Skip to content
Dugan Design
← All products
+ Add with a base product
HardenersHardener

PC20

PC20 hardener for PU coatings

Aromatic (isocyanate) hardener with fairly high reactivity and drying speed. The main second component for Technocolor polyurethane primers (clear and pigmented) and matt/satin PU lacquers. Compared with PC25 it gives a more elastic film but dries slightly slower. The catalogue puts it in the aromatic group for PU primers and matt lacquers; on yellowing resistance it ranks third from the bottom of ten (better than PC72 and PC10, worse than PC90, PC25, PC60 and the aliphatics). For white and pale finishes where colour stability matters Technocolor offers PC60 instead.

  • second component of clear PU primers: PTS20, PTS50, PTS50 A, PTS52, PTS60, PTS20700, PTS21812, PTS10, PTS01
  • second component of pigmented PU primers: PPS10, PPS20, PPS40, PPS40091, PPS50, PPS50277, PPS01
  • second component of matt and satin PU lacquers: PTL10, PTL20, PTL50, PTL80, PTL01, PTL1 converter
  • ready-made PPL R**** M PU enamels and PPL01 fire-retardant enamel

Ask about PC20

Answers are based on the PC20 data and the products it mixes with.

Questions and answers are stored to improve the assistant and prevent abuse; the question text is processed by Anthropic (USA). Privacy policy

Mixing matrix

  • PPS20base
    % by weight: 50 %official% by volume: 70 %official

    white universal PU primer

    Dealer: PC20 gives a more elastic film, PC25 dries faster. S50: official page 10–20 %, dealer and catalogue 20–30 %.

  • PPS40base
    % by weight: 25 %official% by volume: 35 %official

    white/coloured PU primer for PU foam and MDF (alternative PC20042 at 20 wt% / 30 vol%)

  • PPS40091base
    % by weight: 25 %official% by volume: 35 %official

    black PU primer

    Dealer page for PPS40091 lists PC25 at 30 wt% / 40 vol% (S50 10–20 %), not PC20 — official page and catalogue: PC20 25 %.

  • PPS50base
    % by weight: 50 %official% by volume: 70 %official

    white thixotropic PU primer

  • PPS50277base
    % by weight: 30 %dealer% by volume: 45 %dealer

    white thixotropic high-solids PU primer (73 %) — lower dose than usual

    Dealer: alternative C72 (PC72) at 20 wt% (more elastic, slower drying). PC21 at 30 % comes from the owner datasheet. Dealer gives part A solids 72 ± 1 % (catalogue 73 %).

  • PTL1 Mbase
    % by weight: 50 %official% by volume: 50 %official

    clear matt PU converter (20 gloss) for tinting

  • PTL20 Mbase
    % by weight: 50 %official% by volume: 50 %official

    universal PU lacquer 20 gloss

  • PTL20 SMbase
    % by weight: 50 %official% by volume: 50 %official

    universal PU lacquer 30 gloss

  • PTL20 UMbase
    % by weight: 50 %official% by volume: 50 %official

    universal PU lacquer 10 gloss

  • PTL20 DMbase
    % by weight: 50 %dealer% by volume: 50 %dealer

    universal PU lacquer 5 gloss

  • PTL50 Mbase
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer 20 gloss

  • PTL50 SMbase
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer 30 gloss

  • PTL50 SGbase
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer 40 gloss

  • PTL50 Gbase
    % by weight: 50 %official% by volume: 50 %official

    thixotropic PU lacquer 60 gloss

  • PTL50 UMbase
    % by weight: 50 %catalog

    thixotropic PU lacquer 10 gloss

  • PTL50090base
    % by weight: 50 %catalog

    thixotropic PU lacquer 90 gloss

  • PTS20base
    % by weight: 50 %official% by volume: 50 %official

    clear universal PU primer

  • PTS50base
    % by weight: 50 %official% by volume: 50 %official

    clear thixotropic PU primer

  • PTS50 Abase
    % by weight: 50 %official% by volume: 50 %official

    clear thixotropic high-solids PU primer

  • PTS52base
    % by weight: 50 %official% by volume: 55 %official

    thixotropic high-solids PU primer

  • PTS60base
    % by weight: 50 %official% by volume: 60 %official

    clear high-hardness PU primer (catalogue lists only PC25 at 60 %)

  • PTS10base
    % by weight: 40 %catalog

    economy clear PU primer, sandable after 2 h (with PC10 at 50 %)

    Previously mislisted as PTS71: catalogue and official page give PTS71 with PC72 50 % only.

  • PTS20700base
    % by weight: 50 %catalog% by volume: 60 %dealer

    clear high-solids PU primer (57 %)

  • PTS21812base
    % by weight: 40 %catalog

    adhesion PU primer for MDF (with PC72 at 30 %)

  • PPS10base
    % by weight: 30 %catalog

    economy white PU primer (with PC10 at 40 %)

  • PTL10base
    % by weight: 40 %catalog% by volume: 40 %dealer

    fast-drying PU lacquer

  • PTL80 Mbase
    % by weight: 40 %catalog

    PU self-sealing lacquer, low grain raise (with PC10 at 50 %)

  • PTS01base
    % by weight: 50 %catalog

    fire-retardant clear PU primer

  • PPS01base
    % by weight: 50 %catalog

    fire-retardant white PU primer

  • PTL01base
    % by weight: 50 %catalog

    fire-retardant PU lacquer 20 gloss

  • PPL01base
    % by weight: 50 %catalog

    fire-retardant white PU enamel 20 gloss

  • PPL R**** Mbase
    % by weight: 50 %dealer% by volume: 60 %dealer

    ready-made RAL PU enamels (matt), e.g. PPL R9005 M

  • PPL20base
    % by weight: 50 %schedule

    Schedule 'Finishing PU-foam parts (PU)', step 4: intermediate primer/enamel PPL20 (RAL, NCS) 100 : C20 (C61) 50 : S50 30, 150 g/m², dry 4 h at 20–25 °C.

