Aerogel composite

An aerogel composite comprising:

• a fiber substrate including a plurality of discrete fibers and voids between the fibers;
• and
• silica aerogel including a plurality of aerogel particles positioned on the fibers or in the voids between the fibers, and having a network structure including one or more pores,
• wherein:
• a weight retention rate measured after heating the aerogel composite at a temperature of 350° C. for 60 minutes is 96% or greater, and
• a weight retention rate measured after heating the aerogel composite at a temperature of 350° C. for each of 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, er and 30 minutes satisfies Equation 2 below:
• A (%)={(Weight retention rate measured after heating for x minutes (a))−(Average value of weight retention rates after heating (b))}/(Average value of weight retention rates after heating (b))×100 [Equation 2]
• wherein in the Equation 2 above:
• the x minutes is 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, or 30 minutes;
• the weight retention rate measured after heating for the x minutes (a) is a percentage (%) of a weight of the aerogel composite measured after heating the aerogel composite at a temperature of 350° C. for the x minutes with respect to a weight of the aerogel composite at 350° C. before the heating;
• an average value (b) of weight retention rates after the heating is an average value of weight retention rates obtained after heating the aerogel composite at a temperature of 350° C. for each of 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, and 30 minutes;
• and
• A is a real number of −1.0 to +1.0
• wherein a volume ratio of the fibers per unit volume of the aerogel composite is 2% to 12% and a volume ratio of the aerogel including pores and the voids between the discrete fibers per unit volume of the aerogel composite is 88% to 98%.