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S70

S70 Slow thinner (for PU)

Slow-evaporating thinner for two-pack PU and acrylic finishes. Low evaporation rate, medium solvency. Made for dead-matt and high-gloss PU and acrylic lacquers and enamels: it keeps the film open longer so it flows out, levels better and gives less orange peel and dry overspray. On the official product pages of ATL500, PTL500, PPL200 and PPL500, and in the catalog for PTL202, S70 is the only thinner listed (the catalog also allows S80 for ATL500, PPL200 and PPL500).

  • Thinning 100-gloss PU and acrylic lacquers and enamels
  • Thinning dead-matt PU and acrylic finishes
  • Warm shops and large flat panels where you need a longer wet edge
  • Topcoats where flow-out and no dry overspray matter

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Answers are based on the S70 data and the products it mixes with.

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Characteristics

Evaporation rate
low (slow)catalog
Evaporation rate (official)
drying: slowofficial
Solvency
mediumcatalog
Position in range
S13/S30 fast → S31/S50 medium → S70/S80 slow (low evaporation) → S100 very slow (retarder); S90 is also low-evaporation but for stains onlyrecommended
Effect on cure
does not change the 2K cure chemistry; dust-free time and time-to-sand get a bit longer, especially on thick or cool coatsrecommended
Temperature effect
viscosity drops as temperature rises and is adjusted by adding thinner; measured with a flow cup (Ford type, 2/4/6/8 mm orifice) in secondsofficial

Application

HVLP

Nozzle
unchanged - pick the nozzle for the host lacquer/enamel (e.g. 1.3-1.5 mm thin clear acrylic/PU gloss, 1.7-2.0 mm high-solids primers and gloss enamels)recommended
Spray viscosity
thin the host product to its working viscosity, typically 18-22 s DIN4 / VZ-4 at 20 °C for HVLP/conventional, within the % the host datasheet allowsrecommended
Flash-off
allow ~25-50 % longer flash-off between wet-on-wet passes than with S50recommended

On vertical work lay thinner passes with S70, or blend with S50 where the host datasheet allows it: slow solvent raises sag risk. Longer open time also means more dust pickup outside a clean booth.

Conventional spray

Pressure · air
per host product, usually 2.5-3.5 bar at the gun for conventionalrecommended

As for HVLP: nozzle and pressure follow the host product; S70 helps against dry overspray at higher atomising pressure.

Airmix (air-assisted airless)

Nozzle
per host product (typically 09-11 thou / 0.23-0.28 mm tips for 2K lacquers)recommended
Pressure · fluid
per host product, typically 60-100 barrecommended

Tip and fluid pressure follow the host product; S70 extends flow-out on warm-shop line work.

Process and compatibility

Temperature and humidity
choose S70 above ~23-25 °C, on large flat panels and for gloss topcoats; at 15-20 °C or on vertical work use S50 (where allowed) or a S50/S70 blendrecommended
Don'ts
  • Do not exceed the thinning % given for the host product (cuts solids, hiding and film build)
  • Do not use S70 with polyester, nitro or waterborne products - Technocolor lists it for none of them
  • Do not lay heavy coats on verticals with S70 without a sag test
  • Do not thin the hardener on its own - add thinner to the A + hardener mix

Storage

Packaging
1 л,5 л,25 лdealer

Safety: Flammable organic-solvent blend. Use in a ventilated spray booth with an A2 organic-vapour respirator and nitrile gloves; keep tightly closed away from flames and sparks.

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
  • composition / solvent blend not published
  • numeric evaporation rate (vs butyl acetate = 1) not published
  • density, flash point not published
  • shelf life and storage temperature not published
  • no Technocolor TDS/SDS PDF located
  • what distinguishes S70 from S80 - catalog lists identical properties
  • catalog (by weight/volume unspecified) and official % disagree for ATL200, PTL200, PPL200, PPL500, PTL100; ATL500 catalog block 0-20 % vs official 20-30 % (possible transcript misalignment)
  • dealer page (t-colormarket.ru) has no 'Все технические характеристики' block for S70 - only properties, application and packaging; web search budget exhausted, so no TDS/SDS searched