1. Freight amount when the thermos is in good condition: (500 * 6)/10 * 5.5 =1650 yuan.

2. The amount of compensation for the loss of thermos bottles by the transportation team: 1650- 1553.6=96.4 yuan.

3. The cost of breaking a thermos bottle:11.5+5.5/10 =12.05.

4. Quantity of insulation products: 96.4/ 12.05=8.