Thermal insulation materials

A flexible thermal insulation fabric comprising a double-faced weft knitted structure formed by knitting yarn which comprises strands of air-textured glass fibre to produce two spaced knitted faces interlinked by yarn which passes from one knitted face to the other, the yarn comprising tuck stitches which pass from one face to the other face.

A flexible thermal insulation fabric comprising a double-faced weft knitted structure formed by knitting yarn which comprises strands of air-textured glass fibre to produce two spaced knitted faces interlinked by yarn which passes from one knitted face to the other, wherein at least some of the glass-fibre is converted to silica.

A flexible thermal insulation fabric comprising a double-faced weft knitted structure formed by knitting yarn which comprises strands of air-textured glass fibre to produce two spaced knitted faces interlinked by yarn which passes from one knitted face to the other, and wherein at least one of the faces of the fabric is coated with a refractory material.

A method of making a flexible thermal insulation fabric comprising the steps of weft knitting a double faced glass fibre fabric using yarn which comprises strands of air-textured glass fibre on a double needle bed weft knitting machine and interconnecting the faces of the fabric with at least one linking yarn which passes from one spaced knitted face to the other.

A method of making a flexible thermal insulation fabric comprising the steps of weft knitting a double faced glass fibre fabric using yarn which comprises strands of air-textured glass fibre on a double needle bed weft knitting machine and interconnecting the faces of the fabric with at least one linking yarn which passes from one spaced knitted face to the other, wherein the or each linking yarn is formed by tuck stitches which pass from one face of the fabric to the other.

A method of making a flexible thermal insulation fabric comprising the steps of weft knitting a double faced glass fibre fabric using yarn which comprises strands of air-textured glass fibre on a double needle bed weft knitting machine and interconnecting the faces of the fabric with at least one linking yarn which passes from one spaced knitted face to the other, wherein the glass fibre fabric is leached by contacting the fabric with hydrochloric acid to convert at least some of the glass fibre to silica.

A method of making a flexible thermal insulation fabric comprising the steps of weft knitting a double faced glass fibre fabric using yarn which comprises strands of air-textured glass fibre on a double needle bed weft knitting machine and interconnecting the faces of the fabric with at least one linking yarn which passes from one spaced knitted face to the other, wherein a first face of the fabric is knitted on needles of one bed which are of larger gauge than the needles of the other bed, using a yarn which is thicker than the yarn used for knitting the second face.