Since the average proportion of various plastics is only 15-20% of ordinary steel, it is also lighter than ordinary wood.
ຍ້ອນວ່າອັດຕາສ່ວນສະເລ່ຍຂອງພລາສຕິກຊະນິດຕ່າງໆພຽງແຕ່ 15-20% ຂອງເຫຼັກ ທໍາ ມະດາທົ່ວໄປ, ມັນຍັງເບົາກວ່າໄມ້ ທໍາ ມະດາ.