LNB16405
LNB16405 hardener for polyurethane coatings
Isocyanate hardener (second component) for MILESI polyurethane coatings, sold through Technocolor. The dealer describes it as 'the second component for polyurethane lacquers and enamels'. There's no product page on t-color.ru. It only appears there as an equal alternative to LNB71 in the LBR40, LBR43 and LBR45 PU-foam primers (20 % by weight / 30 % by volume). LNB71 is the adhesion-primer hardener (solids 50 ± 1 %). LNB16405 is a more general PU hardener for lacquers and enamels, but in the LBR primers it swaps one-for-one with LNB71 at the same dose.
- second component of the PU-foam/MDF primers LBR40 (white), LBR43 (walnut), LBR45 (mahogany) — 20 % by weight
- second component of MILESI polyurethane lacquers and enamels (per dealer description; specific bases and doses not published)
Ask about LNB16405
Answers are based on the LNB16405 data and the products it mixes with.
Mixing matrix
- LBR40base% by weight: 20 %official% by volume: 30 %official
LBR40 — white PU primer for PU foam and MDF. The official page lists the hardener as 'LNB71/LNB16405': either one, same dose — 20 % by weight (30 % by volume).
Fixed dose — weigh it. Don't blend the two hardeners in one mix.
- LBR43base% by weight: 20 %official% by volume: 30 %official
LBR43 — walnut-tinted PU primer for PU foam. The official page lists the hardener as 'LNB71/LNB16405': either one, same dose — 20 % by weight (30 % by volume).
Fixed dose — weigh it. Don't blend the two hardeners in one mix.
- LBR45base% by weight: 20 %official% by volume: 30 %official
LBR45 — mahogany-tinted PU primer for PU foam. The official page lists the hardener as 'LNB71/LNB16405': either one, same dose — 20 % by weight (30 % by volume).
Fixed dose — weigh it. Don't blend the two hardeners in one mix.
- LZC1051Thinner% by weight: 10–30 %official% by volume: 20–40 %official
Standard thinner for every LBR system on LNB16405: 10 % for maximum build on flat work, 20–30 % for verticals, carved PU-foam mouldings, or a tip smaller than 1.8 mm.
Add after the hardener and stir in.
| Role | Material | % by weight | % by volume | When |
|---|---|---|---|---|
| base | LBR40 | 20 %official | 30 %official | LBR40 — white PU primer for PU foam and MDF. The official page lists the hardener as 'LNB71/LNB16405': either one, same dose — 20 % by weight (30 % by volume).Fixed dose — weigh it. Don't blend the two hardeners in one mix. |
| base | LBR43 | 20 %official | 30 %official | LBR43 — walnut-tinted PU primer for PU foam. The official page lists the hardener as 'LNB71/LNB16405': either one, same dose — 20 % by weight (30 % by volume).Fixed dose — weigh it. Don't blend the two hardeners in one mix. |
| base | LBR45 | 20 %official | 30 %official | LBR45 — mahogany-tinted PU primer for PU foam. The official page lists the hardener as 'LNB71/LNB16405': either one, same dose — 20 % by weight (30 % by volume).Fixed dose — weigh it. Don't blend the two hardeners in one mix. |
| Thinner | LZC1051 | 10–30 %official | 20–40 %official | Standard thinner for every LBR system on LNB16405: 10 % for maximum build on flat work, 20–30 % for verticals, carved PU-foam mouldings, or a tip smaller than 1.8 mm.Add after the hardener and stir in. |
Percentages are per 100 parts of component A.
Characteristics
- Chemistry
- polyisocyanate hardener for 2K PU (aromatic vs aliphatic not stated)recommended
- Density
- ≈ 1.0 g/mlrecommended
- Pot life
- 2 hrecommended
- Lightfastness
- unknown; treat as not light-stable under clear/pale topcoatsrecommended
- Drying · Conditions
- 20 °C
Application
HVLP
- Nozzle
- 1.8–2
- Pressure · air · Inlet pressure, min
- 2
- Pressure · air · Inlet pressure, max
- 2.5
- Pressure · air · at the cap, max
- 0.7
- Consumption
- 120official
- Why ru
- LNB16405 встречается только в смеси с LBR40/43/45. Это тиксотропные пигментированные ПУ грунты: сухой остаток компонента A 70 ± 1 % (LBR40) / 68 ± 1 % (LBR45), вязкость 44 ± 2 с ВЗ-6 (дилер Holzcom/timb.ru), расход 120 г/м² (официально) — тот же класс, что PPS50277 владельца (сухой остаток 73 %), которому нужно 1,8–2,0 мм, а 1,5 мм мало. Давление на входе и на головке — по стандартным ограничениям HVLP (≤ 0,7 бар на головке).
