An acrylic foam is sprayed to one side of light- to medium-weight cotton or cotton blend fabric to produce foam-backed lining. The resulting lining is usually not dry-cleanable, can be difficult to sew and has a tendency to become brittle after prolonged sun exposure. It is a lower cost option that offers medium insulation and does not black out all light.
Two or three layers of acrylic or latex are sprayed onto one side of a medium-weight cotton or cotton blend fabric to produce blackout lining. Advances in technology have produced a very soft suede-like finished fabric that drapes well and is washable. No light will pass through this lining, so it has the advantage of being blackout as well as highly insulating.
The back of a woven cotton fabric is combed to create a flannel backing. Usually 100 percent cotton fabric is used; therefore, shrinkage may be a problem, but the resulting lining is soft, drapes well and has a medium insulating value. Light will pass through this lining.
To create very energy-conserving window coverings, linings are applied in layers. Blackout lining placed between flannel-backed lining and the decorator fabric creates a highly insulating drapery that also provides total blackout.