Polyurethane Wheels, Polyurethane High Railway Shock Absorbers, Rubber Wheels, Plastic Wheels, and Hardware Forks
Hangzhou Gravity Caster Technology Co., Ltd (Owned by Ningbo Best Polyurethane Co., Ltd) is the most largest enterprise located in Tonglu, Hangzhou, which is voted by government as the most beautiful town in China. It owns the most professional technology in producing polyurethane products, polyurethane wheels, polyurethane high railway shock absorbers, rubber wheels, plastic wheels, and hardware forks. With full automatic foundry casting line equipment and five automatic aluminum www.gravitycaster.com die casting machines, we guarantee the quality of product from beginning to the end. It has a total of nine buildings of workshops, are composed of injection molding, mold, aluminum die casting, rubber, rubber compound, machining, casting, PU reactive synthesis. The original company was founded in 1988 (subordinate company with house property, shipping, hotel, aquaculture). We are always In line with "the character, the product, springtime delights refinement. This year, next year, every is changing" enterprise spirit, and adhere to "quality of survival, integrity and development" business approach. With the company continuously developed, we introduced new company Hangzhou Gravity Caster Technology Co., Ltd in TongLu Economic Development Zone, Hangzhou, China, the new plant covers an area of 60,000 squre meters. The original company's various series wheels, polyurethane high railway shock absorbers, are with strong strength, strong bonding. We enter into southeast Asia, European, USA market with our reliable quality and excellent after-sale service, ninety percent of products are exported, and win the trust and support from customers. On this basis, Hangzhou Gravity Caster Technology Co., Ltd will become a wordwide production and supply base for "polyurethane products and polyurethane wheels, polyurethane high railway shock absorbers". The company will strive for better quality, more efficient service to the customers. Your satisfying is our eternal pursuit. Professional technical force, is your best choice.
Ningbo Haian Polyurethane Hangzhou Gravity Caster Products Co., Ltd Technology Co., Ltd The founder Mr. Hean Li in early years The most professional polyurethane, of start up in Ningbo, China. 90% of products are exported. 1988 2016
Ningbo Best Polyurethane Co., Ltd Best Polyurethane plant in Ningbo, China. 2003
Concentricity testing machine
Resilience testing machine Caster brake life GRAVITY Salt spray testing machine Life testing machine No.2 testing machine CASTER Starting and rolling Starting and rolling resistance resistance testing testing machine No.2 GRAVITY machine No.1 CASTER Adhensive testing Electrical pulling machine POLYURETHANE WHEEL testing machine Hangzhou Gravity Caster Technology Co., Ltd
● Address: 69 Yinjia Road, Tonglu Economic Development Zone, Tonglu County, Hangzhou City, Strong strength/Great adhesion/Firmly bonded Zhejiang Province,China ● Zip code: 311500 Automatic assembly line Bray pouring machine Automatic synthesis system ● Tel: 0571-2960 6635 / 36 ● Fax: 0571-2960 6633 ● E-mail: [email protected] ● http://www.gravitycaster.com / http://gb.haiyoucasters.com Automatic equipments/testing instruments EACH WHEEL TO BE FULL INSPECTION
Castor Hardeness impact testing Life testing machine No.1 Automatic pouring machine testing machine machine Large caster life testing machine Hangzhou Gravity Caster Technology Co., Ltd (Owned by Ningbo Best Polyurethane Co., Ltd) is the most largest Hangzhou Gravity Caster Technology Co., Ltd (Owned by Ningbo Best Polyurethane Co., Ltd) is the most largest enterprise located in Tonglu, Hangzhou, which is voted by government as the most beautiful town in China. It owns the most enterprise located in Tonglu, Hangzhou, which is voted by government as the most beautiful town in China. It owns the most professional technology in producing polyurethane products, polyurethane wheels, polyurethane high railway shock absorbers, professional technology in producing polyurethane products, polyurethane wheels, polyurethane high railway shock absorbers, rubber wheels, plastic wheels, and hardware forks. With full automatic foundry casting line equipment and five automatic aluminum www.gravitycaster.com rubber wheels, plastic wheels, and hardware forks. With full automatic foundry casting line equipment and five automatic aluminum www.gravitycaster.com die casting machines, we guarantee the quality of product from beginning to the end. It has a total of nine buildings of workshops, are die casting machines, we guarantee the quality of product from beginning to the end. It has a total of nine