Foam Cushions
Submitted by Stephen Winters on Sun, 09/16/2012 - 17:14
Foam Quality & Density
Foam Come in a variety of qualities and densities. By quality, we are generally referring to the density. Density means, how dense is the foam = How much foam material is contained in a given amount of space. For practical purposes, the density of foam is measured by weight. For example, a low quality foam might weigh approximately one pound a specific size, while a high quality foam for upholstery might weight about 2 1/2 to 3 pounds for the same size.
In our shop we don't stock polyfoam, but we do have some foam samples in the various qualities and softnesses. On the sides of the samples, as shown the picture, the grade numbers are marked. The grade number consists of two specifications. the first two digits denote the density. The second two numbers denote firmness. For example, a specific size of the 2535 foam will weigh 2.5 pounds and will have a compression ratio of 35 pounds. (It takes 35 pounds to compress that foam a specific amount.)
A question was asked recently, on another board, about how to create a crown (or crest) on a flat foam cushion. There are probably many ways to do this, here is one way.
Now, about getting a "crown" on the cushions.
Now, about getting a "crown" on the cushions.
Making a little bit of a crown:

When this is stuffed into the cushion, it will give a rounded effect. (which I use for most of my jobs.)
Getting more of a Crown:


Then, as papasage said (on that other board), you can cut the cushion side boxing narrower. For instance, if you are using 5 inch foam, you can also cut the boxing about 5 " wide also. After it is sewn, the boxing will be 4" wide (It will cause the top and bottom of the cushion to come down over the side a little, which, when combined with the dacron wrap, will increase the "appearance" of a higher crown.)
I hope that helps.
Best Wishes,
Stephen
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