General Machinery & Industrial
Hydraulic cylinders, rotary shafts, pumps, and flanges — the right seal for the specific fluid, pressure, and duty cycle, not the nearest shelf item.
General industrial machinery covers the widest possible range of sealing demands — a hydraulic press cylinder running mineral oil at 350 bar, a centrifugal pump handling dilute sulphuric acid, a gearbox shaft at 3,000 RPM, and a flanged pipe connection on a steam line each require fundamentally different seal designs and materials. The common thread is that wrong seal selection in any of these situations causes a leak, a downtime event, or a safety incident. With 20 years of field experience across compound types, pressure classes, and equipment categories, ELASFOR helps maintenance and engineering teams specify the correct seal the first time — not after the first failure.
Our Products
ELASFOR Product Line — General Industrial Applications
| ELASFOR Product | Industrial Application |
|---|---|
70×70
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Rod seals, piston seals, wiper seals, and buffer seals for hydraulic cylinders — polyurethane and NBR for mineral oil (HLP); EPDM for HFA/HFB water-based fluids; FKM for phosphate ester (HFD) fire-resistant fluids; standard groove dimensions per ISO 7425 and ISO 7425-2 |
70×70
O-rings — NBR, FKM, EPDM, Silicone, FFKM
|
Hydraulic and pneumatic connections, valve bodies, pump housings, instrumentation fittings, and flange face seals — NBR is the standard for mineral oil and compressed air; FKM for elevated temperature, chemical service, or synthetic lubricant compatibility; EPDM for steam and water; FFKM for aggressive chemical service |
70×70
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Gearbox input and output shaft seals, electric motor bearing housing seals, pump shaft seals, and conveyor drive shaft seals — NBR for standard mineral oil and grease service up to 100°C; FKM for elevated temperature or synthetic lubricant service; PTFE-coated lip for low-friction, extended service life |
70×70
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Centrifugal pump shaft seals, mixer and agitator shaft seals, and compressor seal faces — carbon/ceramic or SiC/SiC face pairs depending on fluid abrasiveness; elastomeric secondary seals (O-ring or bellows); single and double mechanical seal configurations for pressurised and unpressurised service |
70×70
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Rotating shaft contamination exclusion and grease retention on conveyor drives, electric motors, and gearboxes — V-rings require no housing bore modification, seal on the shaft OD, and can be retrofitted to any shaft as a supplementary seal or to extend the life of a worn primary seal |
70×70
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Spring-energized PTFE lip seals for chemical pump shafts and valve stems where elastomeric compounds lack chemical resistance; PTFE chevron packing stacks for valve glands; PTFE-encapsulated O-rings for chemical fluid connections; custom PTFE machined seals for high-temperature valve service |
70×70
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Flange gaskets cut to print from EPDM, NBR, FKM, PTFE, ePTFE, or compressed non-asbestos fibre (CNAF) sheet; heat exchanger manhole gaskets; pump casing split-line gaskets; inspection cover and access panel gaskets for vessels and tanks; any profile cut from sheet material |
70×70
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Pump gland packing (centrifugal and reciprocating pumps), valve stem packing, and agitator shaft packing — PTFE, graphite, carbon fibre, and PTFE/graphite combination braids selected for fluid chemistry, temperature, and shaft speed; available in cross-section sizes from 3 mm to 25 mm |
70×70
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Machine door seals, access panel perimeter seals, vibration damping cord, tank hatch seals, and custom cross-section extrusions for OEM equipment — EPDM, NBR, silicone, and neoprene; P-profiles, D-profiles, T-profiles, bulb seals, and custom cross-sections to drawing |
Working from a worn or unmarked seal with no part number? Bring us the dimensions (shaft, bore, width — or cross-section sketch) and the fluid/temperature details. We identify and cross-reference most standard industrial seals from dimensions alone.
