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The glass transition temperature is a well-established indicator of tyre performance, yet it is one of the major mysteries of material science. In this article, Nynas researcher Martina Levin outlines how the unravelling of this elusive parameter can assist the development of new optimized extender oils.
For over fifty years the rubber and tyre industry has used mineral oils as extender oils. Extender oils decrease rubber viscosity and thereby facilitate its processing. However, the composition of the extender oil also has a significant impact on the properties of the final rubber components or products, such as tyres.
In the tyre industry, aromatic extracts have traditionally played a dominant role as extender oils. However, concerns regarding their toxicity and forthcoming European legislation have spurred an active search for suitable alternatives. Naphthenic oil is one of the major candidates put forward.
Whilst replacing the aromatic extracts it is vital that the tyre's performance is maintained - ensuring, for instance, high wet grip, low rolling resistance and low heat build-up. The glass transition temperature (Tg) is an established parameter that is often used as an indicator of tyre performance. It is used within the polymer industry to characterize structural relaxation properties, but it has also been widely adopted in the lubrication industry as a measurement for viscosity pressure properties and lubricant solidification pressure.
However, Tg is an elusive parameter, often described as the temperature at which the material changes from a liquid (or rubbery) state to a solid, glassy state. A glass is a material having the same disordered structure as a liquid but the rigidity of a solid. Rubbers, like styrene butadiene rubber, are used above their glass transition temperature, whereas hard plastics, like polystyrene, are used below their glass transition temperatures.
Since many properties (for instance viscosity, specific heat and elastic constants) change dramatically at Tg this can also be defined as the temperature at which the viscosity takes on a given value.
In order for glass transition to occur, the material needs to be in an amorphous state, either naturally or by supercooling in order to quench crystal formation. It should be emphasized that glass transition is different from melting. Melting only occurs in crystalline materials and the melting point is the temperature at which the material changes state from a solid ordered structure to a less ordered liquid.
The underlying theoretical explanation of Tg has not yet been fully clarified. There are three main theories - one focusing on so called free volume, another on thermodynamics and the third claiming it is all down to kinetics. Of late, new theories have emerged, for instance one based on sophisticated statistics and one using an energy landscape model. However, none of these theories is entirely successful in explaining the macroscopic phenomena occurring at Tg. Hence, glass transition is not as trivial as it may seem. To quote one of the subject area's greats, Salvatore Torquato, Professor of Chemistry at Princeton University: "The underlying physics of glass transition remains one of the most fascinating open questions in material science and condensed-matter physics."
Tg is an ill-defined quantity as it is method and rate dependent. Higher heating/cooling rates or higher frequencies give a higher Tg. Therefore, it is of utmost importance when defining Tg to also define the method used.
It is also a well-documented fact that molecular structure has a major impact on Tg. Whilst flexible groups (like ether links) will enhance flexibility and reduce Tg, inflexible groups (like benzene) will increase it. In the same way double bonds, chain-ends and ring-formations will influence Tg. Having said this, it may be easy to rationalize about Tg, but it is much harder to predict actual values.
Although molecular structure plays a major role, very few studies have been published concerning the effect of chemical composition on glass transition. This despite the fact that mineral oils are used very extensively as extender oils in the rubber and tyre industry.
To remedy this we have conducted a preliminary study addressing the issue of how different molecular groups present in naphthenic oil affect the oil's Tg.
Three highly refined, hydro-treated naphthenic oils with low aromatic content and of different viscosities were separated into saturated, aromatic and polar fractions using silica gel separation. The fractions, defined according to ASTM 2007, were analysed by refractive index and thin layer chromatography to ensure that separation had occurred. Some characteristics of the test oils are given in Table 1.
| Characteristic (Units) | Method | Oil No.1 | Oil No.2 | Oil No.3 |
| Glass transition temperature (˚C) | ASTM E1356 3* | -60 | -55 | -52 |
| Color | ASTM D1500 | <1.0 | <1.5 | <1.5 |
| Density at 15˚C (kg/m3) | ASTM D4052 | 0.916 | 0.921 | 0.924 |
| Refractive Index, at 20 C | ASTM D1747 | 1.502 | 1.505 | 1.508 |
| Viscosity, at 40˚C (mm/s (cSt)) | ASTM D445 | 110 | 220 | 370 |
| Viscosity, at 100˚C (mm/s (cSt)) | ASTM D445 | 8.5 | 13.3 | 18.5 |
| Sulphur (w%) | ASTM D2622 | 0.06 | 0.06 | 0.08 |
| Nitrogen (ppm) | ASTM D4629 | 56 | 316 | 489 |
| Hydrocarbon type analysis, Ca/Cn/Cp (%) |
ASTM D2140 | 11/39/50 | 12/37/51 | 13/34/53 |
Table 1. Some physical and chemical properties of the test oil
*Modified ASTM E1356-3 as described in the text
The glass transition of each fraction was measured using Differential Scanning Calorimetry (DSC), which is the most common static method for glass transition measurement. The samples were first heated to 70˚C, then cooled by 10˚C/minute to -120˚C, and finally reheated at a rate of 10˚C/minute. This cycle of heating and cooling was carried out to ensure that the samples shared the same thermal history, a factor which may otherwise have affected the measurement.