buildings of workshops, are composed of injection molding, mold, aluminum die casting, rubber, rubber compound, machining, casting, PU reactive synthesis. composed of injection molding, mold, aluminum die casting, rubber, rubber compound, machining, casting, PU reactive synthesis. The original company was founded in 1988 (subordinate company with house property, shipping, hotel, aquaculture). We are The original company was founded in 1988 (subordinate company with house property, shipping, hotel, aquaculture). We are always In line with "the character, the product, springtime delights refinement. This year, next year, every is changing" enterprise spirit, always In line with "the character, the product, springtime delights refinement. This year, next year, every is changing" enterprise spirit, and adhere to "quality of survival, integrity and development" business approach. With the company continuously developed, we and adhere to "quality of survival, integrity and development" business approach. With the company continuously developed, we introduced new company Hangzhou Gravity Caster Technology Co., Ltd in TongLu Economic Development Zone, Hangzhou, China, introduced new company Hangzhou Gravity Caster Technology Co., Ltd in TongLu Economic Development Zone, Hangzhou, China, the new plant covers an area of 60,000 squre meters. The original company's various series wheels, polyurethane high railway shock the new plant covers an area of 60,000 squre meters. The original company's various series wheels, polyurethane high railway shock absorbers, are with strong strength, strong bonding. We enter into southeast Asia, European, USA market with our reliable quality absorbers, are with strong strength, strong bonding. We enter into southeast Asia, European, USA market with our reliable quality and excellent after-sale service, ninety percent of products are exported, and win the trust and support from customers. On this and excellent after-sale service, ninety percent of products are exported, and win the trust and support from customers. On this basis, Hangzhou Gravity Caster Technology Co., Ltd will become a wordwide production and supply base for "polyurethane products basis, Hangzhou Gravity Caster Technology Co., Ltd will become a wordwide production and supply base for "polyurethane products and polyurethane wheels, polyurethane high railway shock absorbers". and polyurethane wheels, polyurethane high railway shock absorbers". The company will strive for better quality, more efficient service to the customers. The company will strive for better quality, more efficient service to the customers. Your satisfying is our eternal pursuit. Professional technical force, is your best choice. Your satisfying is our eternal pursuit. Professional technical force, is your best choice.
Ningbo Haian Polyurethane Hangzhou Gravity Caster Ningbo Haian Polyurethane Hangzhou Gravity Caster Products Co., Ltd Technology Co., Ltd Products Co., Ltd Technology Co., Ltd The founder Mr. Hean Li in early years The most professional polyurethane, The founder Mr. Hean Li in early years The most professional polyurethane, of start up in Ningbo, China. 90% of products are exported. of start up in Ningbo, China. 90% of products are exported. 1988 2016 1988 2016
Ningbo Best Polyurethane Co., Ltd Ningbo Best Polyurethane Co., Ltd Best Polyurethane plant in Ningbo, China. Best Polyurethane plant in Ningbo, China. 2003 2003
Concentricity Concentricity testing machine testing machine
Resilience testing machine Resilience testing machine Caster brake life GRAVITY Caster brake life GRAVITY Salt spray testing machine Life testing machine No.2 testing machine Salt spray testing machine Life testing machine No.2 testing machine CASTER Starting and rolling CASTER Starting and rolling Starting and rolling resistance resistance testing Starting and rolling resistance resistance testing testing machine No.2 GRAVITY machine No.1 testing machine No.2 GRAVITY machine No.1 CASTER CASTER Adhensive testing Adhensive testing Electrical pulling machine Electrical pulling machine POLYURETHANE WHEEL testing machine POLYURETHANE WHEEL testing machine Hangzhou Gravity Caster Technology Co., Ltd Hangzhou Gravity Caster Technology Co., Ltd
● Address: 69 Yinjia Road, Tonglu Economic Development Zone, Tonglu County, Hangzhou City, Strong strength/Great adhesion/Firmly bonded ● Address: 69 Yinjia Road, Tonglu Economic Development Zone, Tonglu County, Hangzhou City, Strong strength/Great adhesion/Firmly bonded Zhejiang Province,China ● Zip code: 311500 Zhejiang Province,China ● Zip code: 311500 Automatic assembly line Bray pouring machine Automatic synthesis system Automatic assembly line Bray pouring machine Automatic synthesis system ● Tel: 0571-2960 6635 / 36 ● Fax: 0571-2960 6633 ● Tel: 0571-2960 6635 / 36 ● Fax: 0571-2960 6633 ● E-mail: [email protected] ● E-mail: [email protected] ● http://www.gravitycaster.com / http://gb.haiyoucasters.com ● http://www.gravitycaster.com / http://gb.haiyoucasters.com Automatic equipments/testing instruments Automatic equipments/testing instruments EACH WHEEL TO BE FULL INSPECTION EACH WHEEL TO BE FULL INSPECTION
