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HardenersHardener

LNB500

LNB500 polyurethane hardener (Milesi)

Milesi polyurethane (isocyanate) hardener — component B. In the original Milesi TDS it is the standard hardener for the LGA531–535 thixotropic PU topcoat series (50 % by weight, pot life 3 h) and the alternative hardener for the LGA20 matt PU series (50 % instead of LNB77 — faster drying, harder film, gloss about 10 units lower). A Slovak Milesi dealer also lists it for the LBA528 sealer (alongside LNB42). Technocolor neither lists nor sells LNB500: for the same bases it gives LNB42/LNB77/LNB5 (LGA53x) and LNB77 (LGA20). Solids, density and isocyanate type are not published.

  • second component of the LGA531–LGA535 thixotropic PU topcoats (Milesi TDS, standard hardener)
  • second component of the LGA20/LGA21/LGA22/LGA210 matt PU lacquers when faster drying and higher hardness are wanted (Milesi LGA2x TDS)
  • second component of the LBA528 PU sealer (Slovak Milesi dealer)

Ask about LNB500

Answers are based on the LNB500 data and the products it mixes with.

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Mixing matrix

  • LGA531base
    % by weight: 50 %datasheet

    thixotropic PU topcoat, 65 gloss (LGA531–535 series); standard hardener per the Milesi TDS; thinner LZC1026 10–30 %

  • LGA532base
    % by weight: 50 %datasheet

    thixotropic PU topcoat, 45 gloss; Milesi TDS standard (pot life 3 h)

  • LGA533base
    % by weight: 50 %datasheet

    thixotropic PU topcoat, 30 gloss; Milesi TDS standard

  • LGA534base
    % by weight: 50 %datasheet

    thixotropic PU topcoat, 20 gloss; Milesi TDS standard

  • LGA535base
    % by weight: 50 %datasheet

    thixotropic PU topcoat, 10 gloss; Milesi TDS standard

  • LGA20base
    % by weight: 50 %datasheet

    LGA20-series matt PU lacquer — instead of LNB77 when faster drying and higher hardness are wanted; gloss ~10 units lower

  • LGA21base
    % by weight: 50 %datasheet

    as for LGA20 (LGA2x series)

  • LGA22base
    % by weight: 50 %datasheet

    as for LGA20 (LGA2x series)

  • LGA210base
    % by weight: 50 %datasheet

    as for LGA20 (LGA2x series)

  • LBA528base
    % by weight: 50 %dealer

    LBA528 PU sealer (electrostatic/spray); Slovak Milesi dealer gives LNB42 or LNB500 at 50 %; thinner LZC1026, LZC13 for electrostatic

Percentages are per 100 parts of component A.

Characteristics

Solids · Gap
yes
Effect vs LNB77
On the LGA20 series: faster drying and higher hardness, gloss about 10 units lower than with LNB77.datasheet
Filling
Fills less than LNB42: the TDS recommends LNB42 (50 %) instead of LNB500 for better filling.datasheet
Pot life
3 hdatasheet
Drying · Conditions
20 °C, 70 % RH (TDS footer)
Drying · LGA531/535
dust free 15 min / touch dry 45 min / hard dry 4 hdatasheet
Drying · Electrostatic schedule
LGA531–535 + 50 % LNB + 25–30 % LZC13: dry in 40–45 min, hard after 24 h.schedule
Lightfastness
Isocyanate type not published. Until it's confirmed non-yellowing, don't use it under whites/pale enamels.recommended
Moisture sensitivity
Isocyanate hardeners are water-sensitive — lid straight back on.official

Application

Electrostatic

Nozzle
0.28–0.33 mm (airmix electrostatic tip, 11–13 thou)recommended
Pressure · fluid
20 barofficial
Pressure · air
1–2 barofficial
Spray viscosity
16–20 s DIN4recommended
Consumption
80–100 g/m²datasheet
Coats
1 coatsschedule
Flash-off
15 min (dust free)datasheet

Parameters refer to the mix: base + 50 % LNB500 + 10–30 % thinner.

HVLP

Nozzle
1.5–1.7 mmrecommended
Pressure · air · Inlet pressure
2–2.2 barrecommended
Pressure · air · Cap
≤ 0.7 barrecommended
Spray viscosity
18–20 s DIN4recommended
Consumption
80–100 g/m²datasheet
Coats
1–2 coatsrecommended
Flash-off
15 min (dust free)datasheet

For better filling the TDS suggests LNB42 instead of LNB500.

Process and compatibility

Goes with
LGA531, LGA532, LGA533, LGA534, LGA535, LGA20, LGA21, LGA22, LGA210, LBA528
Temperature and humidity
18–25 °C, RH ≤ 70 %recommended
Don'ts
  • don't change the 100:50 ratio
  • don't leave the tin open — isocyanate reacts with air moisture
  • don't blend with other LNB hardeners in one mix without a test
  • don't use with acrylic/polyester materials

Storage

Shelf life
≈ 6–12 months sealedrecommended
Storage temperature
18–25 °C, tightly closed, protected from moisturedatasheet

Safety: Contains isocyanates and solvents: flammable, harmful vapour, can sensitise the airways. Booth with extraction, A2 respirator (A2P2 or air-fed when spraying), gloves, goggles.

Mixed into

LBA528 / LGA20 / LGA21 / LGA210 / LGA22 / LGA531 / LGA532 / LGA533

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).

Not covered by the sources
  • Not a Technocolor-listed product: no t-color.ru page, not in the catalog transcripts, no t-colormarket.ru listing (search LNB500 returns nothing)
  • No LNB500 TDS/SDS found; solids, density, viscosity, NCO content, isocyanate type unpublished
  • pct by volume not published
  • Shelf life and packaging not published
  • Availability in Russia unconfirmed — use Technocolor's listed hardeners (LNB42/LNB77/LNB5) unless sourced directly from Milesi