{"id":10916,"date":"2026-07-28T00:00:41","date_gmt":"2026-07-28T00:00:41","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10916"},"modified":"2026-08-09T14:19:24","modified_gmt":"2026-08-09T14:19:24","slug":"3071-vs-3345-vs-3467","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/tr\/3071-vs-3345-vs-3467\/","title":{"rendered":"3071 vs 3345 vs 3467: Wetting, Flow & PU Gate"},"content":{"rendered":"

3071 vs 3345 vs 3467<\/strong> is a mechanism-and-evidence comparison. 3071 is a wetting route with an explicit waterborne foam warning and no public active-content value. 3345 is a 100%-active wetting\/leveling route. 3467 has multiple dose bases and belongs behind a polyurethane chemistry gate when reaction is claimed.<\/p>\n

\n
\n
3071<\/strong>
Substrate wetting with foam risk.<\/div>\n
3345<\/strong>
Documented wetting and leveling.<\/div>\n
3467<\/strong>
Compatibility or PU modification behind exact chemistry.<\/div>\n<\/div>
Original 3071\/3345\/3467 map: choose wetting, flow or a documented reaction route.<\/figcaption><\/figure>\n

Compare current public facts<\/h2>\n\n\n\n\n\n\n\n
S\u0131n\u0131f<\/th>\nPublished dose\/system<\/th>\nPrimary question<\/th>\nCritical boundary<\/th>\n<\/tr>\n<\/thead>\n
3071<\/a><\/td>\n0.1\u20131.0% total; water\/solvent\/UV<\/td>\nWetting and spread<\/td>\nNo public active value; may stabilize foam in waterborne systems<\/td>\n<\/tr>\n
3345<\/a><\/td>\n100% active; 0.1\u20131.0%; water\/solvent\/UV<\/td>\nWetting and leveling<\/td>\nMust preserve crater resistance, adhesion and recoat<\/td>\n<\/tr>\n
3467<\/a><\/td>\n100% active; solvent 0.05\u20131%; resin modification 0.5\u20135% resin; waterborne 0.5\u20135% total<\/td>\nCompatibility or documented PU modification<\/td>\nOH \u226485 mg KOH\/g is not an exact stoichiometric value<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Use 3071 for measured wetting<\/h2>\n

Screen low to high within 0.1\u20131.0% at fixed substrate, viscosity, film build and application. Measure retraction, craters, edge coverage and adhesion. Record wet density and foam decay because the page warns of foam stabilization. Do not convert dose to active basis without current supplier data.<\/p>\n

Use 3345 for controlled leveling<\/h2>\n

3345 supplies a clear 100%-active basis and 0.1\u20131.0% range. Compare flow, orange peel, gloss and sag while checking adhesion and recoat. Any-stage addition does not prove grind, letdown and post-addition are equivalent; record stage, predilution and shear.<\/p>\n

Do not mix 3467 dose bases<\/h2>\n

The page gives three different bases for solvent coating, resin modification and waterborne coating. A percentage of resin is not a percentage of total formula. Write every trial in grams, product-as-supplied basis and total or resin denominator so a plant batch can be reproduced.<\/p>\n

Require exact PU reaction data<\/h2>\n

For polyurethane modification, obtain exact batch OH, resin OH, isocyanate equivalent, solids and target NCO\/OH. The upper-limit OH value cannot support a precise calculation. Record induction, pot life and cure. Outside a documented PU route, treat 3467 only as an evidence-gated compatibility candidate.<\/p>\n

Use a single-variable matrix<\/h2>\n\n\n\n\n\n\n\n\n
Set<\/th>\nChange<\/th>\nPrimary measure<\/th>\nRelease gate<\/th>\n<\/tr>\n<\/thead>\n
A<\/td>\nControl<\/td>\nWetting, leveling, foam and cure<\/td>\nAdhesion\/recoat<\/td>\n<\/tr>\n
B\u2013D<\/td>\n3071 low\/mid\/high<\/td>\nEntry and coverage<\/td>\nFoam and adhesion<\/td>\n<\/tr>\n
E\u2013G<\/td>\n3345 low\/mid\/high<\/td>\nFlow and gloss<\/td>\nSag, crater and recoat<\/td>\n<\/tr>\n
H\u2013J<\/td>\n3467 after data approval<\/td>\nCompatibility\/reaction<\/td>\nPot life, cure and durability<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Prepare uniform films<\/h2>\n

ASTM D823<\/a> describes practices for uniform films. Fix substrate, application, film thickness, temperature, humidity and cure. Production spray or roll trials must follow drawdown screening because dynamic wetting depends on application energy.<\/p>\n

Measure gloss without confusing it with cure<\/h2>\n

ASTM D523<\/a> covers specular gloss. Record geometry and film condition. Improved gloss can reflect flow or surface segregation and does not prove cure, adhesion or chemical resistance.<\/p>\n

Check adhesion and recoat<\/h2>\n

ASTM D3359<\/a> provides tape adhesion methods. Test the intended coating stack at target and extended recoat intervals, document failure location and follow the project method limits. Surface-active material may improve appearance but weaken the next interface.<\/p>\n

Test interactions only after individual routes<\/h2>\n

Do not combine 3071 and 3345 during the first screen. Their surface effects can overlap, and 3071 can add a foam variable. Establish minimum effective levels separately, then use a small factorial design only if two independent defects remain. Keep an unchanged control through aging.<\/p>\n

Repeat the preferred dose at both the lower and upper production viscosity limits. A candidate that works only in one laboratory drawdown may fail when temperature, line speed or application shear moves. Record the process window instead of reporting a single best-looking panel.<\/p>\n

Normalize concentration and supplier documents<\/h2>\n

3071 lacks a public active-content value, while 3345 and 3467 state 100% active. Do not compare the same as-supplied percentage as though the active amounts are known to be equal. Obtain current TDS and COA, record lot number, density and stated active basis, and calculate grams per batch from the approved denominator.<\/p>\n

Verify whether product codes, brand family and revision dates on containers match the documents used by the lab. A historical page or alternative-brand table is not a batch specification. Retain reference samples so unexpected foam, haze or cure behavior can be investigated later.<\/p>\n

Define defect acceptance before ranking<\/h2>\n

Set maximum crater count, minimum wetting\/coverage, acceptable gloss or leveling, wet-density change, foam-decay time, adhesion rating and recoat result before viewing panels. Predetermined limits prevent an attractive surface from outweighing a cure, foam or interface failure and make plant transfer auditable.<\/p>\n

Decision rules<\/h2>\n