savinobarbera@savinobarbera.com Materiale con caratteristiche più elevate, rispetto all'ossido di alluminio: maggiore resistenza agli shock termici e chimicamente inerte alle temperature di esercizio delle pompe in materiali plastici. Carburo di silicio sinterizzato (SiC, senza silicio libero). FEP - PFA. Fluoropolimeri dalle caratteristiche di resistenzachimica analoghe al PTFE ma con minore permeabilità. Si prestano a processi di saldatura: utilizzati nel rivestimento delle molle di tenute meccaniche e di O-ring. Ceramica Sinterizzata (Al

2 3

99%). MATERIALSAND COMPONENTS Materiale base per anelli di tenuta e particolari di usura. Elevata durezza, resistenza all'usura e all'azione di agenti chimici. Sconsigliato in presenza di acido fluoridrico, soda e ipoclorito di sodio ad alta concentrazione e temperatura. PTFE (Politetrafluoroetilene). Chimicamente inerte finoa 250 ° C in presenza di qualsiasi agente chimico, sconsigliatosolo per metalli alcalini fusi, per trifluoruro di cloro e fluoro gassoso ad elevate temperature. Può essere "caricato" con materiali quali il vetro o la ceramica o con grafite e carbone. Eccellente per componenti di tenuta e bussole di usura.

Problems concerning the pumping of hazardous fluids aresolved thanks to a careful selection of materials: both structuralas well as sealing and wear parts are chosen in relation tothe type of system and fluids to be conveyed. ° C. PP (Polypropylene) . Hallmarked by first-rate mechanical propertiesand an ample resistance to chemical agents. Unsuitable for highly halogenous and oxidative concentrated acids (fluorine, chlorine, bromine and iodine). Maximum working temperature: 90 ° C. PVC (Polyvinyl chloride) . Material widely used in plant engineering.Resistant to acids, bases, saline solutions and organic composites. Unsuitable for chlorinated and aromatic hydrocarbons. Maximum working temperature: 45 ° C. PVDF (Polyvinylidene fluoride). Has an exceptional resistance toacids, saline solutions, aliphatic hydrocarbons, chlorinates and aromatics, alcohol and halogens. Unsuitable for organic bases, alkaline solutions, ketones, esters and ethers. Suitable for the semiconductor industry and with liquids to be safeguarded from contamination. Maximum working temperature: 100 PE-HD (Polyethylene - High Density). Has the same chemicalresistance as polypropylene. Valued for its resistance to attack. Maximum working temperature: 60 ° C. ° C. EPDM (Ethylene-propylene terpolymer) . A highly elastic elastomerwith an optimum resistance to acids, bases, alcohol and ketones. Unsuitable for hydrocarbons, oils and greases. Maximum working temperature: 90 FPM (Fluoroelastomer rubber) . High thermal stability, lowpermanent deformation and high chemical resistance to acids, solvents, lubricants and fuels. Sintered Ceramic (Al
2 3 99%). Base material for industrial seal rings and wearelements. Elevated hardness, resistant to wear and to chemical agent attack. Not recommended at high temperatures in the presence of highly concentrated hydrofluoric acid, soda and sodium hypochlorite. Sintered silicon carbide (SiC, without free silicon). Material with greater characteristics in comparison to aluminium oxide: greater heat shock resistance and chemically inert to the working temperature of the plastic pumps. PTFE (Polytetrafluoroethylene). Chemically inert up to 250 ° Cin the presence of any chemical agent. Not advisable for alkaline welded metals, chlorine trifluoride and gaseous fluorine at high temperatures. Can be filled with materials such as glass or ceramic or with industrial graphite and carbon. Ideal for sealing elements and wear sleeves. FEP and PF A. Fluoroplastics having the same characteristics asthat of the PTFE but with less permeability. Ideal for welding processes: used for the covering of mechanical seal springs and O-rings.

materiali e componenti

MATERIALS AND COMPONENTS