Due to the influence of the rubber tree strain

planting climate and soil

field management

processing technology and so on

there were large differences in the quality of concentrated natural rubber latex between native and imported. The brand of Baodao and Meilian from Hainan

Guangken-1 from Maoming

Guangken-2 from Yangjiang

Huangchunfa and Sankeshu from Thailand were obtained.And the comparison about the quality of these latex were studied

including molecular weight and its distribution

particle size distribution

the kind and content of fatty acids

the concentration of metal ions

zeta potential

the mechanical stability and the content of fatty acids.The results showed that the average molecular weight of native latex was relatively small and showed wide molecular weight distribution. The average particle size of imported latex was larger and it’s particle size distribution was narrow. The contents of unsaturated and saturated fatty acids of imported latex were higher than native latex. Huangchunfa

comparing to the others

the contents of Ca

2+

Mg

2+

and Zn

2+

were the lowest and it got the best colloidal stability. The mechanical stability of imported latex was higher during storage

and the volatile fatty acid was lower.