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Table 7 Acid values for rubber seeds, RSO and RSOEE

From: The influence of storage time on relevant product properties of rubber seeds, rubber seed oil and rubber seed oil ethyl esters

Material Acid value (mg KOH/g) Relative increase
Initial Final (%)
Rubber seed
 NPTa 0.8 4.2 425
 PTa 0.5 2.1 320
 Entry 1 (Table 1)b 2 8.6 330
 Entry 2 (Table 1)b 2 30.8 1440
Oil
 RSOa 0.52 0.6 15
 RSOb 18.1 31 71
Biodiesel
 RSO ethyl estera 0.32 0.33 3
 Rapeseed methyl esterc 0.15 0.22 47
  1. aThis study, after 2 months storage
  2. bZhu et al. after 2 months storage [15]
  3. cLeung et al. after 12 months storage [16]