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Frequently Asked Questions

Gözdeler Kauçuk > Frequently Asked Questions

Send us the technical drawing of the product and send it to us via Whatsapp. Our expert friend will give information about moulding. You can receive your sample within three working days following your approval.

EPDM can work at temperatures between -40 and +130 degrees without being affected by any external influences.

PVC wicks can be used in internal environments without changing the size if there is no pressure, acid, oil, fuel oil, etc. effect.
In external environments, it may expand depending on air temperatures.

Natural rubber is obtained from the latex of the HeveaBrasiliensis tree. The use temperature range is -60°C to 90°C. It is used where high flexibility and mechanical properties are required. The glass transition temperature (Tg) of natural rubber is around -75°C, which provides very good low temperature properties. Natural rubber has very good dew resistance and good adhesion to textiles. With these two properties, natural rubber has an irreplaceable position in the tyre industry. Natural rubber has very good tensile strength, tear strength and fatigue properties. Thanks to these properties, it is frequently used in dynamic applications (such as engine chocks, bridge chocks, tyre carcasses). However, natural rubber has poor heat and ozone ageing resistance, poor resistance to oils and solvents. Aging properties can be improved with appropriate vulcanisation selection and preservatives. Although it is not used with organic solvents, it is resistant to polar liquids. 2/3 of natural rubber is used in the production of automobile tyres, the remaining part is used in the production of mechanical parts, shoe soles (especially high quality sports shoes), hoses, conveyor belts, floor coverings, sponges and adhesives.

EPDM rubber is a kind of polymer material produced by propylene and unsaturated dieninkopolymerisation. The glass transition temperature Tg varies between -54ºC and -64ºC depending on the propylene ratio. Therefore, it has good low temperature properties. Since EPM and EPDM are saturated, their resistance to heat, oxygen, ozone and weather conditions is very good. They can be used continuously at 150ºC. Ethylene propylene rubbers do not have good resistance to oils and hydrocarbon solvents. Although EPDM is not used in the textile industry due to its poor adhesion to textiles, it has a wide range of applications in the automotive industry, especially hoses and profiles, due to its very good properties in static and dynamic applications.

Nitrile rubber is obtained by copolymerisation of butadiene and acrylonitrilmonomers. Nitrile group gives polar properties, therefore it has very good resistance to oils and solvents. Especially abrasion resistance is very good. In the same way, very good ozone resistance properties can be obtained by adding PVC to NBR paste. NBR glass transition temperature Tg can vary from -40ºC at low rates (18%) to positive values at high rates, depending on the acrylic nitrile ratio. Depending on the acrylic nitrile ratio, oil, solvent and grease resistance increases. But on the other hand, the cold resistance of nitrile rubber decreases with increasing acrylic ratio. Nitrile rubber has good heat resistance: It can be used continuously at 90ºC, at 120ºC for 40 days and at 150ºC for 3 days. Ozone resistance is poor, so PVC is added. NBR shows significantly higher electrical properties than non-polar rubbers. Therefore, it is used as electrical insulation material. NBR is used in the manufacture of gaskets, hoses, conveyor belts, brake linings, shafts, cylinders and boiler coatings.

CR, obtained by polymerisation of 2-chlorine butadiene, has satisfactory mechanical properties even without the addition of any compound due to its tendency to crystallisation. Reinforced blends have very good tensile strength, abrasion resistance, resilience properties and repeated flexural strength. Weathering and ozone resistance are also very good. Cold resistance depends on the crystallisation property and glass transition temperature (-45ºC). Thanks to the chlorine atom, CR has very good resistance to oils with aliphatic character and has the ability to self-extinguish when the flame is attracted. CR is used in the automotive, chemical, construction and machinery industries in the manufacture of profiles, hoses, gaskets, carrier wedges and V-apricots. Those with high crystallisation tendency are used in adhesive manufacturing.

Used between -60 °C and 200 °C temperatures. Intermittently resistant up to 250 °C. Not recommended for use in fuels, EP additive oils and applications requiring high mechanical properties. Excellent resistance to UV, ozone and external factors. Very good dielectric properties. It has difficult flammability, good elastic properties and physiological harmlessness. Silicone rubbers are used in cables, cable ends, insulators, keypads in the electrical sector; spark plug cables, spark plug caps, distributor cap gaskets, radiator hoses in the automotive sector; baby pacifiers and gas masks, oil seals; food, medical and construction sector and oven seals.

Polyvinyl chloride, (usually abbreviated as PVC) is a plastic with a wide range of uses in daily life. It is one of the most valuable products in the chemical industry. More than 50% of the world’s PVC is used in the construction sector. As a building material, PVC is cheap and easy to install. In recent years, PVC has replaced traditional building materials such as wood, concrete and clay in many areas. The glass transition temperature (Tg) of PVC is around 80°C. The use temperature range is -50°C to +90°C. It has a wide hardness range when appropriate modifications are made. Due to its thermoplastic properties, it is a plastic that can be recycled again. It is a product with high resistance to external conditions. It can be added externally: PVC Granule (pvccompound) is formed by polymerisation of vinyl chloride. PVC Granule, which is produced as a thermoplast product in hard, soft, opaque and transparent types, is a widely used material, especially processed with various chemicals. PVC Granule has eliminated the sovereignty of the tyre, which is used in a difficult and expensive way, especially in cable construction. PVC Granule has taken its place in this industry due to its ease of production, cheapness and resistance to environmental conditions. A large part of artificial leather, flooring materials, soft toys, cable sector, water hoses and many other soft plastic goods commonly seen in daily life are made of plasticised PVC Granules.

SEBS
They are mixtures of saturated styrene ethylene-butylene styrene (SEBS) block copolymer and Polypropylene (PP). These mixtures can be formulated in accordance with all kinds of technical applications with excellent elasticity, climate and chemical resistance properties. SEBS materials can be easily coloured by using MB from outside and can also be supplied in colour. Typical properties of SEBS materials are given below:
Hardness Range: 5 Shore A – 60 Shore D
Operating Temperature Range: -50°C to +110°C (dynamic) / -50°C to +130°C (static)
Features:
Excellent wear resistance and anti-slip properties
Elasticity and low permanent deformation across a wide temperature range
Ability to bond with a wide range of polar and non-polar materials (co-injection/co-extrusion), including PP, PA, PBT, ABS, PC, PS
Excellent resistance to UV, ozone, and weather conditions due to its saturated chain structure
High chemical resistance
Easy processing (no drying required) and recyclability
Wide product range including foamable, high-temperature resistant, flame-retardant, and other specialized types
TPV
Dynamically vulcanized ethylene/propylene (EPDM or EPM) rubber and Polypropylene (PP) blends. Vulcanized EPDM particles homogeneously dispersed in the PP matrix provide excellent rubbery-elasticity of the blends, although they can be processed like thermoplastics. TPV materials can be easily colored by using MB from outside or can be supplied in color. Typical properties of TPV materials are given below:
Hardness Range: 45 Shore A – 60 Shore D
Operating Temperature Range: -50°C to +125°C (dynamic) / -50°C to +135°C (static)
Features:
Maintains very low permanent deformation (similar to rubber materials) and elasticity across a wide temperature range
High fatigue and tear resistance
Ability to bond with a broad range of polar and non-polar materials (co-injection/co-extrusion), including PP, PA, PBT, ABS, PC, PS
Recyclable
High chemical resistance
Superior ease of processing and recyclability compared to rubber materials, offering cost efficiency
Available in a wide product range, including foamable, high-temperature and oil-resistant, flame-retardant, and other specialized types.