Sykkeenvaimentimet, Shokkivakauttajat & Akkumulaattorit
Vesipaineiskuvakauttajat Paineiskutasaajat Nestevoima akkumulaattorit Pumput Suomi
| Hakemisto / Sijaintikartta |
Metals316 ss from inventory (this is NOT NEVER with Ti additives The 316 stainless that we use is "dual certified", 17-4 PH Hydraulic / Fluid Power products are from carbon steel as standard, with Alloy 20. some samller volume units in stock/inventory, we hold more Duplex and Super Duplex stainlesses are stock / inventory in smaller volumes Some Hasteloy C276 component parts are on the shelf, and we hold Titanium 2. is readily avaliable at reasonable cost and on short lead "Monel" We hold a little Cupro Nickel 400 grade. Tantalum and Zirconium pieces are only made to order PIPE, and also Tubes. PLASTICS, and plastic pipe limited to :- Materials above 150mm diameter and up to 300mm are made from BASICALLY OTHER ADVICE :- People are beginning to realize the disaster of German Ti modified Stainless. HEAT TREATMENT We stress relieve "solution anneal" all stainless. |
ElastomersElastomer Availibility
Common Elastomer Availability from MEMBRANO_FLEX Ltd. Div of LDI Ltd for you to choose from:- Information Source - edited from "KEVIN-TECH" aka Kevin Bebb's
Technical Notes - LDI Ltd. in-house proprietary , since 1963. The compound ingredient percentages are chosen by LDI Ltd. to cause similar physical properties, and from advice by the Rubber & Plastics Research Association (aka RAPRA.) and others. :- In the uncured / un-polymerized state,:
To be easily transfer-injectable over distances greater than 3x the item diameter, without the use of long oil alkids etc. for plasticization. In the cross linked / polimerized state, to have
1. Elongation at break in excess of 600%, 2. UTS grater than 2000 psi (140 bar) 3. IRH Shore "A" scale hardness 55-60, 4. Compression set resistance for seal-points. ETC. MATERIAL TO CHOOSE FROM.
Note - "LDI" are not compatibility engineers . Be sure to check your selection against the "O" rings Seal, gasket, valve diaphragm, pump packings that have proved satisfactory for your system. Errors and Omissions Excepted. "E&OE" -------------------------------------------------------------------- ASTM ELASTOMER DESIGNATIONS WITHIN LDI Ltd (MembranoFlex)
AVAILABILITY :- "FFKM", "PIB" , "EP" "EPDM" "EPR" , "ECO", "FKM", "CSPE", "NR", "CR", "NBR", "MQ, VMQ, PVMQ, FVMQ," "T Also ST". Etcetera Aflas TM Perfluoro-elastomer tetrafluoro-ethylene-propylene aka "FFKM" Temperatures 450 Degrees F tear resistance POOR Typical Uses Sour Service - H2S Other More Detail http://www.darcoid.com/includes/tetrafluoroethylene--- propylene-aflas.html Butyl Rubber Poly-Iso-Butylene aka "PIB" , newer Halobutyl Not easily "bondable". Temperatures tear resistance fail Typical Uses Automobile inner tubes Other Oxygen permeation resistance More Detail http://en.wikipedia.org/wiki/Butyl_rubber Nordel TM EPCAR TM , VISTALON TM
Generic - EPT Ethylene Propylene Terpolymer Peroxide Cured aka EP,"EPDM" (D M Diamine-Monomer not understood - it is no longer a monomer when polimerized), aka also "EPR". Temperatures 300 F tear resistance good Typical Uses water based, wide applications (not OILS, Hydrocarbons) Other Good abrasion resistance, low cost More Detail http://www3.interscience.wiley.com/journal/104021283/ abstract?CRETRY =1&SRETRY=0 Epichlorohydrin
aka "ECO" Temperatures High and Low tear resistance fair Typical Uses resistance to fuel oil, Other http://www.hubeichem.com/products-e2.htm More Detail http://www.primasil.com/polymers/text.asp?PageId=42 Fluoro Elastomers aka "FKM" Trade names Fluorel TM, Viton TM Common variants "A", "B", "B50","E60C", "GS" Temperatures HIGH tear resistance BAD Typical Uses, result of much hype, Viton TM Thought to be a panacia. Other Expensive, elongation / elasticity very poor, & NOT for low temperature use at all. More Detail http://www.knovel.com/web/portal/browse/display?_EXT_ KNOVEL_DISPLAY_ bookid=1323 Hypalon TM (Per Dupont is Obselecent)
