Compression molding PTFE rod buffer step seals installation (1600424370857)

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Price:$0.39 - $0.43
Price in USD:Details


Product Overview


Product Description

Compression molding PTFE rod buffer step seals installation

SPNS type hydraulic seals, are also call rod step seals, static seals installed in glands or housings to prevent the leakage of fluid from within a cylinder to the outside as the rod cycles.

SPNS seals can be applied to various applications, especially those occasions where polyurethane seals are not suitable for applications, such as oil in water or emulsion media. PTFE materials have extremely low friction, corrosion resistance and heat resistance compared with other known sealing materials, However, compared with polyurethane and other rubber sealing materials, PTFE is hard and has poor elasticity. In order to make full use of the advantages of PTFE, PTFE must be matched with an expansion ring to supplement elasticity as a seal. At the same time, the PTFE slip ring must be reasonably designed, and the expansion ring must provide sufficient initial sealing force and ensure its static sealing function in the groove.

In order to obtain a good working life, different fillers are added into PTFE. These fillers can greatly improve the deformation resistance of PTFE, increase the wear resistance and reduce the risk of extrusion. Bronze is added to our common PTFE materials.

O-ring is usually used as expansion ring because of its low cost, full size, easy availability and a variety of materials to
choose from. It is very important to select the best expansion ring, because the sealing function of the slip ring depends on the expansion ring, which will greatly affect the working life of the seal. We recommend using SPNS seals if low friction is required.

Diameter: φ8.9-φ500mm

1.Chemical resistance
2. Heat resistance
3. Low friction
4. Has good oil return property
5. Easy installation
6. Longevity

Working Conditions:
●Working Pressure: ≤40Mpa
●Working Temperature:
-30℃ to +110℃
-25℃ to +220℃
Depending on material selected.
●Working Speed: ≤4m/s
●Working Medium:
Hydraulic oil; Gas; Water; etc
PTFE Band: Bronze filled PTFE
O Ring:
NBR, A70±5
FKM, A75±5


Place of Origin
Brand Name
Model Number
Oil cylinder
Diameter: 8.9-500mm
Friction resistance
Working pressure

Main Products

Company Profile

Throughout industrial revolutions, sealing technology is the supportive key factor propelling industrial developments. In the general trend of global industrial upgrading, JST undertakes the mission to fuel social development of mankind via sealing technology.

JST has passed ISO9001 quality management system certification, API Q1 system certification and HSE system certification. JST is dedicated to innovation, and has developed over 40 patented products and counting.

JST keeps increasing production capacity to meet the rising demand from customers. We have rubber seal production workshop, PTFE seal production workshop and tooling processing workshop.

JST's products and services cover construction machinery, oil & gas drilling and stimulation, LNG, aerospace, nuclear & wind power, medical equipment and other industries, and meet the complex and harsh working conditions and technical requirements of various industries with its strength.

We have businesses in more than 30 countries and regions, and established partnerships with top oil service and equipment companies worldwide.

Our Capabilities:
-Rubber Mixing
-Tool Processing
-Billet Molding
-Automatic Molding
Our Strengths:
-Innovative Product Designs
-Manufacturing Excellence
-Sufficient Stock & Fast Delivery
-Over 25 Years of Experience
-Material Testing Capabilities
-Seals Application Testing Capabilities
-Optimized & Advanced Production Processes
-Higher Standard Quality Control System
-Accurate Logistics Control System


Packing & Delivery

Standard packing:
Inner is corrugated paper with film shrinkable.
Outer is carton with film wrapped
*Customized packing available 
Standard export port:
Guangzhou or Shenzhen 
Usually ship by express(such as DHL,UPS, FEDEX, TNT). If the quantity is too big, also can arrange to ship by air or by sea.

T/T (30% deposit, and 70% balance payment paid before shipment)
L/C (for big order)


Q1: Are you trading company or manufacturer?
A: We are manufacturer.

Q2: How long is your delivery time?
A: Generally it takes 3-7 days if we have stock.
Otherwise it takes about 10-15days depending on the qty.

Q3: Can you provide samples? Is it free or extra?
A: Yes, we can supply the sample for free. Freight charges can be negotiated.

Q4: What are your payment terms ?
A: 30% T/T in advance, balance before shipment.

Q5: How soon i can get the quotation?
A: If your information is complete, we offer our quotation within 24 hours.

Q6: Could you supply solutions to us?
A: Sure we can.

Q7: Do you have a minimum order requirement?
A: Small trial order is acceptable.

0.0121 s.