Castor Castor Hardeness impact testing Hardeness impact testing Life testing machine No.1 Automatic pouring machine testing machine machine Large caster life testing machine Life testing machine No.1 Automatic pouring machine testing machine machine Large caster life testing machine MATERIAL NAME AND PERFORMANCE PROFILE
● Prothane® Prothane ® Elaxthane ® Gravollan ® Performance：It has the advantages of good hydrolysis properties and low temperature flexibility. But the resistance, low temperature resistance, easy water heat resistance is not good. It is suitable for uneven Prothane has a very good flexibility at low Elaxthane has very high modulus and strength, Gravollan has better performance compared absorption of raw materials, simple process and low price. ground work enviroment. But not heat resistant, mechanical properties and elasticity temperature and hydrolysis resistance. Although its offer excellent resilience, great abrasion resistance, with Maxthane. It has more excellent mechanical and are not good. Not suitable for forklift truck, suitable for ● Maxthane® mechanical properties is not so good. With low viscosity. mildew resistance, oil resistance, dynamic mechanical physical property. Such as high resistant to wear, heat, casters, applicable to Southeast asia. Performance: Maxthane has very high tensile Pro means "professional". Prothane is our most popular and most strength, low temperature flexibility, excellent It is easy to be miscibility with isocyanate additive properties, electrical insulation and corrosion, high strength, less endogenous heat, productive material.The number of prepolymer is P121, P122. elasticity, hydrolysis resistance, weatherresistance, components. Excellent processing performance. Also properties and low temperature flexibility. But the lightly damped, oil resistance and corrosion resisitance, ® ● Toughthane excellent tear resistance and abrasion resistance, has great advantage on price. heat resistance is not good. long lifetime and other characteristics. Performance：It has the advantages of wear high temperature adhesion, solvent resistance and Prothane caster can’t be used on uneven road, Because of its excellent elasticity, elaxthane Less endogenous heat is the most prominent resistance, heat resistance, oil resistance and other chemical properties. It is better than Tongthane's mechanical properties. The elasticity is higher heat resistance, The proportion of deformation by neither for forklift truck. It is most commonly applied casters are suitable to trolley. It can not be too bumpy characteristics from Gravollan to Maxthane. than Prothane, but the water resistance and low Compressed permanent is lower than other. to standard caster. Especially suitable for outdoor when traveling on the uneven road surface. Its heat So Gravollan caster is much more suitable for high MAX means maxmium. Maxthane is one of the best temperature resistance are not good. Suitable for moisture environment. Like Southeast Asia. Model resistance is not good, not suitable for high temperature dynamic load capacity, high speed running and high light forklift truck and electric truck. material with comprehensive performance. The pre- Tough means "toughness", which means that polymer grade used is M421. P121 pre polymers is recommended. And Model P122 environment or high speed operation situation, so it temperature occasion. Also Gravollan is available for Toughthane is a high strength material. The number pre polymers is commonly used on the products with can’t applied for heavy-duty high-end forklift. The the driving wheel and driven wheel of heavy high-end ● Gravollan® of prepolymer is P221, P222. hardness higher than 60D. Such as pure PU wheel. prepolymer model of Elaxthane is E321. electric forklift. Prepolymer model is G521. Performance: Excellent mechanical property,High ® ● Elaxthane wear resistant, Lightly damped, High resilience, Performance: Elaxthane has very high modulus and Less endogenous heat,Long life. strength, offer excellent resilience, great abrasion Gravollan is a combination of Gravity and Vulkollan, resistance, mildew resistance, oil resistance, mean Gravity Vulkollan dynamic mechanical properties, electrical insulation G521 is the Prepolymer trademark of Garvollan.
