OK, I understand the target is CPR class B2ca which is like the B1 in GB/T31247.The cable construction is rather complicated and therefore it is difficult to foresee what can happen during the flame test.Also, it depends by the sheath and all the other components. For example, I believe the glass fiber tape and the copper shield are protecting the underneath materials.In any case, we have beddings which are used in cables with CPR class B2ca, those beddings are