Chloro-Sulfonated PolyEthylene aka "CSPE" & synthetic rubber (CSM) Temperatures :- extremes tear resistance Typical Uses Chemical Resistance Other More Detail http://en.wikipedia.org/wiki/Hypalon Natural Rubber "Indico" aka "NR" Temperatures moderate tear resistance good , ebrasion resistance good Typical Uses ambient temperature hose Other Highly elastic - diametric opposite to fluoro-elastomers. More Detail http://www.rubber-stichting.info/ Neoprene generic "polychloroprene" aka "CR" Temperatures Good high temp aging resistance tear resistance Fair Typical Uses Automotive parts Other resists some specialty chemicals More Detail http://www.dupontelastomers.com/products/neoprene/neoprene.asp Nitrile rubbers,
Butadiene-Acrylonitrile, aka "NBR" (in a low grade aka "Buna N") Common Variants : a. Low temp Nitrile - to negative 70 50 F? C? b. High Temp Nitrile - c. Hydrogenated ("HNBR") Increase properties , and some CO2 permiation resistance d. FDA ingredient versions, White, Temperatures according to variant tear resistance, Fair, abrasion resistance good Typical Uses Hydrocarbon liquids, fluid power hydraulics Other Reasonable price More Detail http://www.ashtabularubber.com/nitrile-page.html Silicone Rubber - wide varieties
aka MQ, VMQ, PVMQ Fluoro-silicone aka FVMQ Temperatures up to 500 F hot tear resistance BAD Typical Uses external environments UV resistance, and medical Other difficult to inflate without tearing for tool release More Detail http://www.dowcorning.com/content/rubber/silicone- rubber.aspx Thiocol TM
Generic "PolySulfide" aka "T" "ST" Temperatures Good for ultra low tear resistance poor, suffers compression set Typical Uses Solvents, rocket fuel seals Other Difficulties with mold (mould) release. More detail http://www.britannica.com/EBchecked/topic/469125/polysulfide-rubber ====================================================================
GENERAL COMPARISONS
http://www.ashtabularubber.com/elastomerselection-page.html GENERAL NOTE - CAVEAT A typical elastomer compound may have at least :- The named Elastomer, an activator, an accelerator, the curing - cross linking agent , a plasticizer (PREFERABLY cross-linking) anti ozonant, fillers typically chimney / furnace black, etc . Up to a dozen constituents. The performance of any one of the above available synthetic "rubbers" depends on the experience of the compound formulator and a full disclosure by the end user of all the details of the actual application. =================================================================
NON ELASTOMERS - IE "PLASTOMERS". "Flexflon" TM
aka LDI "DW series" PTFE that has been raised to 730 F gell temperature converting all PTFE sintered prcipitate particles into one homogeneous plastic. Imparts some resilience and enable flexibility when combined with concentric wave shaped corrugations. Servicability as PTFE Availability membranes up to 305mm diameter, 320 in3 5.25 Liter . Virgin PTFE,
aka LDI "DF series" has bonded high temp EPT backing to provide some resilience - to impede the "cold flow" of PTFE. and slow the rate of permeation experienced with virgin PTFE (aka "Teflon" TM) because of its sintered particulate nature. Availability Membranes up to 454mm diameter, 1000 in3 16.4 liter . Trade names / trade marks, noted here in "TM" are the property of
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PulseGuard varaosat, Liquid Dynamics varaosat, ShockGuard varaosat, & LDi varaosat
Pumput Suomi / sykkeenvaimentimet kuvaukset ovat saatavana koulutuskäyttöä varten seuraavasta linkistä: "Harri Österman"