Solid State Science and Technology, Vol. 20, No 1 & 2 (2012) 142-147
DYNAMIC PROPERTIES OF NEW PROCESS NATURAL RUBBER BY
DYNAMIC MECHANICAL THERMAL ANALYSIS AND GABO
Rohaidah Abd. Rahim*, Ahmad Khairul Muhamad and Mohd Ismail Rifdi Rizuan
Malaysian Rubber Board, Technology Centre, RRIM Research Station,
Sg. Buloh, 47000 Selangor, Malaysia
*Corresponding author: email@example.com
Malaysian Rubber Board has developed a new grade of rubber using a new process and
technique for production of field coagulum grades. Research showed that the new
process natural rubber (NPR) has low gel content, better processability, low modulus
and similar recovery behaviour and physical properties compared to commercial
Standard Malaysian Rubber (SMR). Further research is carried out to determine the
dynamic properties of NPR by Dynamic Mechanical Thermal Analysis (DMTA) and
Gabo flexometer. The DMTA measures the tan delta values of material when exposed
to temperatures from -70°C to 80°C at constant deformation. The Gabo flexometer
machine can be used to determine heat build-up and viscoelastic properties of rubber
undergoing rapid cyclic deformations at certain frequency or over a range of
frequencies. The cyclic deformation behavior of rubber is important in products such as
an indication of tyre performance, bearing, v-belts, and cable pulley insert rings etc.
which are subjected to dynamic flexing in service. The dynamic properties of NPR are
compared with commercial grades SMR 10 and SMR CV 60. DMTA results show that
the vulcanizates give almost similar curves and values at both 0°C and 60°C indicating
little differences in the compound’s wet grip and rolling resistance properties for the
three grades of rubber. The Gabo flexometer machine determined heat build-up and
viscoelastic properties of rubber. The results indicate that the NPR generates the lowest
heat build-up value and low tan delta as compared to SMR 10 and SMR CV60. As a
general conclusion, NPR could be advantages as an alternative material for tyre
Keywords: DMTA; Gabo flexometer; heat build-up; viscoelastic properties; tan delta
En Shahril Idzulsyahril (DMTA and heat build-up test).
 M. Ahmad Khairul, K. Nur Hidayaty and M.N. Zairossani, Process
Improvement of DPNR Production: Exploratory Experiment of New DPNR
Enzymatic Process (2007)UPPC Internal Report No.71.
 ASTM D623-07.Standard Test Methods for Rubber Property – Heat generation
and flexing fatigue in compression.
 ISO 4666/3. Rubber vulcanised- Determination of temperature rise and
resistance to fatigue in flexometer testing. Part 3; Compression flexometer.