Applications
Common Sealing Applications
Hydraulic Cylinders — Rod, Piston & Wiper Seals
Industrial presses, injection moulding machines, die casting machines, metal forming equipment, paper mill roll actuators, and machine tool clamping cylinders. These are long-duty-cycle applications where cylinder seal life is expected to be measured in years, not months — demanding low-friction rod seals that minimise stick-slip at slow approach velocities, and piston seals that hold position under sustained load without drift.
Polyurethane is the upgrade material for industrial hydraulic cylinder rod seals — Shore A 90–95 PU provides superior extrusion resistance at high pressure, lower stick-slip friction than NBR at low velocities, and better abrasion resistance against rod surface imperfections. PTFE-backed bearing rings (guide rings) prevent metal-to-metal contact under side loading and are a separate item from the seals. For high-temperature applications (>80°C continuous oil temperature), confirm polyurethane thermal resistance — above 90°C, FKM or PTFE-based seals may be required.
ISO 7425 (housing dimensions — piston seals) · ISO 7425-2 / ISO 3320 (rod seal housings) · ISO 7986 (seal test methods) · ISO 6020/6022
Gearbox Shafts & Rotary Drive Seals
Industrial gearboxes (helical, bevel, worm, planetary), electric motor end-shields, conveyor drive heads, agitator and mixer shaft housings, and fan bearing housings. Rotary shaft seals in continuous-duty industrial equipment must combine low friction (to avoid lip wear and heat generation at sustained RPM), adequate contact load to retain lubricant, and a dust lip to exclude airborne contamination in harsh plant environments.
Shaft surface condition at the seal contact zone is as important as compound selection — surface finish Ra 0.2–0.5 µm, hardness HRC 45 minimum, with no lead (machining helix angle) that would pump oil out past the lip. V-rings fitted outboard of the primary lip seal add effective mud and spray exclusion at negligible cost — recommended for all outdoor or wet-area gearboxes. FKM is the specification for gearboxes using PAO, ester, or polyglycol synthetic lubricants where NBR swells unacceptably.
DIN 3760 · ISO 6194 · DIN 3761 · ISO 3601 · ASTM D2000
Centrifugal Pumps — Mechanical Seals & Gland Packing
Horizontal and vertical centrifugal pumps handling water, cooling fluids, process chemicals, and waste liquids across plant utilities, process piping, and water treatment systems. The choice between gland packing and a mechanical seal is primarily a maintenance philosophy decision — packing requires periodic adjustment and has a controlled drip, mechanical seals are theoretically zero-leak but have higher first-cost and a more defined failure mode when they go.
PTFE braided packing is the standard for most chemical and process pump glands — low friction, chemically inert, and available in FDA-compliant grades for potable water and food plant pump utilities. Graphite packing for hot water and steam service above 150°C where PTFE approaches its temperature limit. Carbon fibre packing where abrasive slurry or particulate-laden fluid would wear out softer packing fibres quickly. Mechanical face seals for new installations, high-value process fluids where zero drip is required, or where shaft sleeve wear from packing adjustment has become a recurring maintenance cost.
API 682 (mechanical seals for petroleum pumps) · ISO 21049 · DIN 24960 · ASME B73.1 (centrifugal pump standard)
Pneumatic Cylinders & Actuators
Double-acting and single-acting pneumatic cylinders, rotary actuators, air-operated clamps, and pneumatic valve actuators on automated production lines, packaging equipment, and process plant control systems. Pneumatic cylinder seals operate at lower pressures than hydraulic (typically 4–10 bar) but at much higher cycle frequencies — 1 to 10 cycles per second on production line applications is common, meaning hundreds of millions of seal strokes over equipment lifetime.
NBR is the standard compound for pneumatic cylinder seals on mineral-oil-lubricated compressed air systems. Polyurethane for high-cycle applications where NBR wear life is insufficient — PU's superior abrasion resistance extends maintenance intervals significantly on fast-cycling automation equipment. PTFE piston rings for non-lubricated or clean-room air systems where introducing lubricant to the air supply is not acceptable. Confirm compressor oil type before specifying NBR for new installations — ester-based synthetic compressor oils require FKM or fluorosilicone compounds.
