Flame resistant filler cloth and mattresses incorporating same

A nonwoven fabric, comprising:

• a fibrous layer of cellulosic material comprising fibers that are bonded together by stitchbonding with a thermoplastic yarn that has a thermal shrinkage of less than about 20% when heated to 475° F. in accordance with the PFG test,
• wherein the fibers comprise viscose fibers,
• wherein the thermal shrinkage of the fabric at 400° F. is less than about 35% in any direction,
• wherein the fibrous layer of cellulosic material is coated with a flame retardant chemistry such that the fabric maintains flame and heat resistant integrity when impinged with a gas flame in accordance with testing protocols set forth in Technical Bulletin 603 of the State of California Department of Consumer Affairs (TB-603), and
• wherein the flame retardant chemistry comprises one or more compounds selected from the group consisting of boron compounds, phosphorous compounds, nitrogen compounds, antimony compounds and halogen compounds.