The filler materials must be correctly proportioned to provide a homogenous mass in such a manner as to completely fill the shell within the maximum clearances specified by DOT to resist cracking of filler during rough handling of the cylinder.

• 填充材料必须比例正确，形成均匀同质物，在DOT规定的最大空间内完全填满瓶体，以防止在粗暴操作钢瓶过程中填充物的破裂。