Standard Prothane Toughthane Elaxthane Maxthane Gravollan
Prepolymer trademark P121 P122 T221 T222 E321 M421 G521 Toughthane ® Maxthane ®
Shore hardness GB/T2411-2008 93±3A 62±3D 93±3A 93±3A 93±3A 93±3A 93±3A Toughthane has very high mechanical strength and Maxthane has excellent hydrolytic stability and Rebound resilience GB/T1681-2009 20~25% 40~45% 30~35% 30~35% 45~55% 55~65% 55~65% hardness. Abrasion resistance. Oxidation resistance.Oil high&low temperature performance. It also has higher 30~35 30~35 40~45 40~45 30~35 35~40 35~40 Tensile strength GB/T528-2009 resistance. Heat resistance.But its hydrolysis resistance tensile strength, low temperature flexibility, excellent Mpa Mpa Mpa Mpa Mpa Mpa Mpa and low temperature resistance are not so good. elasticity, weatherresistance, excellent tear resistance Elongation at break GB/T528-2009 400~600% 250~400% 400~600% 400~600% 500~700% 500~700% 500~700% Toughthane caster is suitable for higher and abrasion resistance, high temperature adhesion, 75~85 110~120 100~110 100~110 85~95 105~115 105~115 Tearing strength GB/T529-2008 temperature.Corrosive and oily enviroment. Not solvent resistance and other chemical properties. It is N/mm N/mm N/mm N/mm N/mm N/mm N/mm suitable for cold areas and moisture enviroment. It better than Tongthane's heat resistance,The proportion Compression set resistant 0 ++ + + ++ ++ ++ can be applied to light and electric forklift truck. Model of deformation by Compressed permanent is lower than Hydrolysis resistance + + 0 0 + + + T222 pre polymers is recommended.And Model T222 other . Oil resistance 0 0 ++ ++ ++ ++ ++ prepolymers is commonly used on products have Maxthane Caster is suitable for humidity, oil, high
Anti-UV 0 0 + + + + ++ special requirements ( free of MOCA) from Europe. temperature, low temperature and uneven ground
The dynamic load capacity 0 0 + + + ++ ++ and other environment, and also for high dynamic load environment. It is apply to heavy-duty, high-quality Cut and tear resistant + + ++ ++ + ++ ++ electric forklift drive wheel and bearing wheel. The pre- High speed applicability 0 0 + + + ++ ++ polymer Model is M421. Abrasive resistance + + ++ ++ ++ ++ ++
Remark：++Excellent +Good 0 Common MATERIAL NAME AND PERFORMANCE PROFILE
● Prothane® Prothane ® Elaxthane ® Gravollan ® Performance：It has the advantages of good hydrolysis properties and low temperature flexibility. But the resistance, low temperature resistance, easy water heat resistance is not good. It is suitable for uneven Prothane has a very good flexibility at low Elaxthane has very high modulus and strength, Gravollan has better performance compared absorption of raw materials, simple process and low price. ground work enviroment. But not heat resistant, mechanical properties and elasticity temperature and hydrolysis resistance. Although its offer excellent resilience, great abrasion resistance, with Maxthane. It has more excellent mechanical and are not good. Not suitable for forklift truck, suitable for ● Maxthane® mechanical properties is not so good. With low viscosity. mildew resistance, oil resistance, dynamic mechanical physical property. Such as high resistant to wear, heat, casters, applicable to Southeast asia. Performance: Maxthane has very high tensile Pro means "professional". Prothane is our most popular and most strength, low temperature flexibility, excellent It is easy to be miscibility with isocyanate additive properties, electrical insulation and corrosion, high strength, less endogenous heat, productive material.The number of prepolymer is P121, P122. elasticity, hydrolysis resistance, weatherresistance, components. Excellent processing performance. Also properties and low temperature flexibility. But the lightly damped, oil resistance and corrosion resisitance, ® ● Toughthane excellent tear resistance and abrasion resistance, has great advantage on price. heat resistance is not good. long lifetime and other characteristics. Performance：It has the advantages of wear high temperature adhesion, solvent resistance and Prothane caster can’t be used on uneven road, Because of its excellent elasticity, elaxthane Less endogenous heat is the most prominent resistance, heat