What Is Ild in Mattresses?
An ILD (Indentation Load Deflection) rating refers to the hardness or softness of the visco elastic foam in a memory foam mattress or mattress pad. More specifically, the ILD is the pressure reading that results from pressing a foam block (15-inch square by 4 inches in height) down 1 inch or 25 percent. A lower ILD rating indicates a softer mattress. Does this Spark an idea?
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ILD Ratings
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ILD ratings are usually expressed in ranges between 10 to 16:
10 to 12 (soft)
13 to 15 (medium)
16 and above (firm)
Understanding the Rating
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For the 10 to 12 range, the ILD reading indicates that it takes 10 to 12 lbs. to indent the foam by 25 percent. A higher ILD rating does not signify a better mattress; it only says the mattress is firmer.
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How to Use the ILD Rating
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Use it as a guide. If you know you prefer a medium mattress, start looking at mattresses with ILD ratings of 13 to 15, but don't limit yourself to these ratings. Mattress ratings and compositions vary.
ILD and Density
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An ILD rating does not reflect mattress density. The density of a mattress relates to foam composition and determines how quickly the foam recovers or springs back into shape.
Summary
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When choosing a mattress, remember that the ILD rating is only one consideration. You will want to take density, price and comfort into account as well.
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