Describes a low-pressure apparatus for treatment of paintings. In this apparatus it is possible to work at a low atmospheric pressure, the normal field of activity being about 500-1200 mm Wc (Water column), maximum about 1500 mm Wc. The work is done solely at temperatures below 45° C, and flattening, impregnation, and lining can be carried out as separate treatments or in succession. Aqueous adhesives were used formerly for impregnation and lining; now these have more or less given way to synthetic adhesives (acrylic resin). Special importance has been attached to the possibilities of individual treatment in the development of the apparatus. Thus the treatment can be adjusted to the individual painting by exchanging sheets, supports, etc. and various heating systems. See also AATA 14-270.