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August 4, 2026 By Bill Lazzio

What VOCs actually mean, and why European finishes beat American ones

Every timber coating you can buy in Australia has a VOC number printed somewhere on the label. Most buyers glance at it, assume lower is better, and move on. The real story is more useful than that, and the ATFA Code of Practice for Coating of Timber Floors now explicitly addresses VOC compliance in its specification sections for residential and commercial work.

VOC stands for volatile organic compound. It is a catch-all for any carbon-based solvent that evaporates at room temperature: turpentine, xylene, toluene, mineral spirits, and a family of "coalescent" solvents used in water-based products. The volume of these solvents released per litre of coating is reported as grams per litre (g/L).

Why VOCs matter

  • Health. Short-term: headaches, dizziness, respiratory irritation. Long-term: documented links to liver, kidney and CNS damage. Benzene and formaldehyde are carcinogens.
  • Environmental. VOCs react with nitrogen oxides in sunlight to form tropospheric ozone (smog).
  • Indoor air. After you apply a coating, VOCs continue outgassing from the film for weeks or months. This is why freshly finished floors still smell six weeks later.

The regulatory split: EU vs US vs Australia

Europe, the US and Australia all write different rules for what counts as a VOC and how the number is calculated. The difference is big enough that the same can of finish could read 150 g/L in the US and 90 g/L in Europe.

Europe (2004/42/EC Directive):

  • Ready-to-use product measurement (includes hardener for 2K)
  • Includes all volatile organics including "exempt" compounds in the US
  • Caps: 140 g/L for interior water-based, 400 g/L for interior solvent-based (dropped from earlier 500 g/L limit)
  • The European cap is the real cap. Nothing is "exempt"

United States (EPA + state-by-state, California SCAQMD toughest):

  • Measurement excludes "exempt" solvents like acetone, PCBTF, methyl acetate
  • Manufacturer can swap toxic VOCs for exempt ones and claim a lower number
  • Caps vary state by state, California at 275 g/L

Australia (GBCA Green Star + voluntary):

  • No mandatory cap, voluntary schemes like Good Environmental Choice and Green Star reference European thresholds
  • Importers can rely on the source-country declaration

Why this matters on your floor

A tin of US-made polyurethane that claims "low VOC 120 g/L" might genuinely contain 200 g/L of actual volatile organics once you count the exempt solvents. A tin of European water-based polyurethane claiming "VOC 85 g/L" almost always measures at 85 g/L in total.

The label on the tin in Australia may not flag this. The EcoGrit rule of thumb: if a finish was formulated in Germany, Denmark or Belgium, the VOC number on the tin is the real number. If it was formulated in the US, add 30 to 50 percent for a true comparison.

European benchmarks worth knowing

These are the current VOC numbers on EcoGrit-stocked products, measured under EU method:

Compare to typical US oil-based polyurethane: 450-550 g/L.

Low-VOC does not mean "no care needed"

Even zero-VOC products outgas trace compounds for 48 to 72 hours. Ventilate during application. Ventilate during cure. Run fans across the floor, not windows open on a still day.

People with chemical sensitivity should still wait 5-7 days before re-occupying. Babies and pets, 7-10 days.

The honest trade-off

There is no free lunch. Lower VOC usually means:

  • Shorter open time (the coating skins faster, harder to lay off long floors)
  • Finicky to temperature and humidity
  • More expensive per litre (premium resins, no cheap solvents)

But the floor is your air. We think the trade-off is worth it.

Our preference, honestly

For any residential or small-commercial job, we would specify a European water-based 2K or a penetrating hard wax oil, every time. The VOC difference alone is worth the 15-25 percent premium over US solvent-based polyurethane.

For trade questions or spec help aligned to ATFA, AS/NZS 4858 and EU 2004/42/EC criteria: +61 401 270 818 or sales@ecogrit.com.au.

Timber Flooring Specialist

Bill Lazzio is a timber flooring specialist with over 30 years of hands-on experience in floor sanding, coating, and restoration across residential and commercial projects in Australia. Bill works with EcoGrit and leading European manufacturers to bring professional-grade, low-VOC products tailored to Australian conditions.

Filed in: diy, european-brands, technical, trade-pro, voc, water-based
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