LNB20
LNB20 hardener for polyurethane coatings
Milesi isocyanate hardener for two-pack polyurethane coatings. The dealer describes it as a 'hardener for PU primers and matt lacquers', the second component of PU materials, 'for use with the LBA and LGA series'. On the official Technocolor site it appears only as the hardener for the tinting-system converters: KGA1 (clear, 20 gloss) and KKR1 (white, 20 gloss) as the alternative to LNB77, and as the only hardener for LKR6AB16 (white PU converter, 10 gloss). Always 50 % by weight on the base. Compared with LNB77 it hard-dries faster (10–12 h instead of 12–18 h) and, per the Milesi TDS, holds its colour better — which is why it's the pick for whites and pale tints.
- second component of the KGA1 clear converter (20 gloss) — 50 % by weight
- second component of the KKR1 white converter (20 gloss) — 50 % by weight
- the only hardener for the LKR6AB16 white PU converter (10 gloss) — 50 % by weight
- per the dealer — LBA-series PU primers and LGA-series PU lacquers (the official LBA/LGA pages do not list LNB20 — check with Technocolor first)
Ask about LNB20
Answers are based on the LNB20 data and the products it mixes with.
Mixing matrix
- KGA1base% by weight: 50 %official% by volume: 50 %official
Clear 20-gloss converter — for pale and white tints where yellowing matters; faster than LNB77 (hard dry 12 h vs 18 h).
- KKR1base% by weight: 50 %official% by volume: 67 %official
White 20-gloss converter — alternative to LNB77; a bit faster (hard dry 10 h), sheen ~22.
- LKR6AB16base% by weight: 50 %official% by volume: 70 %official
White 10-gloss PU converter — the only listed hardener, always.
- LBA* / LGA*base% by weight: 50 %recommended
Only after checking with Technocolor: the official LBA/LGA pages list LNB77/LNB42/LNB5/LNB6/LNB21, not LNB20.
| Role | Material | % by weight | % by volume | When |
|---|---|---|---|---|
| base | KGA1 | 50 %official | 50 %official | Clear 20-gloss converter — for pale and white tints where yellowing matters; faster than LNB77 (hard dry 12 h vs 18 h). |
| base | KKR1 | 50 %official | 67 %official | White 20-gloss converter — alternative to LNB77; a bit faster (hard dry 10 h), sheen ~22. |
| base | LKR6AB16 | 50 %official | 70 %official | White 10-gloss PU converter — the only listed hardener, always. |
| base | LBA* / LGA* | 50 %recommended | — | Only after checking with Technocolor: the official LBA/LGA pages list LNB77/LNB42/LNB5/LNB6/LNB21, not LNB20. |
Percentages are per 100 parts of component A.
Characteristics
- Solids
- 25.0 ± 2 % by weight (hardener itself)datasheet
- Density
- 0.960–0.976 kg/ldatasheet
- Chemistry
- isocyanate (NCO) hardener for 2K PU; exact isocyanate type (aromatic TDI / aliphatic HDI / blend) not publisheddealer
- Lightfastness
- Good yellowing resistance (of the KGA1 + LNB20 mix)datasheet
- Pot life
- 3 hdatasheet
- Drying · Conditions
- 18–22 °C, 65–70 % RH, of the mix (TDS)
- Drying · Dust-free
- 10–15datasheet
- Drying · Touch-dry
- 30datasheet
- Drying · Overcoat (h)
- 2datasheet
- Drying · Full cure
- 10–12datasheet
- Drying · Sand or stack
- sand/denib after ≥ 12 h (overnight), stack/pack after ≥ 24 hrecommended
- Mixed solids %
- 38.7 ± 2 (KGA1) / 50.2 ± 2 (KKR1)datasheet
- Mixed viscosity
- 16 ± 2 s (KGA1) / 20 ± 2 s (KKR1)datasheet
- Moisture sensitivity
- Isocyanate hardeners are sensitive to water.official
Application
HVLP
- Nozzle · KGA1 mix
- 1.3–1.5
- Nozzle · KKR1 + LKR6AB16 mix
- 1.6–1.8 (typ. 1.7)
- Nozzle · Why ru
- LNB20 никогда не распыляют отдельно — сопло подбирают по смеси. KGA1 + LNB20 — жидкое, слабо пигментированное финишное покрытие (16 ± 2 с Ford 4, сухой остаток ~39 %), которое чисто распыляется соплом 1,3–1,5 мм. KKR1/LKR6AB16 + LNB20 — белые эмали с высоким сухим остатком (~50 % в смеси, 20 ± 2 с), которым нужно 1,6–1,8 мм, чтобы нанести 130–160 г/м² без «голодного» факела.
