Rubber Compounds

They have the perfect balance of mechanical and chemical properties and thus meet the requirements of many demanding applications.

Yongrui has a variety of extruded and molded rubber compounds, and can also customize rubber compounds that meet the requirements of customers.

What are rubber compounds?

Luid Silicone Rubbers Products

Rubber compounds are synthetic elastomers mainly composed of high molecular weight linear polyorganosiloxane and silica micropowder. The system adopts an organic peroxide curative and a platinum catalyst to achieve rapid cure at high temperatures and pressure. The cured silicone elastomer has excellent mechanical properties, high and low temperature resistance, physiological inertness, and anti-aging properties, and can be used to make auto parts, various buttons, sealing rings, gaskets, rubber hoses, and cable by molding or extrusion. Rubber compounds are an environmentally friendly silicone material, ideal for the preparation of various rubber products.

Related synonyms: Silicone rubber compounds, HCR silicone， HTV silicone， High temperature vulcanized silicone rubber

Rubber compounds chemical structure

Rubber compounds, also known as solid silicone rubber or thermally vulcanized silicone rubber, are colloidal substances that compounding agents are dispersed in the raw rubber system. Compounding agents can be a softener, white carbon black, anti-structural agents, colorants, and crosslinking agents， and they can also be additives that can improve the performance of silicone rubber. The purpose of the compound rubber formula is to crack the macromolecular chain of the raw rubber under the action of machinery and heat, and cross-link with the active groups of the compounding ingredients, so as to improve the performance of the rubber, improve the process performance and reduce the cost. The most common silicone rubbers are vinyl silicone rubber, phenyl silicone rubber, and fluoro silicone rubber. Depending on the demand and end use, increasing the vinyl content or increasing the viscosity of the raw rubber changes the tear strength, elongation, and tensile strength of the product. The desired properties can also be enhanced by adding different compounding agents. For example, adding silica with a large specific surface area and a large number of Si-OH groups on the surface, such as precipitated silica or fumed silica, can improve the mechanical properties of silicone rubber. Plasticizers can be added to impart flexibility and impact resistance. Appropriate addition of anti-structural agents can effectively prevent structural and enhance storage stability. Finally, the crosslinking can be carried out using a condensation system organic peroxide crosslinker or addition system platinum catalyst according to the end use.

Rubber Compounds Product

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Silicone rubber compounds are usually processed by molding or extrusion. Yongrui is committed to providing 30-80 Shore A rubber compounds and can adjust the formula production according to customer preset requirements.

Common Precipitated Silicone Rubber

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Item	Test method	Comparison test	YR-8620	YR-8630	YR-8640	YR-8650	YR-8660	YR-8670
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness(Shore A)	GB/T531.1-2008	D2240	20±3	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.1	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	60	60	60	55	50	45
Tensile Strength(MPa)	GB/T528-2009	D412	7	9	10	10	9.5	9
Elongation(%)	GB/T528-2009	D412	800	800	700	550	500	400
Tear strength(KN/m)	GB/T529-2008	D624	20	18	25	25	25	25
Compression Set	GB/T528-2009	-	8	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.3	3.2	3.2	3.2	3.1

Note:
Solid silicone rubber： DBPH（platinum catalyst）， use Mould size:150mm×140mm175℃×5min.
Data is only for reference. Assistance with specifications is available by contacting our engineers.

High Tensile Precipitation Silicone Rubber

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Item	Test method	Comparison test	Model	YR-8631	YR-8641	YR-8651	YR-8661	YR-8671
Appearance	Visual inspection	-	/	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness	GB/T531.1-2008	D2240	shore A	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	g/cm3	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	%	55	50	50	45	45
Tensile Strength(MPa)	GB/T528-2009	D412	MPa	9.5	11	12	10	9.5
Elongation(%)	GB/T528-2009	D412	%	750	700	500	450	400
Tear strength(KN/m)	GB/T529-2008	D624	KN/m	18	25	25	25	18
Compression Set	GB/T528-2009	-	%	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	%	3.3	3.2	3.2	3.2	3.1

High Resilience Precipitation Silicone Rubber

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Item	Test method	Comparison test	YR-8633	YR-8643	YR-8653	YR-8663	YR-8673
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness（Shore A）	GB/T531.1-2008	D2240	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	70	65	65	60	55
Tensile Strength(MPa)	GB/T528-2009	D412	8	8	9	8	7
Elongation(%)	GB/T528-2009	D412	750	700	500	450	400
Tear strength(KN/m)	GB/T529-2008	D624	15	25	25	25	18
Compression Set	GB/T528-2009	-	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.2	3.2	3.2	3.1

