He aha te paipa Astm a269?

He kaihanga mātou o ngā ngongo koiri maitai kore waikura astm a249, ko te paerewa ko te ngongo koiri ASTM A 249, ko te ngongo he Paerewa ASTM A249. He kanapa te mata, ko te roa he 4000m/Koiri, he ngohengohe te ngongo koiri, ka taea te whakamahi mō te mara hinu, te hononga paipa, ngā taputapu.