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HardenersHardener

LNB5

LNB5 polyurethane hardener (Milesi), electrostatic grade

Milesi polyurethane (isocyanate) hardener — component B for the LGA531–LGA536 thixotropic PU lacquers and the LBA521 thixotropic PU sealer. Technocolor lists it alongside LNB42/LNB77 (lacquers) and LNB77 (sealer), always at 50 % by weight and by volume. It has no page on t-color.ru and isn't stocked at t-colormarket.ru. Per Milesi dealers, LNB5 (a.k.a. LNB05) is the hardener for electrostatic bell/disc application and for jobs that need extra wetting/flow-out. Solids, viscosity and isocyanate type are not published.

  • second component of the LGA531 (65 gloss), LGA532 (45), LGA533 (30), LGA534 (20), LGA535 (10), LGA536 (3 gloss) thixotropic PU lacquers
  • second component of the LBA521 thixotropic PU sealer
  • electrostatic bells and discs; anywhere extra wetting is needed (Milesi dealer)

Ask about LNB5

Answers are based on the LNB5 data and the products it mixes with.

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Mixing matrix

  • LBA521base
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU sealer (electrostatic / spray); thinner LZC1026/LZC1051 10–30 %

  • LGA531base
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer, 65 gloss (LGA531–536 series); LNB5 is one of three listed hardeners (LNB42/LNB77/LNB5); thinner S50/S70/S80 10–30 %

    Pick LNB5 when the lacquer goes through an electrostatic bell/disc or you need better wetting/flow; for ordinary spraying the Milesi dealer lists LNB42 or LNB77.

  • LGA532base
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer, 45 gloss (LGA531–536 series); LNB5 is one of three listed hardeners (LNB42/LNB77/LNB5); thinner S50/S70/S80 10–30 %

    Pick LNB5 when the lacquer goes through an electrostatic bell/disc or you need better wetting/flow; for ordinary spraying the Milesi dealer lists LNB42 or LNB77.

  • LGA533base
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer, 30 gloss (LGA531–536 series); LNB5 is one of three listed hardeners (LNB42/LNB77/LNB5); thinner S50/S70/S80 10–30 %

    Pick LNB5 when the lacquer goes through an electrostatic bell/disc or you need better wetting/flow; for ordinary spraying the Milesi dealer lists LNB42 or LNB77.

  • LGA534base
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer, 20 gloss (LGA531–536 series); LNB5 is one of three listed hardeners (LNB42/LNB77/LNB5); thinner S50/S70/S80 10–30 %

    Pick LNB5 when the lacquer goes through an electrostatic bell/disc or you need better wetting/flow; for ordinary spraying the Milesi dealer lists LNB42 or LNB77.

  • LGA535base
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer, 10 gloss (LGA531–536 series); LNB5 is one of three listed hardeners (LNB42/LNB77/LNB5); thinner S50/S70/S80 10–30 %

    Pick LNB5 when the lacquer goes through an electrostatic bell/disc or you need better wetting/flow; for ordinary spraying the Milesi dealer lists LNB42 or LNB77.

  • LGA536base
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer, 3 gloss (LGA531–536 series); LNB5 is one of three listed hardeners (LNB42/LNB77/LNB5); thinner S50/S70/S80 10–30 %

    Pick LNB5 when the lacquer goes through an electrostatic bell/disc or you need better wetting/flow; for ordinary spraying the Milesi dealer lists LNB42 or LNB77.

  • LGA531 / LGA532 / LGA533 / LGA534 / LGA535 / LGA536base
    % by weight: 50 %dealer

    Recommended for electrostatic bells and discs, or wherever extra wetting is needed.

    The Ukrainian Milesi dealer (LGA532/533 page, notes for the LGA 531÷536 series) writes 'LNB 5/05 (electrostatics)', i.e. LNB5 = LNB05 in Milesi numbering; thinner given there is LZC1026. Alternatives on that page: LNB42, LNB77 (normal spray), LNB36 (faster dry, better vertical hold), LNB06 (better fill/softness).

  • LBA528base
    % by weight: 50 %schedule% by volume: 50 %schedule

    Milesi electrostatic schedule (Bulgarian distributor): LBA528 sealer + 50 % LNB05 or LNB06 (higher solids) + 20–25 % LZC13; dries 30–45 min, sand after 3 h at P280–320.

