Open Coil Bonnell Springs
An open coil spring system is made by inter- twining coils of high tensile stell which are linked together by a tighter coil of steel running either horizontally or vertically. The ‘spring unit’ is then often surrounded by a steel rod to hold the diameter firm.
The term ‘gauge’ refers to the diameter of the spring and how tightly it is coiled. the tighter the coil, the firmer the feel of the mattress.
15 gauge is quite soft with 12.5 gauge being fairly firm in feel. This frame is then placed within the base of the mattress frame and secured with stitching. the frame is filled with a variety of fillings which will differ according to the manufacturer and the quality of the mattress. these fillings range from natural fibres such as pure wool and lambswool, mohair, silk, cashmere and even late, to manmade fibres such as reflex foam and memory foam and super soft white fibres.
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