resistance, oil resistance and other chemical properties. It is better than Tongthane's mechanical properties. The elasticity is higher heat resistance, The proportion of deformation by neither for forklift truck. It is most commonly applied casters are suitable to trolley. It can not be too bumpy characteristics from Gravollan to Maxthane. than Prothane, but the water resistance and low Compressed permanent is lower than other. to standard caster. Especially suitable for outdoor when traveling on the uneven road surface. Its heat So Gravollan caster is much more suitable for high MAX means maxmium. Maxthane is one of the best temperature resistance are not good. Suitable for moisture environment. Like Southeast Asia. Model resistance is not good, not suitable for high temperature dynamic load capacity, high speed running and high light forklift truck and electric truck. material with comprehensive performance. The pre- Tough means "toughness", which means that polymer grade used is M421. P121 pre polymers is recommended. And Model P122 environment or high speed operation situation, so it temperature occasion. Also Gravollan is available for Toughthane is a high strength material. The number pre polymers is commonly used on the products with can’t applied for heavy-duty high-end forklift. The the driving wheel and driven wheel of heavy high-end ● Gravollan® of prepolymer is P221, P222. hardness higher than 60D. Such as pure PU wheel. prepolymer model of Elaxthane is E321. electric forklift. Prepolymer model is G521. Performance: Excellent mechanical property,High ® ● Elaxthane wear resistant, Lightly damped, High resilience, Performance: Elaxthane has very high modulus and Less endogenous heat,Long life. strength, offer excellent resilience, great abrasion Gravollan is a combination of Gravity and Vulkollan, resistance, mildew resistance, oil resistance, mean Gravity Vulkollan dynamic mechanical properties, electrical insulation G521 is the Prepolymer trademark of Garvollan.
Standard Prothane Toughthane Elaxthane Maxthane Gravollan
Prepolymer trademark P121 P122 T221 T222 E321 M421 G521 Toughthane ® Maxthane ®
Shore hardness GB/T2411-2008 93±3A 62±3D 93±3A 93±3A 93±3A 93±3A 93±3A Toughthane has very high mechanical strength and Maxthane has excellent hydrolytic stability and Rebound resilience GB/T1681-2009 20~25% 40~45% 30~35% 30~35% 45~55% 55~65% 55~65% hardness. Abrasion resistance. Oxidation resistance.Oil high&low temperature performance. It also has higher 30~35 30~35 40~45 40~45 30~35 35~40 35~40 Tensile strength GB/T528-2009 resistance. Heat resistance.But its hydrolysis resistance tensile strength, low temperature flexibility, excellent Mpa Mpa Mpa Mpa Mpa Mpa Mpa and low temperature resistance are not so good. elasticity, weatherresistance, excellent tear resistance Elongation at break GB/T528-2009 400~600% 250~400% 400~600% 400~600% 500~700% 500~700% 500~700% Toughthane caster is suitable for higher and abrasion resistance, high temperature adhesion, 75~85 110~120 100~110 100~110 85~95 105~115 105~115 Tearing strength GB/T529-2008 temperature.Corrosive and oily enviroment. Not solvent resistance and other chemical properties. It is N/mm N/mm N/mm N/mm N/mm N/mm N/mm suitable for cold areas and moisture enviroment. It better than Tongthane's heat resistance,The proportion Compression set resistant 0 ++ + + ++ ++ ++ can be applied to light and electric forklift truck. Model of deformation by Compressed permanent is lower than Hydrolysis resistance + + 0 0 + + + T222 pre polymers is recommended.And Model T222 other . Oil resistance 0 0 ++ ++ ++ ++ ++ prepolymers is commonly used on products have Maxthane Caster is suitable for humidity, oil, high
Anti-UV 0 0 + + + + ++ special requirements ( free of MOCA) from Europe. temperature, low temperature and uneven ground
The dynamic load capacity 0 0 + + + ++ ++ and other environment, and also for high dynamic load environment. It is apply to heavy-duty, high-quality Cut and tear resistant + + ++ ++ + ++ ++ electric forklift drive wheel and bearing wheel. The pre- High speed applicability 0 0 + + + ++ ++ polymer Model is M421. Abrasive resistance + + ++ ++ ++ ++ ++
Remark：++Excellent +Good 0 Common