    The 2025–26 catalogue lists only PC60 (40–50 %) for PPL20; C20 is the old name of PC20.

  • S50Thinner
    % by weight: 10–30 %official

    Standard thinner for every PC20 system: white primers 10–30 %, clear primers 20–30 %, lacquers 25–30 %.

  • S70 / S80Thinner
    % by weight: 25–30 %official

    Slow thinners for PTL50 lacquers (S70 also for PTS52) — in hot weather and on large flat panels.

    S80 is slower than S50: more dust pick-up and sag risk; it does not change cure time.

Percentages are per 100 parts of component A.

Characteristics

Solids
28 ± 1 %dealer
Chemistry
aromatic isocyanate hardenerdealer
Reactivity
fairly high reactivity and drying speed; on the catalogue chart it sits on the fast/hard side, but slightly toward the elastic side of PC25 — dealer pages: PC20 instead of PC25 gives a more elastic film and slower dryingdealer
Density
≈ 1.0–1.05 g/mlrecommended
Pot life
3–4 hdealer
Drying · Touch-dry
20–40dealer
Drying · Full cure
4–8dealer
Drying · Conditions
20 °C
Drying · Sanding (h)
2–4dealer
Lightfastness
aromatic — yellows with light exposure; yellowing-resistance rank 3 of 10 (PC72 → PC10 → PC20 → PC90 → PC25 → PC60 → PC210 → AC200 → AC41 → AC40)catalog

Application

HVLP

Nozzle · Clear lacquers PTL20/PTL50
1.3–1.5
Nozzle · Clear primers PTS
1.5–1.8
Nozzle · White and black primers PPS
1.8–2
Pressure · air · Inlet pressure, min
2
Pressure · air · Inlet pressure, max
2.2
Pressure · air · at the cap, max
0.7
Why ru
PC20 встречается только в смеси. Прозрачные ПУ-лаки с ~43–46 % сухого остатка компонента A хорошо распыляются соплом 1,3–1,5 мм; прозрачным ПУ-грунтам (41–57 % сухого остатка, часто тиксотропным) для 150 г/м² нужно 1,5–1,8 мм; пигментированным грунтам PPS с 71–79 % сухого остатка — 1,8–2,0 мм (заметки владельца по PPS50277: на 1,5 мало). Давление на входе/головке — по практике владельца с HVLP для ATL50 и стандартным пределам HVLP (≤ 0,7 бар на головке).

The hardener is not sprayed on its own — nozzle and pressure follow the mixed base. Airmix/airless for the thixotropic PTS50/PTL50/PPS50 (turquoise icon in the catalogue): 0.009–0.013" tip (0.23–0.33 mm), 60–100 bar fluid, 1–2 bar atomising air.

Process and compatibility

Mixing
Weigh: base (part A) 100, then PC20 at the base's dose, stir, then thinner (% of part A). Let it stand 5–10 min and strain through 125–190 µm. Pot life 3–4 h at 20 °C — only mix what you'll spray in that time.recommended
Temperature and humidity
18–25 °C, RH no higher than 70 %; in humid air the isocyanate reacts with water — expect blushing and micro-bubbles.recommended
Don'ts
  • don't eyeball the dose: too little gives a soft film, too much gives brittleness and yellowing
  • don't use it under white or pale finishes where yellowing matters — use PC60
  • not for gloss lacquers/enamels (use AC200/PC210) or acrylic materials (AC40/AC41)
  • don't leave the can open — it picks up moisture from the air and goes cloudy or gels
  • don't add it to polyester materials (EPS/ETS use their own EC1/EA1)

Storage

Storage temperature
+5…+25 °C, tightly closed, dry placerecommended
Packaging
0.5 L,2.5 L,12.5 L,25 Ldealer

Safety: Contains isocyanates (including a volatile 'free' fraction) and organic solvents. Spray only in an extracted booth, wear an A2P2 carbon respirator (air-fed is better), nitrile gloves and goggles. Highly flammable — keep away from flames and sparks.

Used in finishing systems

Mixed into

C20040 / C20041 / C26 / C50 / PC10 / PC20042 / PC80 / PPL R**** M / PPL R1013 DM / PPL R8022 M / PPL R9001 M / PPL01 / PPL20 DM / PPL20 G / PPL20 M / PPL20 SM / PPL20 UM / PPS01 / PPS10 / PPS20 / PPS20040 / PPS40 / PPS40042 / PPS40043 / PPS40045 / PPS40091 / PPS50 / PPS50277 / PTL01 / PTL1 DM / PTL1 M / PTL1 UM / PTL10 G / PTL10 M / PTL10 SM / PTL10 UM / PTL20 DM / PTL20 M / PTL20 SM / PTL20 UM / PTL50 G / PTL50 M / PTL50 SG / PTL50 SM / PTL50 UM / PTL50090 / PTL80 M / PTS01 / PTS10 / PTS20 / PTS20700 / PTS21812 / PTS50 / PTS50 A / PTS52 / PTS60

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 product page
  • no Technocolor TDS/SDS PDF found (web search budget exhausted in this session)
  • viscosity of the hardener
  • NCO content
  • measured density
  • shelf life (unopened)
  • official storage temperature
  • flash point / hazard classification
  • price per pack not reliably attributable (dealer shows 695 ₽ at 347.50 ₽/L without naming the pack)
  • schedule step 4 pairs C20 with PPL20, which the 2025–26 catalogue lists only with PC60
  • PPS40 dealer page has no technical data; PPS40091 dealer page lists PC25 instead of PC20