ISO 16030 (pneumatic cylinder seal groove dimensions) · ISO 15552 (pneumatic cylinder standard) · ISO 4414 (pneumatic fluid power safety) · DIN 3760
Pipe Flanges & Static Equipment Gaskets
Flanged pipe connections across plant utilities (water, steam, compressed air, cooling water), process piping (acids, caustics, solvents, hydrocarbons), heat exchanger covers, pressure vessel manholes, and pump and valve body covers. Gasket selection must consider four factors simultaneously: fluid chemical compatibility, temperature range, flange face finish (raised face, flat face, ring type joint), and available bolt load — each factor independently constrains the acceptable material list.
CNAF (compressed non-asbestos fibre) is the standard general-purpose industrial pipe gasket material — suitable for most non-aggressive process services to 400°C and 100 bar depending on grade. ePTFE (expanded PTFE) for chemical service where CNAF lacks resistance and for low-bolt-load flanges where soft, conformable material is needed. FKM sheet for hydrocarbon or aggressive chemical service at elevated temperature. Always specify gasket material by fluid AND temperature — a material that works at 20°C in a given fluid may be completely incompatible at 150°C in the same fluid.
ASME B16.20 (metallic gaskets) · EN 1514-1 (flange gasket dimensions) · ISO 3601 · DIN 2690 (flange gaskets) · ASME B16.21
Compliance
Governing Standards
| Standard | Scope | What It Covers for Seals |
|---|---|---|
| ISO 7425 | Hydraulic cylinders — housing dimensions for piston seals | Groove bore diameter, width, and tolerance for piston seal installations; ensures seal interchangeability between cylinder OEMs and seal suppliers across ISO Part 1 (single-acting) and Part 2 (double-acting) |
| ISO 6547 | Hydraulic cylinders — piston seal housing dimensions with bearing rings | Groove dimensions for piston seal housings incorporating bearing rings (wear rings); does not cover rod seals — for rod seal housing dimensions use ISO 7425-2 or ISO 3320 |
| ISO 10766 | Hydraulic fluid power — wear ring housing dimensions | Dimensional standard for wear ring (bearing ring) housing dimensions in hydraulic cylinders; defines guide groove geometry, not a performance test — for seal friction and endurance testing see ISO 7986 |
| DIN 3760 / ISO 6194 | Radial shaft seals — dimensions and tolerances | Standard lip seal dimensional series; the reference for cross-referencing industrial gearbox and pump shaft seals by shaft diameter, bore, and width |
| ISO 3601 | O-ring dimensions and tolerances | Standard O-ring dimensional series (metric and inch); tolerance classes for static and dynamic applications; the reference for specifying and cross-referencing industrial O-rings |
| API 682 / ISO 21049 | Mechanical seals for petroleum and chemical pumps | Design, materials, testing, and documentation requirements for mechanical seals in process pump service; defines seal categories (1, 2, 3) and arrangements (single, dual pressurised, dual unpressurised) |
| EN 1514-1 / ASME B16.21 | Flanges and pipe connections — gasket dimensions | Standard gasket dimensions (ID, OD, thickness) for raised-face and flat-face flanges in PN and ANSI class pressure ratings; the reference for cutting or selecting replacement flange gaskets |
| ISO 6430 | Pneumatic cylinders — external mounting and interchangeability dimensions | Defines external mounting dimensions for pneumatic cylinders to ensure interchangeability between brands — does not specify internal seal groove dimensions; for pneumatic seal groove dimensions see ISO 16030 |
| ASTM D2000 / ISO 1629 | Elastomeric materials classification | Type designation system for rubber compounds by heat resistance and fluid resistance classes; the universal reference for communicating seal compound requirements between maintenance engineers and seal suppliers |
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