Tip and pressure are chosen for the LBR primer mix, not the hardener. On a 1.5 mm tip thin with LZC1051 to 25–30 % and accept less build.
Airmix (air-assisted airless)
- Nozzle
- 0.28–0.33
- Pressure · fluid
- 60–100
- Pressure · air
- 1–2
- Why ru
- Тиксотропный пигментированный грунт с высоким сухим остатком: airmix с соплом 11–13 тыс. дюйма при 60–100 бар по материалу укладывает полные 120 г/м² без потёков; стандартная практика для этого класса; страница методов указывает airmix для высоковязких материалов.
For production runs of PU-foam mouldings. Thin 10–15 % with LZC1051.
Process and compatibility
- Mixing
- Weigh LBR primer (part A) 100, add LNB16405 20 by weight, stir, then LZC1051 10–30. Let it stand 5–10 min and strain (125–190 µm). Don't mix more than you'll spray in about 2 h.recommended
- Temperature and humidity
- 18–25 °C, RH max 70 %; in humid air the isocyanate reacts with water, which causes blushing and micro-bubbles.recommended
- Don'ts
- don't blend LNB16405 and LNB71 in one mix — pick one
- don't eyeball the dose: too little gives a soft film, too much makes it brittle
- don't use it in Technocolor PC/AC/EC-hardener systems without a test — compatibility isn't published
- don't leave the can open: it picks up moisture, goes cloudy and gels
Storage
- Storage temperature
- +5…+25 °C, tightly closed, dry placerecommended
- Packaging
- 5 L,25 Ldealer
Safety: Contains isocyanates and organic solvents. Spray only in an extracted booth, wearing an A2P2 respirator (air-fed is better), nitrile gloves and goggles. Highly flammable.
Sources
Value tags: “official”, “dealer”, “catalog”, “schedule” are Technocolor data; “workshop” is from our own datasheets; “recommended” is our engineering estimate (hover to see the reasoning).
- dealer page: MILESI hardener for PU coatings, 2nd component for PU lacquers and enamels; packs 5 L / 25 L
- second dealer (Holzcom/timb.ru): 'Отвердитель Полиуретановый Milesi LNB16405', 5 L pack (арт. LNB16405/5), no characteristics
- sister hardener LNB71: solids 50 ± 1 %
- LBR40: LNB71/LNB16405 20 wt% / 30 vol%; LZC1051 10–30 wt% / 20–40 vol%; spray 120 g/m²
- LBR43: same ratios
- LBR45: same ratios
- LBR40 dealer page (now 404): solids 70 ± 1 %, pot life 2 h (cached snippet, not re-verified)
- isocyanate hardeners: water-sensitive
- application methods
- LBR40 dealer (Holzcom/timb.ru): hardener LNB16405/LNB71 20 wt% / 30 vol%, LZC1051 10–30 / 20–40; solids 70 ± 1 %; 44 ± 2 s VZ-6; full dry 8 h
- LBR45 dealer (Holzcom/timb.ru): same ratios; solids 68 ± 1 %; 44 ± 2 s VZ-6; full dry 12 h
Not covered by the sources
- no official t-color.ru product page
- no MILESI/Technocolor TDS or SDS PDF found (session web-search budget exhausted; cached 'Milesi' PDFs were HTML error pages)
- aromatic vs aliphatic isocyanate type
- solids content
- viscosity
- measured density
- NCO content
- which MILESI lacquers/enamels (other than LBR40/43/45) use it, and at what dose
- shelf life (unopened)
- official storage temperature
- flash point / hazard classification
- not used in any official finishing schedule
- not in the 2025–26 Technocolor catalogue transcripts
- price: t-colormarket shows '1 230 ₽ (6 150 ₽/л)' — that works out to a 0.2 L unit, which does not match the 5 L / 25 L packs listed; pack/price unclear
- pot life of the LBR mix not re-verifiable (only a cached snippet of a now-404 dealer page)