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Q: Could this foam be used for replacement couch cushions?

I used it to replace the seat cushions on a couch. Worked great. In terms of back cushions, it depends on the couch. Just make sure it isn't too thick. The rest may be tmi, but it may help. The foam should be one inch bigger than the measurement from edge seam to edge seam. For example my couch cushions were 22in long by 23in wide by 5in deep so I cut the foam inton23in long by 24in wide by 6in deep squares.

Q: Would not the 5 inch thick foam need to be more dense than the 3 inch foam, to be able to have the same compression rate?

No, density is the life span of the foam while compression rating/ILD is the firmness or softness. When a foam has a density level its per cubic foot so a 3 inch and 5 inch can have the same density level and have the same firmness level

Q: I need 4 pieces but height need to be 12” not 6” would be Able to make them?

Dear Buyer. We are able to cut 12 inch foams but not in the 72 inch length. These units are compressed in a box and compressing a 12 inch foam with that length will ruin the compression rating making it soft. You can always glue 2 pieces together with upholstery glue which will make it almost impossible to seperate

Q: What type of glue can I use with it?

Dear Buyer, You can use 3m adhesive glue spray to glue 2 pieces together. If you would like a 1 piece unit please message us and we can direct you to our listing. Thank You