Both the refractive index and density increased from the saturated, to the aromatic, through to the polar fraction, indicating that separation had occurred. The DSC measurement revealed that Tg values of the fractions increased in the same direction (Figure 1). Despite the fact that the viscosities of the starting oils were quite different, the Tg of the fractions was quite consistent and resulted in the following: around -65˚C for the saturated fractions, around -40˚C for the aromatic fractions and around -15˚C for the polar fractions.
Glass transition temperatures for the unfractionated oils were found to be between those of the saturated and the aromatic fractions. This led us to conclude that the apparent Tg of an oil is the combined Tg of the molecular groups present. The fact that only one Tg value is obtained, despite the oil being a mixture, differentiates naphthenic oil from polymer blends, for which more than one Tg value is often seen. It also indicates that the molecular groups present in naphthenic oil are fully miscible in each other.
From this study it is clear that the molecular groups present in the oil can shift the glass transition in different directions. Therefore, there is scope for extender oils tailored to suit different application needs.
One challenging task is to optimize the composition of the oil, not only in order to arrive at the desired Tg, but also to achieve this without ignoring other important parameters of the oil. Nynas research department, utilizing the advanced processing techniques of the refinery, is well suited to continue this quest for solutions to the mystery of glass transition.
Author
Martina Levin
Project Manager
NSP Research
Nynas Naphthenics
Technical article
The closure of Group I refineries will inevitably limit the availability of the high-viscosity mineral oils commonly used in tyre tread formulations. Nynas’ new tyre oil offers an alternative with excellent performance. To address the decline of high-viscosity oils and rebalance the heavy tyre oil market, Nynas has developed a new highviscosity tyre oil. Read more about Better grip
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Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailaustria.orders@nynas.com
View all contactsElisabeth Treiber
Customer Service Executive
Phone: +43-316-73460010
Mobile: +43-664-2046516
Send an emailSabine Langmuller
Customer Service Coordinator
Phone: +43 316 734 600 20
Mobile: +43 699 100 47 707
Send an emailnordic.order@nynas.com
View all contactsMargareta Prevorsek
Customer Service Executive
Phone: +46-8-6021310
Mobile: +46-70-3148364
Send an emailindia.orders@nynas.com
View all contactsManoj Singh
General Manager / Sales Manager
Phone: +91-98-11873011
Mobile: +91-98-11873011
Send an emailSeshan Sundaram
Head of Sales Operations
Phone: +91-22-67933800
Mobile: +91-99-67356383
Send an emailYogesh Parab
Customer Service Coordinator
Phone: +91-22-67933800
Mobile: +91-98-19030107
Send an emailindonesia.orders@nynas.com
View all contactsSutarmono Id
General Manager / Sales Manager
Phone: +62-21-75924730
Mobile: +62-816-929888
Send an emailMonica Setyorini
Customer Service Coordinator
Phone: +62-21-75924730
Mobile: +62-812-8868171
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailngb.orders@nynas.com
View all contactsAbigail Waller
General Manager / Sales Manager
Phone: +44-330-1239113
Mobile: +44-78-87510555
Send an emailaustria.orders@nynas.com
View all contactsElisabeth Treiber
Customer Service Executive
Phone: +43-316-73460010
Mobile: +43-664-2046516
Send an emailSabine Langmuller
Customer Service Coordinator
Phone: +43 316 734 600 20
Mobile: +43 699 100 47 707
Send an emailIlenia Bellotti
Customer Service Executive
Phone: +39-02-6070187
Mobile: +39-331-7341909
Send an emailmexico.orders@nynas.com
View all contactsRoberto Ortiz
General Manager / Sales Manager
Phone: +52-55-55363088
Mobile: +52-1-55-54141942
Send an emailMartha Castro
Customer Service Coordinator
Phone: +52-55-55363088
Mobile: +52-1-55-54389448
Send an emailjason.wong@nynas.com
View all contactsShigeru Sano
General Manager / Sales Manager
Phone: +81-3-35603093
Mobile: +81-80-97108689
