantified until current data and cure testing support it. Check freeze/heat storage and emulsion compatibility across the six-month shelf-life window.
Run a reaction-aware trial
- Prepare a blank and compact ladder using the correct system-specific dose basis.
- Report supplied-product and active addition separately.
- Hold crosslinker equivalents, solids, solvent/water and addition order.
- Track pot life, viscosity, clarity, leveling, craters, gloss and foam.
- Cure at low/target/high process conditions and repeat after storage.
Measure cure and surface durability separately
ASTM D5402 provides a solvent-rub comparison for coatings that chemically change during cure, but does not alone prove full cure. ASTM D4060 measures abrasion resistance of organic coatings on plane rigid surfaces.
Pair these with adhesion, hardness, gloss/haze, color, scratch, blocking, chemical/water resistance and recoat. A smoother film that changes stoichiometry, shortens pot life or clouds a clear resin does not pass.
Common comparison errors
Treating “reactive” as quantitative data
A qualitative hydroxyl statement does not provide equivalents. Obtain OH value, active content and the supplier’s intended reaction route before crosslinker calculation.
Comparing equal product percentages
3367 is 100% active and 5005-60 is 50–60% active; the 3252 page does not publish an active percentage. Report both product and active levels.
Assuming the four 3252 variants are identical
A shared page is not a variant-selection table. Confirm composition, viscosity, functionality, system fit and optical risk for the exact product supplied.
Ignoring addition-route solvents
Keep any predilution solvent visible in solids, VOC, cure and compatibility comparisons. A solvent contribution can falsely improve leveling or viscosity.
Request quantitative reaction data
Send system type, resin OH/acid functionality, crosslinker and target index, solids, water/solvent, cure, current additives, clarity, feel, release/anti-graffiti and durability requirements. Ask Longchang Chemical for variant-specific 3252-family data and OH/equivalent guidance for all three routes.