Keterangan :

Indonesia Natural Rubber Product and exporter of Standard Indonesia Rubber, located in the centre plant of Natural Rubber Plantation in Sumatera Indonesia
atex concentrate is graded according to detailed technical specifications ( as for block rubber) . Technical specifications are separately established by both the American Society for Testing Materials ( ASTM) and the British Standards Institution ( BSI) . National and international standards are substantially identical in their requirements. Commercial latex is nowadays mainly prepared by centrifugation, with only two types made on a large scale:

1. HA ( high-ammonia) latex, preserved with 0.7% ammonia
2. LA-TZ ( low ammonia) latex, preserved with 0.2% ammonia + 0.025% TMTD/ ZnO + 0.04 - 0.05% lauric acid as ammonium laurate.