Precipitated Silicone Rubber(Extrusion type)

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Item	Test method	Comparison test	YR-8730	YR-8740	YR-8750	YR-8760	YR-8770
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness（Shore A）	GB/T531.1-2008	D2240	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	65	60	60	55	50
Tensile Strength(MPa)	GB/T528-2009	D412	8	8	9	8	7
Elongation(%)	GB/T528-2009	D412	750	700	500	450	400
Tear strength(KN/m)	GB/T529-2008	D624	18	25	25	25	18
Compression Set	GB/T528-2009	-	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.2	3.2	3.2	3.2

Platinum Precipitated Silicone Rubber(Extrusion type)

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Item	Test method	Comparison test	YR-8730pt	YR-8740pt	YR-8750pt	YR-8760pt	YR-8770pt
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness（Shore A）	GB/T531.1-2008	D2240	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.13	11.6	11.9	1.22	1.22
Resilience	GB/T1681-2009	D2632	65	60	60	55	7
Tensile Strength(MPa)	GB/T528-2009	D412	8	8	9	8	400
Elongation(%)	GB/T528-2009	D412	750	700	500	450	400
Tear strength(KN/m)	GB/T529-2008	D624	18	25	25	25	18
Compression Set	GB/T528-2009	-	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.2	3.2	3.2	3.1

Note:
Solid silicone rubber： Platinum catalyst， use Mould size:150mm×140mm175℃×5min.
Data is only for reference. Assistance with specifications is available by contacting our engineers.

General Purpose Fumed Silicone Rubber(Molded type)

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Item	Test method	Comparison test	YR-8820	YR-8830	YR-8840	YR-8850	YR-8860	YR-8870
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness（Shore A）	GB/T531.1-2008	D2240	20±3	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.1	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	60	60	60	55	50	45
Tensile Strength(MPa)	GB/T528-2009	D412	7	9	10	10	9.5	9
Elongation(%)	GB/T528-2009	D412	800	800	700	500	450	400
Tear strength(KN/m)	GB/T529-2008	D624	20	30	30	30	25	20
Compression Set	GB/T528-2009	-	8	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.3	3.2	3.2	3.2	3.1

High Transparency Fumed Silica Silicone Rubber(Molded type)

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Item	Test method	Comparison test	YR-8822	YR-8832	YR-8842	YR-8852	YR-8862	YR-8872
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness（Shore A）	GB/T531.1-2008	D2240	20±3	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.1	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	60	60	60	55	50	45
Tensile Strength(MPa)	GB/T528-2009	D412	7	9	10	10	9.5	9
Elongation(%)	GB/T528-2009	D412	800	800	700	550	500	400
Tear strength(KN/m)	GB/T529-2008	D624	20	30	30	30	25	20
Compression Set	GB/T528-2009	-	8	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.3	3.2	3.2	3.2	3.1

Fumed Silicone Rubber(Extrusion type)

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Item	Test method	Comparison test	YR-8920	YR-8930	YR-8940	YR-8950	YR-8960	YR-8970
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness（Shore A）	GB/T531.1-2008	D2240	20±3	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.1	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	60	60	60	55	50	45
Tensile Strength(MPa)	GB/T528-2009	D412	7	9	10	10	9.5	9
Elongation(%)	GB/T528-2009	D412	800	800	700	550	500	400
Tear strength(KN/m)	GB/T529-2008	D624	20	30	30	30	25	20
Compression Set	GB/T528-2009	-	8	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.3	3.2	3.2	3.2	3.1

High Transparency Fumed Silicone Rubber(Extrusion type)

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Item	Test method	Comparison test	YR-8922	YR-8932	YR-8942	YR-8952	YR-8962	YR-8972
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent	Translucent
Hardness（Shore A）	GB/T531.1-2008	D2240	20±3	30±3	40±3	50±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.1	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	60	60	60	55	50	45
Tensile Strength(MPa)	GB/T528-2009	D412	7	9	10	10	9.5	9
Elongation(%)	GB/T528-2009	D412	800	800	700	550	500	400
Tear strength(KN/m)	GB/T529-2008	D624	20	30	30	30	25	20
Compression Set	GB/T528-2009	-	8	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.3	3.2	3.2	3.2	3.1

