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High-Quality Rubber Parts, Your Ideal Choice.1
Silicone Silicone ProductsYour Ideal Choice.High-Speed Train Rubber PartsHigh-Quality Rubber Parts
Ningbo Zhongmu Rubber Products Co., Ltd
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Product Description The customization process for rubber products is a systematic approach to processing rubber materials tailored to product requirements. It encompasses material selection, performance optimization, and the adjustment of process parameters. The following outlines the core processes and technical aspects, as informed by industry practice:1. Raw Material Preparation and Pretreatment1. Main Material SelectionDepending on the product's intended use, select the appropriate type of raw rubber, such as natural rubber (for high elasticity), nitrile rubber (for oil resistance), silicone rubber (for high temperature resistance), etc.2. Compound Agent DispensingAdd vulcanizer (sulfur or peroxide), promoter, anti-aging agent, filler (carbon black or white carbon black), etc., and customize the performance by accurate weighing (with an error of 0.1%)3. Treatment of Reinforcement MaterialsThe skeletal material (steel wire or fiber) should be pretreated by soaking in rubber and drying at 60-70oC to enhance the binding strength with the rubber.2. Plastic Refining ProcessLower the molecular weight of the raw glue through mechanical extrusion (using an opening machine) or thermal oxidative degradation (using a compacting machine) to improve plasticity.1. Mechanical Plastic Smelting: Maintain a temperature of 60oC and reduce the viscosity to below 60.2. Thermoplastic Refining: Suitable for natural rubber pretreatment, introduce compressed air.3. Mixed Refining ProcessUniformly disperse the mixture in the rubber refining machine to form a mixed rubber with consistent properties.Key control points: temperature (≤120°C), time (5-15 minutes), and roll distance (1-3mm)Customized adjustments1. For high wear-resistant products: increase the carbon black content to 40-50 parts2. For high temperature resistant products: add zinc oxide (5-8 parts) and a silane coupling agent4.moulding processPlacement formingSuitable for rubber plate and sealing strip, need to control the adhesive thickness tolerance ± 0.1mmSqueeze and shapeFor the hose and sealing ring, the mouth die design directly affects the accuracy of the sectionModular pressure moldingMetal-rubber composite mold should be used for the complex structureinjection mo(u)lding Complex structural parts are multi-material composite components5. Full Test of Finished Products(1) Appearance Inspection: Examine the surface for bubbles, cracks, dimensional tolerances (± 0.1mm), and color uniformity. Utilize vernier calipers, micrometers, and other tools for measurement.(2) Physical Performance Test1. Tensile Strength: Measure the fracture strength and elongation rate in accordance with the GB/T 528-2009 standard.2. Hardness Test: Employ a Shore hardness meter (Type A/D) for measurement, conforming to the ISO 7619-1:2010 standard.3. Abrasion Resistance: Assess wear resistance using a clone wear test machine.(3) Chemical performance test Oil resistanceSoak in mineral oil or solvent for 72 hours to measure volume rate of change (e. g. 30% in NBR tube)resistance to chemical attackThe immersion test was used to evaluate the tolerance of acid and alkali (e. g. fluorine rubber and concentrated sulfuric acid) aging performance testheat deteriorationPlaced in 150oC oven for 72 hours to test hardness change (e. g. silicone rubber 15%)ultraviolet radiation agingUse the xenon lamp aging tester to simulate 500 hours of light Environmental protection and safety testing RoHS checkScreening for lead, mercury, cadmium and other harmful substances, the limit of 1000ppm (such as rubber for electronic accessories)Food contact safetyTotal migration (10 mg/dm2) and specific migration (e. g. heavy metals) were tested according to GB 4806.11-2023 standardbiocompatibilityThe total number of colonies (100 CFU / g) and sensitization were tested by the ISO 10993 standard6. Quality control1. Data record and traceability: establish complete inspection records, including test date, items, results and treatment measures of nonconforming products2. Treatment of nonconforming products: immediately isolate defective products, analyze the causes (such as formula deviation and process control) and take corrective measures7.Test standards and equipmentsurveillance projectCore standardsTypical equipmenttensile propertyGB/T 528-2009,ISO37-2005tensile machinehardnessGB/T 531.1-2008,ASTM D2240Shore durometerOzone-resistant agingGB/T 7762-2022ozone box Food contact safetyGB 4806.11-2023Analog migration TesterRoHS checkIEC 62321-7-2017X ray fluorescence spectrometer8.Performance parameters and recommendations of rubber materials(1) Rubber materials and characteristicsnative rubber(NR)High elasticity (tensile strength 20-25MPa), wear resistance, tear resistance, but poor oil resistance and ozone resistancestyrene-butadiene rubber(SBR)Excellent wear resistance (low cost), but the elasticity, tear resistance is weaker than natural rubberbutadiene rubber(BR)Outstanding cold resistance (-70oC is still elastic), wear resistance, but low strength, poor tear resistanceDing eyes rubber(NBR)Excellent oil resistance (mineral oil, lubricating oil), low compression permanent deformation, but poor low temperature resistanceethylene-propylene rubber(EPDM)Optimal weather resistance, ozone resistance, high temperature resistance (150oC), good electrical insulation, but poor oil resistancechloroprene rubber(CR)Good aging resistance, ozone resistance and flame retardant, but poor low temperature performance (brittle below-30oC)silastic(VMQ)Temperature resistance range (-70~300oC), excellent biocompatibility, but low mechanical strengthfluorine(-containing)rubber(FKM)High temperature resistance (250oC), strong acid and alkali resistance, oil resistance, but poor air permeability, high processing difficultyhydrogenated butadiene-acrylonitrile rubber (HNBR) Oil resistance, high temperature resistance is better than ordinary NBR, wear resistance is strongchlorosulfonated polyethylene(CSM) Resistance to strong acid and strong alkali (such as concentrated sulfuric acid), ozone resistance, but poor oil resistanceurethane rubber(PU)Excellent wear resistance (high Shaw hardness), tear resistance, but poor oil resistance, weak weather resistanceacrylic rubber(ACM)High temperature resistance (200oC), oil resistance (such as ester lubricating oil), but poor cold resistance(2)Comparison of key performance parametersindexNRNBRFKMSLREPDMTemperature resistance range-60~100oC-25~130oC-20~250oC-70~300oC-60~150oCoil resistivity insufficientexcellent(NBR40)extremely excellentinsufficientinsufficientozone resistanceinsufficientinsufficientexcellentexcellentexcellentabrasion performanceexcellentmiddlemiddleinsufficientexcellentElectric insulationexcellentinsufficientinsufficientexcellentexcellent(3)Suggestions for type selectionOil resistance sceneNitrile rubber (NBR) or fluorine rubber (FKM) is preferredhot environment Silicone rubber (VMQ) or fluorine rubber (FKM)resistance to chemical attack Chlorosulfated polyethylene (CSM) or fluorine rubber (FKM)dynamic packingEthpropylene rubber (EPDM) or polyurethane rubber (PU)Utilizing cutting-edge production equipment and a wealth of technical expertise, we can custom-design a range of rubber and plastic products with various specifications and materials.
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