Клієнт заплутати м'якість щільність і піна піна весь час. Пишуть електронною поштою мені, "Я шукаю піни низької щільності". Я завжди прошу "ви дійсно розумієте щільності або ви маєте на увазі м'якість?" Вони (майже завжди) означає м'якість.
So, what is the difference? Щільність піни є вимірювання увага of a cubic volume of a material, like 12lbs/ft3. On the other hand, the softness of foam is a measurement of the tension on the surface of the material when it is touched.
Actually, there is not a real direct relationship between foam density and foam softness. You can have foam that is 2lb/ft3 density and is very soft or very hard. It depends on the chemicals used to make the foam.
How, then, is softness measured? It’s measured with an instrument called a durometer. There are three major softness measurement scales: Shore 00 (shown right), Shore A, and Asker C. Shore 00 is the best scale to use when you want to measure something that is very soft as it has the widest scale on the soft end.
So, is there any relationship between softness and density? Not really. However, there is a direct relationship between density and Squishiness (a new term I have created.) Of course, I’ve had to also create the tool for measuring this soft foam specification…the Squishometer (seen below left.)
Take the difference between open cell foam and closed cell foam. Відкрити клітинку піни оцінки надзвичайно висока на в Squishometer because it has a very low density. (A sponge is an example of open cell foam.) Closed cell foam tends to be denser and, therefore, scores low on the Squishometer.
Hopefully my short post on this (often confused) physical property of soft foam is now clear. The next customer who asks me will be the test of this theory.