可挤压的支架和加强杠有时会被聚丙烯泡沫或者成型的塑性塑料替代。
Polypropylene foam or formed thermoplastic sometimes is used in addition to or instead of crushable brackets and a bar.
滤芯最内层为聚丙烯骨架，用以加强滤芯的耐压强度。
The inner layer of the filter cartridge is polypropylene frame that can improve the filter cartridge's Pressure-resistant strength.
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