Light and sun: lightfastness, lining and blackout
Why fabrics fade in the sun and how to protect curtains and upholstery by the window.
Sunlight, especially its UV component, breaks down dyes and fibres over time. Fabrics at south- and west-facing windows, in conservatories and in attic rooms are most affected. How well a fabric copes with this is described by its lightfastness.
Lightfastness
Lightfastness is rated according to ISO 105-B02 on a scale from 1 (very low) to 8 (excellent). The following guide values apply:
| Lightfastness | Use |
|---|---|
| 1 to 3 | cushions and decoration away from the window |
| 4 | lined curtains, upholstery out of direct sun |
| 5 and above | curtains and upholstery in sunny rooms |
| 7 to 8 | outdoor, conservatory, windows in full southern sun |
If the manufacturer states the lightfastness, you will find it in the product details. If it is missing, we will be happy to advise you.
Which fabrics are sensitive?
- Silk is particularly sensitive to light and should always be lined.
- Linen and cotton fade over time, especially in strong colours.
- Polyester and acrylic are usually much more lightfast. Acrylic performs best (polyacrylic, also known under the brand name “Dralon”).
- Strong and dark shades change more visibly than light, natural colours.
Lining protects
A lining on the back of the curtain protects the face fabric from direct sun and significantly extends its life. The curtain also hangs more beautifully. There are three common types:
- Standard lining: protects the face fabric but lets light through.
- Blackout lining: blocks the light almost completely, ideal for bedrooms.
- Thermal lining: also insulates against cold and heat at the window.
You can include lining in your enquiry to our sewing service: Request for quotation: Curtains and drapes.
Further tips
- Draw the curtains or close the blinds when you are away for longer periods.
- A sheer curtain or an inbetween in front of the window filters part of the light.
- Move upholstered furniture out of the direct midday sun or use throws.
- Even fading is less noticeable than individual light stripes. Rotate cushions from time to time.