AC41
AC41 hardener for 2K acrylic coatings
Aliphatic (non-yellowing) isocyanate hardener for Technocolor 2K acrylic primers, matt lacquers and converters. Alternative to AC40 in ATL20 M and the ATL90 lacquers, and per the catalog also in ATS20, APS20 and ATL1. On the catalog scale it yellows a touch more than AC40 but clearly less than any of the PU hardeners.
- Part B for ATL90 acrylic lacquers (DM, UM, M, SM, SG, G) — 10–20 %
- Part B for ATL20 M — 10–20 % (shop: 20 %)
- Per catalog: ATS20 and APS20 acrylic primers — 20 %
- Per catalog: ATL1 enamel converter — 10–20 %
- Light and white finishes where non-yellowing matters
Ask about AC41
Answers are based on the AC41 data and the products it mixes with.
Characteristics
- Solids
- 38 ± 1 %dealer
- Hardener type
- aliphatic isocyanate hardener for acrylicscatalog
- Lightfastness
- 9th of 10 for non-yellowing: better than every PU hardener and AC200, a notch behind AC40catalog
- Speed vs elasticity
- right-hand side of the fast-hard → slow-elastic axis, just left of AC40catalog
- Moisture sensitivity
- isocyanate hardeners are sensitive to waterofficial
- Pot life
- 5–6 h for the catalysed host mix at 20 °C (ATL90 all variants, ATL20 M, ATS20: 6 h; APS20: 5 h)dealer
- Drying · Conditions
- 20 °C
- Drying · Touch-dry
- 20 min (host ATL90/ATL20)dealer
- Drying · Sand or stack
- 1 h to sanding (host ATL90 UM/M/SM/SG)dealer
- Drying · Full cure
- 6 h (ATL90), 8 h (ATL20 M)dealer
- Density
- ≈1.0–1.1 g/cm³recommended
Application
HVLP
- Nozzle
- unchanged — set by the host: 1.3–1.5 mm for ATL90/ATL20 lacquers (27–29 % solids, 40–45 s VZ-4), 1.5–1.7 mm for ATS20; 1.7–1.9 mm for APS20 (57–60 % solids)recommended
- Pressure · air
- per host; e.g. 2.0–2.2 bar inlet with trigger pulled, ≤0.7 bar at the cap for the thin clear acrylicsrecommended
- Spray viscosity
- catalysed + thinned host at ~18–22 s DIN4/VZ-4, 20 °Crecommended
Hardener into part A first, stir, then thinner. Let it sit 5–10 min, strain. Mix only what you'll spray inside the pot life (5–6 h); never pour leftovers back into the can.
Airmix (air-assisted airless)
- Nozzle
- per host: 0.23–0.28 mm (09–11 thou) tips for the clear acrylic lacquers, 0.28–0.33 mm (11–13 thou) for APS20; fluid 40–80 bar, atomising air 1–2 barrecommended
Process and compatibility
- Temperature and humidity
- Work at 18–25 °C and up to 70 % RH. Cold slows the cure; high humidity risks haze and micro-bubbles.recommended
- Don'ts
- Don't leave the can open — the hardener pulls moisture from the air and turns cloudy/thick
- Don't use hardener that's cloudy, gelled or has sediment
- Don't exceed 20 %
- Don't use it in PU products in place of the PC hardeners unless Technocolor lists it
- Don't blend AC41 and AC40 in one batch
Storage
- Packaging
- 2,5 лdealer
- Shelf life
- ≈12 months in the sealed original canrecommended
- Storage temperature
- +5…+30 °C, dry, tightly closed; reseal straight after use (nitrogen/dry-air blanket on part-used cans helps)recommended
Mixed into
AC40 / APS20 / ATL1 M / ATL1 UM / ATL10 SM / ATL20 M / ATL20 SG / ATL20 SM / ATL20 UM / ATL90 DM / ATL90 G / ATL90 M / ATL90 SG / ATL90 SM / ATL90 UM / ATL93 / ATS20
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 product page: description, solids 38 ± 1 %, 2.5 L pack, price
- second dealer: solids 38 ± 1 %, type acrylic, application text
- sister hardener AC40: same solids, 'non-yellowing, good elasticity'
- official ATL20 M: AC40/AC41 10–20 % wt and vol
- official ATL90 UM: AC41/AC40 10–20 %
- official ATL90 M: AC41/AC40 10–20 %
- official ATL90 SM: AC41/AC40 10–20 %
- official ATL90 SG: AC40/AC41 10–20 %
- dealer ATL20 M: AC40/AC41 20/20, host specs
- dealer ATL90 M: AC40/AC41 10–20, pot life 6 h, sand 1 h, full 6 h
- dealer ATL90 UM: AC40/AC41 20/20
- dealer ATL90 SM: AC40/AC41 20/20
Not covered by the sources
- No official t-color.ru page for AC41
- No Technocolor TDS/SDS PDF found (web search budget exhausted; dealer pages carry none)
- Density / specific gravity not published
- NCO content and hardener viscosity not published
- Solvent composition / flash point not published
- Shelf life and storage temperature not published
- Quantified difference vs AC40 (pot life, drying, hardness) not published — only the catalog chart's relative positions
- Catalog solids (≈36 %) disagrees with shop (38 ± 1 %)
- Whether AC41 is approved for ATL20 UM/SG, ATL50, APL1/APL20/APL RAL, ATL2 (sources list AC40 only)
- ATS20/APS20/ATL1 accept AC41 per catalog only; their official/dealer pages list AC40 only