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Old 01-09-2011, 02:34 AM
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another foam question

I have read the sticky titled "bench seat from scratch". Great read, but I am having trouble understanding the foam selection. If I am reading it correct the 1st two numbers relate to quality, and the second two realate to density.
When I shop online, it almost appears the other way around....judging by the price and item description? What about HD versus HR? I know the thread is over a year old, is there a newer method for grading the stuff? Thank You, JCAR

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Old 01-09-2011, 06:29 AM
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No, the method for grading has not changed, but this subject can be awfully confusing. I simplified it when I posted that thread. The first two numbers are actually density numbers, which refers to the foam's quality, and the second two are ILD which is indent load deflection (or IFD which is indent force deflection, both of which mean the same thing), which is the ability of the foam to recover it's shape. HD is high density, and HR is high resiliency. So that means that HD foam is higher quality and HR foam returns to shape quicker. Unfortunately, some places use those two terms to mean the same thing, and they are not. There are a number of other designations, like FR which is fire retardant, CV which is conventional foam. You still need to know the ILD to know how soft or firm the foam is. If you can't figure it out, call the supplier.

I have seen some suppliers that only refer to the last two numbers, but most places use the 4 digit system. Some places do reverse the order, but that is their way of referring to their own products. They generally tell you that the foam is soft or firm.

There can be 5 digits to a number, but that would refer to an ILD of 100 or more. In other words, there can be a 26100 foam which would be medium high quality (density) and 100 ILD. The way you can tell if the numbers are reversed is if the first two numbers are over 34. As far as I know, there is no higher quality (density) number than 34.
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Old 01-09-2011, 02:56 PM
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Thank You, I looked it all over several times and had pretty much came to the same conclusion, but I felt it was better to ask. I am forced to order most of my supplies on-line, or the closest supply house is 60 miles. I am still building a relationship with the supply house, so I want to "know" what I am asking for and recieving while we build our trust. Thank You again, JCAR
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Old 01-09-2011, 10:16 PM
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Quote:
Originally Posted by JCAR
Thank You, I looked it all over several times and had pretty much came to the same conclusion, but I felt it was better to ask. I am forced to order most of my supplies on-line, or the closest supply house is 60 miles. I am still building a relationship with the supply house, so I want to "know" what I am asking for and recieving while we build our trust. Thank You again, JCAR
I'm in NYC and I'm in the same boat. I went to the one and only local guy and he looked at me as if I were crazy when I asked about the numbers. All he knew was "soft", "Firm" and "extra firm". I walked out. And not because of his lack of knowledge. But because if his superior foreign attitude. He deserved to be put in a meat grinder and turned into chum for the fishing boats out in Sheepshead Bay. I found what I was looking for online and now stick to that way of doing things.
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Old 01-10-2011, 07:38 AM
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I am fortunate to have one supplier who has everything there is to have as far as foam, over 60 different kinds. They will cut any thickness, any width, and almost any length for me, in any of the different kinds of foam they carry. The best part is I can order it at 2:00 p.m. on one day and have it at 9:00 a.m. the next day.

Here are some more prefixes that you may encounter: BF is bonded foam (like carpet padding), CM is combustion modified (to meet FAA standards for use in airplanes), DF is dry fast, FL is flotation foam, HC is high comfort, NP is neoprene, PC is pin core (which is latex foam, not polyurethane), VE is visco elastic (memory foam), and VL is Volara, or closed cell foam.

All of this is only the tip of the iceberg, there are thousands of other types of polyurethane foams, and combinations of polyurethane and other substances.
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Last edited by DanTwoLakes; 01-10-2011 at 08:04 AM.
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