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailnordic.order@nynas.com
View all contactsMargareta Prevorsek
Customer Service Executive
Phone: +46-8-6021310
Mobile: +46-70-3148364
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailfrench.orders@nynas.com
View all contactsSheilo Mienandi
Customer Service Coordinator
Phone: +33-1-53349910
Mobile: +33-6-42009297
Send an emailnordic.order@nynas.com
View all contactsMargareta Prevorsek
Customer Service Executive
Phone: +46-8-6021310
Mobile: +46-70-3148364
Send an emailbenelux.orders@nynas.com
View all contactsLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailIlenia Bellotti
Customer Service Executive
Phone: +39-02-6070187
Mobile: +39-331-7341909
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailIlenia Bellotti
Customer Service Executive
Phone: +39-02-6070187
Mobile: +39-331-7341909
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailmexico.orders@nynas.com
View all contactsRoberto Ortiz
General Manager / Sales Manager
Phone: +52-55-55363088
Mobile: +52-1-55-54141942
Send an emailMartha Castro
Customer Service Coordinator
Phone: +52-55-55363088
Mobile: +52-1-55-54389448
Send an emailIlenia Bellotti
Customer Service Executive
Phone: +39-02-6070187
Mobile: +39-331-7341909
Send an emailfrench.orders@nynas.com
View all contactsSheilo Mienandi
Customer Service Coordinator
Phone: +33-1-53349910
Mobile: +33-6-42009297
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailbenelux.orders@nynas.com
View all contactssales.admin@molekulis.com.au
View all contactsAmanda Duncan
Customer Service Coordinator
Phone: +61-7-33906155
Mobile: +61-438-181676
Send an emailsales.admin@molekulis.com.au
View all contactsAmanda Duncan
Customer Service Coordinator
Phone: +61-7-33906155
Mobile: +61-438-181676
Send an emailnla.orders@nynas.com
View all contactsMarcela Tocelis
Sales Manager / Acting General Manager
Phone: +54-11-47770001
Mobile: +54-911-63817636
Send an emailAndrés Federuzzi
Sales Manager CMI & TYR
Phone: +54-11-47770001
Mobile: +54-911-31960832
Send an emailMartin Vergara
Customer Service Executive
Phone: +54-11-47770001
Mobile: +54-911-36974540
Send an emailJuan Pablo Pace
Customer Service Coordinator
Phone: +54-11-47770001
Mobile: +54-911-63557187
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailAbigail Waller
General Manager / Sales Manager
Phone: +44-330-1239113
Mobile: +44-78-87510555
Send an emailnordic.order@nynas.com
View all contactsMargareta Prevorsek
Customer Service Executive
Phone: +46-8-6021310
Mobile: +46-70-3148364
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailnla.orders@nynas.com
View all contactsMarcela Tocelis
Sales Manager / Acting General Manager
Phone: +54-11-47770001
Mobile: +54-911-63817636
Send an emailAndrés Federuzzi
Sales Manager CMI & TYR
Phone: +54-11-47770001
Mobile: +54-911-31960832
Send an emailMartin Vergara
Customer Service Executive
Phone: +54-11-47770001
Mobile: +54-911-36974540
Send an emailJuan Pablo Pace
Customer Service Coordinator
Phone: +54-11-47770001
Mobile: +54-911-63557187
Send an emailsales.admin@molekulis.com.au
View all contactsAmanda Duncan
Customer Service Coordinator
Phone: +61-7-33906155
Mobile: +61-438-181676
Send an emailnla.orders@nynas.com
View all contactsMarcela Tocelis
Sales Manager / Acting General Manager
Phone: +54-11-47770001
Mobile: +54-911-63817636
Send an emailAndrés Federuzzi
Sales Manager CMI & TYR
Phone: +54-11-47770001
Mobile: +54-911-31960832
Send an emailMartin Vergara
Customer Service Executive
Phone: +54-11-47770001
Mobile: +54-911-36974540
Send an emailJuan Pablo Pace
Customer Service Coordinator
Phone: +54-11-47770001
Mobile: +54-911-63557187
Send an emailnla.orders@nynas.com
View all contactsMarcela Tocelis
Sales Manager / Acting General Manager
Phone: +54-11-47770001
Mobile: +54-911-63817636
Send an emailAndrés Federuzzi
Sales Manager CMI & TYR
Phone: +54-11-47770001
Mobile: +54-911-31960832
Send an emailMartin Vergara
Customer Service Executive
Phone: +54-11-47770001
Mobile: +54-911-36974540
Send an emailJuan Pablo Pace
Customer Service Coordinator
Phone: +54-11-47770001
Mobile: +54-911-63557187
Send an emailLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailpoland.orders@nynas.com