- Pressure · air · Inlet pressure, min
- 2
- Pressure · air · Inlet pressure, max
- 2.2
- Pressure · air · at the cap, max
- 0.7
- Pressure · air · Why ru
- Стандартная настройка HVLP (давление на входе при нажатом курке, ≤ 0,7 бар на воздушной головке), как в практике мастерской владельца.
- Spray viscosity
- 16–20 ± 2 sdatasheet
- Consumption
- 120–160datasheet
- Wet film
- 140datasheet
- Flash-off
- 10–15 (dust free)datasheet
- Recoat
- ≥ 2 hdatasheet
Weigh the hardener in at exactly 50 %, stir, then thin with LZC8643 and let it stand 5–10 min. The mix lives 3 h — only mix what you'll spray.
Conventional spray
- Nozzle
- 1.4–1.8recommended
- Pressure · air
- 3–4recommended
Airmix (air-assisted airless)
- Nozzle
- 0.23–0.28recommended
- Pressure · fluid
- 10–20official
- Pressure · air
- 1–2official
Electrostatic
- Nozzle
- as airmix (09–11 thou)recommended
Process and compatibility
- Temperature and humidity
- apply 15–30 °C, optimum 18–22 °C at 65–70 % RH; do not dry below 15 °C; RH during drying 50–70 %datasheet
- Don'ts
- don't eyeball it — weigh it, 50 %
- don't leave the can open: isocyanate reacts with air moisture, goes cloudy and thickens
- don't use hardener that has gone cloudy or thick
- don't mix with other hardener families (PC/AC), and don't swap it in for the listed LBA/LGA hardeners (LNB77/LNB42/LNB5/LNB6/LNB21) without Technocolor's OK
- don't use the mix past its 3 h pot life
- don't spray below 15 °C
Storage
- Shelf life
- ≈ 12 months in the sealed original canrecommended
- Storage temperature
- 0–35 °C, indoors, ventilated, out of direct sundatasheet
- Packaging
- 1 l, 2.5 l, 12.5 ldealer
Safety: Solvent-borne isocyanate hardener: highly flammable, isocyanate vapour/mist is a respiratory sensitiser. Spray booth, A2/P2 respirator or air-fed mask, nitrile gloves, goggles, spark-proof equipment, no smoking. See the LNB20 SDS.
Mixed into
KGA1 / KKR1 / LGA20 / LGA21 / LGA210 / LGA22 / LGA2AA43 / LGA2AA44 / LGA2AA45 / LGA2AA46 / LGA2AA47 / LGA6AB14 / LGA6AB16 / LKR6AB14 / LKR6AB16
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 card: properties, use, 'for LBA and LGA series', MILESI, density/solids (mislabelled), pack sizes
- Official KGA1: LNB77/LNB20 50 % w / 50 % v, LZC1026/LZC8643 20–30 %
- Official KKR1: LNB77/LNB20 50 % w / 67 % v, LZC8643 10–30 % w
- Official LKR6AB16: LNB20 50 % w / 70 % v, LZC8643/S80 20–30 % w
- Milesi KGA1x TDS: LNB20 density 0.960, solids 25 ± 2, 52.1 % v/v, pot life 3 h, drying 15/30 min, hard 12 h, overcoat 2 h, good yellowing resistance
- Milesi KKR1x TDS rev.3: LNB20 density 0.976, solids 25 ± 2, 62.8 % v/v, pot life 3 h, 20 s Ford 4, drying 10/30 min, hard 10 h, storage/application conditions
- Official glossary: isocyanate hardeners are water-sensitive
- Official application methods page
Not covered by the sources
- No official t-color.ru page for LNB20
- No standalone LNB20 TDS or SDS found — data taken from the Milesi KGA1 and KKR1 series TDS hardener blocks
- Isocyanate type (aromatic/aliphatic/blend) not published
- Hardener viscosity not published (dealer fields swapped: '0,98±0,03' = density, '25 ±1%' = solids)
- Hardener shelf life not published
- LBA/LGA use: dealer claims it, but no official LBA/LGA page lists LNB20 or a ratio
- Yellowing claim inconsistent: KGA1 TDS 'Good', KKR1 TDS none
- Volume % differs between official pages and TDS (KGA1 50 vs 52.1; KKR1 67 vs 62.8)
- LKR6AB16 + LNB20 mix: no pot life/drying published
- Not used in any official finishing schedule; not in the Technocolor 2025–2026 catalogue transcripts