Filling power
The filling power or fluffiness (engl .: Fill Power) is a quality characteristic of the down and describes their capacity to store air.
This value is in "cuin" (cubic inches = cubic inches reported) and designated to which volume ( loft ) an ounce (~ 28 grams) down after compression expands. The fill power describes the ability of the down to regain its original volume after being compressed.
effect
The higher the filling power, the more air a certain weight of the down can trap and the more insulating the down has. The filling power ranges from approx. 300 in³ / oz (or 175 cm³ / g, or Lorch 75 mm / 30 g for feathers to approx. 900 in³ / oz (or 520 cm³ / g, or Lorch 225 mm) / 30 g) for the highest quality down.
The filling power ensures that the air chambers that are important for thermal insulation are repeatedly formed within the down. Its elasticity and dimensional stability mean that down is not damaged even under heavy loads.
A down filling with high filling power is lighter and more compressible than an equally warm one with a lower quality down.
Fill power, insulation capacity and weight
Depending on the intended use, a different filling power is required. The higher the fill power, the more insulation it has with a certain down weight.
The warmth of a duvet does not only depend on the filling power, but also on the filling quantity. A duvet with a fill power of 700 is much lighter than one with 550, as less down is required for the same warmth. Down provides warmth by trapping a layer of air that separates the cold side from the warm side. A thicker layer of trapped air provides more insulation . This thickness is often referred to as "loft". For example, a duvet that has a down filling with a fill power of 550 would have to use around 40% to 50% more down weight than a duvet with a down filling of 800 in order to develop the same insulation capacity.
Web links
Individual evidence
- ^ International Down and Feathers Laboratory: About IDFL - IDFL. Retrieved May 18, 2020 .
- ^ Association of Swiss Bedding Manufacturers: Technical Information | Association of Swiss Bedding Manufacturers (VSB). Retrieved May 18, 2020 .
- ↑ Why is down particularly good at insulating? - textination. Retrieved May 17, 2020 .