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Quick Answer: CORASEALS supplies pneumatic seals from China for global buyers. The range includes piston seals, rod seals, wiper seals, scraper seals, O-rings, backup rings, wear rings, guide rings, and pneumatic cylinder seal kits. Send cylinder bore, rod diameter, groove dimensions, medium, pressure, temperature, speed, material, drawing, sample photo, and quantity to request a pneumatic seal quotation.
Pneumatic cylinders use different seal profiles at different positions. A piston seal seals between the piston and cylinder bore. A rod seal seals between the cylinder head and the piston rod. A wiper seal or scraper seal stops dust and moisture from entering the cylinder. Wear rings and guide rings support the piston and rod against side load.
CORASEALS supplies pneumatic piston seals, rod seals, wiper seals, scraper seals, O-rings, backup rings, wear rings, guide rings, and complete pneumatic cylinder seal kits. The seals can be matched to standard cylinder housings or custom machined to a customer drawing.
Common seal profiles include single lip U-cup seals, O-ring loaded U-cup seals, compact piston seals, rod lip seals, and PTFE based wear rings. The correct profile depends on the groove shape, the cylinder bore, the rod diameter, and the operating conditions.
Pneumatic seals operate under different conditions than hydraulic seals. Compressed air systems usually work at lower pressure than hydraulic systems. Air cylinders often run with less internal lubrication, especially when the system uses dry air. The seal must balance sealing force and friction. A seal that works well in hydraulic oil may create too much friction in a pneumatic cylinder.
Hydraulic seals focus more on high pressure extrusion resistance and fluid film control. Pneumatic seals focus more on low friction, wear life, and clean operation. CORASEALS evaluates the medium and the cylinder condition before recommending a seal profile.
Pneumatic seal material selection starts with the compressed air condition and the cylinder lubrication method. NBR is a common choice for air with oil mist and normal temperature. Polyurethane or TPU often provides better wear life and lower friction under clean air conditions. FKM is used when the compressed air has higher temperature or contains aggressive synthetic oil. EPDM works in oil-free air and has good ozone resistance. EPDM is not suitable for most mineral oil lubricated systems. PTFE is used for wear rings, backup rings, and low friction applications.
Do not select a pneumatic seal by material only. The material must match groove dimensions, cylinder pressure, rod speed, cycle frequency, and the surface finish of the mating parts. A seal that works in a slow moving cylinder may fail in a high cycle cylinder with dry air.
Many pneumatic cylinders also use O-rings for static sealing on end caps, ports, cushion adjusters, and rod wiper housings. O-ring grooves should follow the standard size and tolerance for the chosen O-ring. CORASEALS supplies O-rings in AS568, ISO 3601, and JIS B 2401 sizes. Custom O-ring dimensions are also available.
For dynamic pneumatic O-ring applications, check the running clearance and use a backup ring where needed. The backup ring prevents extrusion under pressure peaks.
Pneumatic seal buyers often ask by cylinder model or profile code. Codes can help identify seals, but the same code may have different meanings in different supplier catalogs. CORASEALS verifies each seal by groove ID, groove OD, groove width, groove depth, rod diameter, and bore diameter.
O-rings can follow AS568, ISO 3601, JIS B 2401, or custom dimensions. Piston seals, rod seals, and wiper seals often follow the housing dimensions specified by the cylinder manufacturer. If you have a drawing or a used sample, the drawing or sample photo reduces the risk of quoting the wrong profile.
Pneumatic seal life depends heavily on the rod surface finish, bore finish, and groove entry chamfer. A damaged rod surface will shorten rod seal life. Sharp corners in the groove can cut the seal during installation. Correct gland design and clean assembly are as important as material selection.
When replacing pneumatic seals, check the rod for scoring, pitting, or corrosion. Check the bore for wear and scoring. Clean the cylinder before installation. Use proper assembly tools. Do not twist or overstretch a pneumatic seal during fitting.
Common failure causes include incorrect material for the air quality, worn rod or bore surface, excessive running clearance, incorrect groove dimensions, extrusion, side load without adequate wear rings, and poor lubrication. If a seal fails early, CORASEALS can help review the groove, the mating surface, and the old seal condition.
Send clear photos of the failed seal and the cylinder parts when possible. The failure mode often points to the root cause.
For a fast pneumatic seal quotation, send the following data:
If the part is for a pneumatic cylinder repair, also send the cylinder brand and model if available. The model can help identify standard seal kits. CORASEALS will still confirm the dimensions against the drawing before final quotation.
CORASEALS can supply pneumatic cylinder seal kits for standard and custom cylinders. The kit can include piston seals, rod seals, wiper seals, O-rings, backup rings, wear rings, and static gaskets. We assemble each kit according to the cylinder drawing or the customer part list.
Do not rely on a cylinder model code alone. The cylinder model may have multiple bore options, stroke lengths, and seal materials. A drawing with groove dimensions gives the clearest quotation.
1. What pneumatic seals does CORASEALS supply?
CORASEALS supplies pneumatic piston seals, rod seals, wiper seals, scraper seals, O-rings, backup rings, wear rings, guide rings, and pneumatic cylinder seal kits. Custom profiles and dimensions are available.
2. Can CORASEALS make custom pneumatic seals in China?
Yes. Send the groove dimensions, material requirement, operating conditions, drawing, and quantity. CORASEALS will quote custom pneumatic seals according to the drawing.
3. What material should I choose for a pneumatic cylinder rod seal?
The choice depends on air lubrication, temperature, speed, and contamination. NBR is common for oil mist air. Polyurethane is often used for better wear life. FKM may be needed for higher temperature or synthetic oil conditions.
4. What information is required for a pneumatic seal quotation?
Send cylinder bore, rod diameter, groove ID, groove OD, groove width, groove depth, medium, pressure, temperature, speed, material, drawing, sample photo, and quantity.
5. Can CORASEALS supply complete pneumatic cylinder seal kits?
Yes. Send the cylinder model, bore diameter, rod diameter, drawing, and the list of required seal positions. CORASEALS will prepare a kit quotation based on the confirmed dimensions.
If you are looking for a pneumatic seals manufacturer in China, send CORASEALS your seal type, material, ID × OD × width, groove dimensions, operating temperature, pressure, medium, rod speed, drawing, sample photo, and required quantity. We will review the data and return a quotation for standard or custom pneumatic seals.