View all contactsEdyta Bartosz
Customer Service Coordinator
Phone: +48-32-2327930
Mobile: +48-669-696116
Send an emailAldona Dziedzic
Customer Service Executive
Phone: +48-32-2327410
Mobile: +48-605-333476
Send an emailnynas.pedidos@nynas.com
View all contactsMyriam Picado
General Manager / Sales Manager
Phone: +34-917-021875
Mobile: +34-670-335355
Send an emailJose Luis Maceda
Customer Service Coordinator
Phone: +34-917 021 875
Mobile: +34-608-051706
Send an emailGloria Villaverde Parrado
Customer Service Executive
Phone: +34-917-021875
Mobile: +34-610-552947
Send an emailnla.orders@nynas.com
View all contactsMarcela Tocelis
Sales Manager / Acting General Manager
Phone: +54-11-47770001
Mobile: +54-911-63817636
Send an emailAndrés Federuzzi
Sales Manager CMI & TYR
Phone: +54-11-47770001
Mobile: +54-911-31960832
Send an emailMartin Vergara
Customer Service Executive
Phone: +54-11-47770001
Mobile: +54-911-36974540
Send an emailJuan Pablo Pace
Customer Service Coordinator
Phone: +54-11-47770001
Mobile: +54-911-63557187
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailaustria.orders@nynas.com
View all contactsElisabeth Treiber
Customer Service Executive
Phone: +43-316-73460010
Mobile: +43-664-2046516
Send an emailSabine Langmuller
Customer Service Coordinator
Phone: +43 316 734 600 20
Mobile: +43 699 100 47 707
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailAbigail Waller
General Manager / Sales Manager
Phone: +44-330-1239113
Mobile: +44-78-87510555
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailIlenia Bellotti
Customer Service Executive
Phone: +39-02-6070187
Mobile: +39-331-7341909
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailsingapore.orders@nynas.com
View all contactsLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailaustria.orders@nynas.com
View all contactsElisabeth Treiber
Customer Service Executive
Phone: +43-316-73460010
Mobile: +43-664-2046516
Send an emailSabine Langmuller
Customer Service Coordinator
Phone: +43 316 734 600 20
Mobile: +43 699 100 47 707
Send an emailaustria.orders@nynas.com
View all contactsElisabeth Treiber
Customer Service Executive
Phone: +43-316-73460010
Mobile: +43-664-2046516
Send an emailSabine Langmuller
Customer Service Coordinator
Phone: +43 316 734 600 20
Mobile: +43 699 100 47 707
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailsales.admin.brisbane@nynas.com
View all contactsAmanda Duncan
Customer Service Coordinator
Phone: +61-7-33906155
Mobile: +61-438-181676
Send an emailnynas.pedidos@nynas.com
View all contactsMyriam Picado
General Manager / Sales Manager
Phone: +34-917-021875
Mobile: +34-670-335355
Send an emailJose Luis Maceda
Customer Service Coordinator
Phone: +34-917 021 875
Mobile: +34-608-051706
Send an emailGloria Villaverde Parrado
Customer Service Executive
Phone: +34-917-021875
Mobile: +34-610-552947
Send an emailLawrence Teo
Area Sales Manager Malaysia, Sri Lanka and Bangladesh
Phone: +65 6592 0957
Mobile: +65 87230248
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailnla.orders@nynas.com
View all contactsMarcela Tocelis
Sales Manager / Acting General Manager
Phone: +54-11-47770001
Mobile: +54-911-63817636
Send an emailAndrés Federuzzi
Sales Manager CMI & TYR
Phone: +54-11-47770001
Mobile: +54-911-31960832
Send an emailMartin Vergara
Customer Service Executive
Phone: +54-11-47770001
Mobile: +54-911-36974540
Send an emailJuan Pablo Pace
Customer Service Coordinator
Phone: +54-11-47770001
Mobile: +54-911-63557187
Send an emailnynas.southafrica@nynas.com
View all contactsSamantha Moodley
Customer Service Executive
Phone: +27-10-5901052
Mobile: +27-82-5571589
Send an emailnordic.order@nynas.com
View all contactsMargareta Prevorsek
Customer Service Executive
Phone: +46-8-6021310
Mobile: +46-70-3148364
Send an emailfrench.orders@nynas.com
View all contactsSheilo Mienandi
Customer Service Coordinator
Phone: +33-1-53349910
Mobile: +33-6-42009297
Send an emailKaruna Sadasivam
General Manager / Sales Manager
Phone: +971-4-3327125
Mobile: +971-50-5535786
Send an emailSibala Libish Kumar
Customer Service Executive
Phone: +971-4-3327125
Mobile: +971-56-1148325
Send an emailLawrence Teo
Area