Table 2 Climatic parameters for natural and artificial ageing in the climate chamber: summary of the relative humidity percentage (RH%) and temperature (T) values used in the climatic chamber during the artificial ageing process.

From: Early degradation mechanisms at the interface between acrylic grounds and oil paint films

TYPE OF AGEING

ABBREVIATION

TEMPERATURE PARAMETERS

RELATIVE HUMIDITY PARAMETERS

Natural ageing

NAT

T = 23 °C

RH% = 47%

Artificial ageing-temperature variation only

T

Cycles T = 50–26 °C

RH% stabile = 55%

Artificial ageing-only moisture fluctuations

RH%

T fixed = 26 °C

Cycles RH% = 90–40%

  1. NAT: ageing under room temperature conditions; T: artificial ageing with temperature cycles and stable relative humidity parameters; RH%: artificial ageing with relative humidity cycles and stable temperature parameters
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