Mark under which the bottle is the code issued by The Society of Plastic Industry in 1998 in the United States and followed by development institutions code system, such as ISO (International Organization for Standardization). Tanda di bawah botol itu merupakan kode yg dikeluarkan The Society of Plastic Industry pada tahun 1998 di Amerika Serikat dan diikuti oleh lembaga-lembaga pengembangan sistem kode, seperti ISO (International Organization for Standardization).
