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Nov 14, 2018 To test our fillers we made three 5 ” x 5 ” test pads from scrap cotton fabric and filled each with 1 cups of the various fillers. We chose to compare them by volume rather than weight because that’s the limitation on your sewn warming pad. Heat retention. Using a 1.65 kilowatt microwave, we heated each of the pads for thirty seconds.Get Price