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Polyurethane Foam
INHA University
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Polyurethane foam
Flexible Polyurethane Foam
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Cell count : Characterize different types of foams
Based on the size of the individual cells in the foam matrix
Expressed as either average cell diameter
Number of cells per linear distance.
Test method D3576
Cell count
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Core Density : specimen of regular shape without skin
(core : the internal portion of a molded part, free of skin)
2) Section Density : specimen with skins on the top and bottom surface.
cut from a portion free of voids and defects
Density to the nearest 0.1kg/m3 , and Type of specimen, core or section.
Density
Density : M/V ⅹ106
M = mass of specimen, g
V = volume of specimen, mm3
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IFD : Indentation force deflection test
Dimension of specimen : less than 380ⅹ380ⅹ100 …(생략)
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m
How Thick the padding under the average person.
Measure the thickness of the pad under a fixed force of 4.5, 110, 220N
IRGL
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2) Procedure
IRGL
Preflex the foam force before beginning taking measurements.
compress the foam with 330N (4mm/sec) and wait 6 min.
2. Contact the foam with a 4.5 N force and measure the thickness (0.83 mm/sec)
110N force → 220N force → record the thickness
The thickness at 4.5, 110,220N after 60s and length, width, and thickness of the specimen.
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Compression force deflection test
The force necessary to produce a 50% compression over the entire top area
Standard specimen : 50ⅹ50ⅹ25 mm
Minimum thickness : 20 mm
Compression Force
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2) Procedure
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