Platinum Fumed Silicone Rubber(Extrusion type)

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Item	Test method	Comparison test	YR-8922pt	YR-8932pt	YR-8942pt	YR-8952pt	YR-8962pt	YR-8972pt
Appearance	Visual inspection	-	Translucent	Translucent	Translucent	Translucent	Translucent	70±3
Hardness（Shore A）	GB/T531.1-2008	D2240	20±3	30±3	30±3	40±3	60±3	70±3
Density(g/cm³)	GB/T533-2008	D792	1.1	1.13	1.16	1.19	1.22	1.22
Resilience	GB/T1681-2009	D2632	60	60	60	55	50	45
Tensile Strength(MPa)	GB/T528-2009	D412	7	9	10	10	9.5	9
Elongation(%)	GB/T528-2009	D412	800	800	700	550	500	400
Tear strength(KN/m)	GB/T529-2008	D624	20	30	30	30	25	20
Compression Set	GB/T528-2009	-	8	8	7	7.5	7	5.2
Linear shrinkage	GB/T14235.4-93	CTM30157	3.3	3.3	3.2	3.2	3.2	3.1

Note:
Solid silicone rubber： Platinum catalyst， use Mould size:150mm×140mm175℃×5min.
Data is only for reference. Assistance with specifications is available by contacting our engineers.

Rubber compounds properties

Rubber compounds are also known as silicone elastomers which have both the properties of inorganic and organic materials and their overall performance is far superior to that of traditional organic rubber. Its most prominent performance is thermal stability. Even if it works in an ultra-wide temperature state (-60°～+250°) for a long time, the physical and mechanical properties are almost unchanged, and it can still maintain good elasticity. Elastomers also have excellent resistance to atmospheric aging, such as long-term exposure to natural climate conditions and light radiation, without obvious changes in physical properties. In addition, resistance to arc, corona, and electric spark is very strong, so that it has excellent electrical performance. Different additives can also be added to customize the rubber compound formulation to provide the best solution for different application performance requirements. By adding some special additives, the thermal oxidation stability of silicone rubber can be improved, the heat-resistant temperature can withstand up to 300°, and the cold-resistant minimum temperature can reach -100°. The silicone rubber containing phenyl group can be introduced to improve the radiation resistance. Add a proper amount of flame retardant to make it self-extinguishing and flame retardant which is used as an insulating material for outdoor high-voltage power transmission equipment and electrothermal equipment.

Why use rubber compounds?

Rubber compounds are used in large quantities in products that you often use in your daily life. Different performance formulas can be flexibly customized according to the final product use. Due to their excellent high and low temperature resistance, rubber compounds are widely used in rubber parts for new energy vehicles. The insulating and protective cables for vehicles are made of rubber compound materials to ensure that the cables maintain excellent flexibility in high-temperature working environments for a long time, provide designers with more freedom, and are easy to assemble and operate inside the small space of the new energy vehicle. They also have excellent tear resistance, which can effectively reduce the high-voltage component wires' risk of stress cracking and surface scratches during the turnaround, installation, and use. Rubber compounds are cured with a platinum catalyst, almost whitout by-products and corrosive gases, which is conducive to providing a safer and more comfortable environment in the car. It is also possible to use the rubber compound with excellent anti-vibration and impact resistance to make power battery pack sealant, which can ensure the normal operation of the battery under different climatic conditions.

In addition, high voltage transmission and distribution insulation applications such as insulators, arresters, through-wall bushing, and cable accessories. Industrial miscellaneous applications such as seals, oil seals, O-rings, rollers, and insulating tubing. Civilian consumer applications such as diving goggle seals, eyeglass nose pads, baby bottle nipples, and shoe liners. Other automotive applications such as ignition sleeves, axle seals, piston sheaths, front and rear spindle oil seals, front and rear crankshaft oil seals, automotive transmission belts, door and window seals, and dust jackets. Medical accessories applications such as catheters, connecting wires, connectors, tubing.

Why choose Yongrui as your partner for rubber compounds

R&D team

Rubber compounds engineers 2 people, color engineer 1 people, vulcanization experiment engineer 1 people
Workshop

With a building area of 10,000 square meters, own a rubber compounds workshop, a rubber mixing workshop, a silicone oil workshop, and a quality inspection workshop.
Production standard

We provide you with high-quality rubber compounds with FDA, ROHS, and Reach certification.
Production capacity

2000 tons/year silicone rubber compound raw materials.
Three silicone rubber compounds production lines.