    Technocolor does not pair LBA528 with LNB5: the official LBA528 page gives LNB6/LNB77 50 % (by weight and volume). The LNB05 pairing is from the Bulgarian Milesi distributor's schedule.

  • LZC13Thinner

    Electrostatic spraying of LGA531–535 with an LNB-series hardener.

  • S50 / S70 / S80Thinner
    % by weight: 10–30 %official% by volume: 10–30 %official

    for LGA531–536

  • LZC1026 / LZC1051Thinner
    % by weight: 10–30 %official% by volume: 10–30 %official

    for LBA521

Percentages are per 100 parts of component A.

Characteristics

Solids · Gap
yes
Wetting
Improved wetting — recommended for electrostatic bells and discs.dealer
Pot life · By base
3 h, 2 h
Pot life · Working
2–3 h at 20 °Crecommended
Pot life · Definition
time for the mixed viscosity to double (Ford cup, 20 °C)official
Drying · Conditions
20 °C
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 or on pale timber in strong light.recommended
Moisture sensitivity
Isocyanate hardeners are water-sensitive — lid straight back on.official
Hardener specific gravity
0.973 g/mldealer

Application

Electrostatic

Nozzle
0.28–0.33 mm (airmix electrostatic tip, 11–13 thou)recommended
Pressure · fluid
40–60 barrecommended
Pressure · air
1–2 barofficial
Spray viscosity
16–20 s DIN4recommended
Consumption · By base
80–100 g/m², 110–130 g/m², 150 g/m²

Earth the part (methods page). LNB5 is the hardener for bells and discs (better wetting, Milesi dealer). Per the Milesi schedule, sand the sealer after 3 h and lacquer within 4 h of sanding.

HVLP

Nozzle
1.5–1.8 mmrecommended
Pressure · air
1.8–2.2 bar inletrecommended
Spray viscosity
18–22 s DIN4recommended
Consumption · By base
80–100 g/m², 110–130 g/m², 130–150 g/m²

For hand spraying LNB5 isn't required — LNB42/LNB77 do the job. Use LNB5 if the LNB77 mix isn't flowing out well.

Airmix (air-assisted airless)

Nozzle
0.23–0.33 mm (09–13 thou)recommended
Pressure · fluid
50–70 barrecommended
Pressure · air
1–2 barofficial
Consumption · By base
80–100 g/m², 110–130 g/m², 130–150 g/m²

Process and compatibility

Goes with
LBA521, LGA531, LGA532, LGA533, LGA534, LGA535, LGA536
Temperature and humidity
18–25 °C, RH ≤ 70 %recommended
Don'ts
  • don't change the 100:50 ratio — under- or over-catalysing ruins the film
  • don't leave the tin open — the isocyanate reacts with air moisture
  • don't blend LNB5 with LNB42/LNB77 in one mix without a test
  • don't use it with acrylic (ATL/ATS) or polyester materials — they have their own hardeners (AC40/AC200, EC1/EC2)

Storage

Shelf life
≈ 6–12 months sealedrecommended
Storage temperature
+5…+30 °C, dry, tightly closedrecommended

Safety: Contains isocyanates and solvents: flammable, harmful vapour, can sensitise the airways. Spray in a booth with extraction, wear an A2 carbon respirator (A2P2 or air-fed when spraying), gloves and goggles.

Mixed into

LBA521 / LGA531 / LGA532 / LGA533 / LGA534 / LGA535 / LGA536

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
  • No official t-color.ru page and no t-colormarket.ru listing (searches LNB5, LNB05, LNB 5, LNB500 return no LNB5 product)
  • No Milesi/Technocolor TDS or SDS found for LNB5/LNB05 (faichim and edid-milesi.bg URL patterns 404; web-search budget exhausted)
  • solids %, density, viscosity, isocyanate type (aromatic/aliphatic), NCO content not published
  • Pot life and drying times with LNB5 specifically not published (series data are with LNB500 or unspecified)
  • Shelf life and packaging sizes not published
  • Identity LNB5 = LNB05 rests on dealer spelling 'LNB 5/05'; relation to LNB500 (used in the LGA532 TDS) unconfirmed
  • Not used in any official Technocolor finishing schedule (information/technology pages)