AS568-231 Buna/NBR O-Rings, 90 Shore A — Oilfield Gland Replacement
AS568-231 gland-fit review
Send the gland drawing, fluid designation and pressure cycle for selection of the specified 90 Shore A NBR compound.
Application
Applications of NBR O-Rings and Buna O-Rings:
Buna and NBR are names for the nitrile rubber material family. This AS568-231 listing specifies nominal 90 Shore A hardness for oilfield replacement enquiries. Compound selection still depends on the exact fluid, additives and operating temperature. Include pressure peaks, gland clearance and seal squeeze; the material name and hardness alone do not establish a pressure rating.
Qinuo Equipment list:
| 20 Cavities Rounding Comounding Machines |
Automatic Powder Distribution Machine |
Automatic Oil Distribution Machine |
8 Sets of Open Cell Mixers
( From 6 inches to 16 inches) |
5 Layers of Material Cooling Machine |
3 Sets of 55kq Closed Cell Mixers |
| 2 Sets of Material Preform Machine |
3 Sets of Silicone Vacuum Mixer |
65 mm Diameter Silicone Extrusion Line |
| JG-65mm Diameter Silicone Extrusion Line |
75mm Diameter Silicone Extrusion Line |
90 mm Diameter General Rubber
Extrusion Line |
75mm Diameter General
Rubber Extrusion Line |
Fiber Reinforced Rubber Extrusion Line |
Vulcanizing Tank |
| Adhesive Machin |
28 Sets of Small Vulcanizing Molding Machines(From 50Ton to 100 Tons) |
25 Sets of 200 Ton Vulcanizing
Molding Machine |
4 Sets of 200 Ton Injection
Compression Machine |
2 Sets of 200 Ton Vacumm
Compression Machine |
2 Sets of 250 Ton Vulcanizing
Molding Machine |
2 Sets of Horizontal Molding Machine |
4 Sets of 300 Ton Vulcanizing
Molding Machine |
2 Sets of 300 Ton Injection
Compression Machine |
Punching Machine |
Tensile Strength Tester |
| Brittleness Tester |
Hardness Tester |
Thickness Gauge |
| Mooney viscometer |
Rheometer Tester |
Analytical Balance |
| Electrical Resistance Measurer |
Density Tester |
2 sets Aging Testing Oven |
Qinuo Material processing range:
Silicone
|
SBR |
ACM |
PE |
| EPDM |
NBR |
IIR |
PC |
| Neoprene |
Silicone Sponge |
CSM |
PP |
| Urethane |
Closed Cell Sponge |
ABS |
PA |
| |
HNBR |
Hard PVC |
TPE |
| NR |
ECO |
Soft pvc |
TPV |
| POM |
TPU |
|
|
Qinuo Custom Capabilties:
| Customized services |
Plastic & Rubber bonding |
Mold Design |
| Customized extrusion |
Extrusion and bonded gaskets |
Mold Production |
| Injection Molding |
Self Adhesive rubber profile |
Customized Package |
| Sheet Cutting |
Rubber Complex Intake Hose |
Problem Solving |
| Standard Size extrusion |
Reinforced rubber tubes |
Assembly |
| Special Compound design |
Rubber Solution Suggestion |
Sourcing |
| Rubber& Metal bonding |
Product Description
Specify AS568-231 with the required NBR compound, nominal 90 Shore A hardness, hardness tolerance and dimensional acceptance requirements. A worn sample can assist identification but should be checked against the original gland drawing.
The 3-3/8 inch wording is a rounded size reference. Confirm ring inner diameter and circular cross-section from the applicable AS568-231 dimensions and tolerances; do not machine a gland from the rounded label alone.
NBR is the material reference for this item. FKM, EPDM, silicone or HNBR substitutions require separate compatibility and gland reviews rather than being assumed equivalent.
|
Material:
|
Buna/NBR; exact compound and fluid compatibility to be specified
|
|
Hardness
|
Nominal 90 Shore A; tolerance by approved compound specification
|
|
Mode of Production
|
Molded continuous O-ring; joined cord loops require separate joint and leakage specifications
|
|
Production review
|
Tooling, compound and inspection plan reviewed for the AS568-231 item
|
|
Size/Color
|
AS568-231 circular-section O-ring; color and tolerances by approved order
|
More Pictures of the rubber O rings:
Other relative rubber products for oil drilling use:
Moulded Rubber Products
Rubber Bonded with Metal Products
Extruded Rubber Products
Packing and shipping
1: Express: S.F. ,DHL,UPS, TNT, FedEx ect, for urgent and small order.
2: Air shipment: air port to air port , or air port to door.
3: Sea shipment: suitable for bulk goods. it will takes more longer time than air shipment.
Our company
Shanghai Qinuo Industry Co. Ltd
provides custom rubber, plastic and machined parts for industrial applications.
For oilfield gland replacement, specify the NBR compound together with dimensions, hardness and service conditions.
Provide the gland drawing and inspection requirements for production review.
The company operates an ISO 9001 quality management system. Request product-specific batch and test documentation as required by the order.
The steps of the production:
FAQ
1. Is 3-3/8 inch enough to order this ring?
Use AS568-231 together with the required dimensions and tolerances. The rounded inch label alone does not define the complete ring geometry.
Check the gland drawing and circular cross-section; nominal pipe size or an estimated sample diameter is insufficient.
2. What does 90 Shore A tell the buyer?
a. It identifies nominal hardness, subject to the specified test and tolerance.
b. It does not identify the exact NBR compound formulation.
c. Hardness affects compression and installation force.
d. Extrusion resistance also depends on clearance and temperature.
e. Compression-set requirements need compound data.
f. Dynamic use requires motion and lubrication information.
g. Confirm installation conditions before choosing an alternative hardness.
3. Can the ring be used at any oilfield pressure?
1. Specify maximum pressure and transient peaks.
2. Provide gland clearance under load and temperature.
3. Review seal squeeze and groove fill against the design.
4. Specify backup-ring placement where required by the assembly.
5. Qualify the complete assembly; this listing gives no independent pressure rating.
4. What information is required for a replacement enquiry?
1. AS568-231 and the applicable drawing revision
2. NBR compound designation, 90 Shore A nominal hardness and tolerance
3. Fluid formulation, additives and cleaning chemicals
4. Operating temperatures, pressure cycles and gland dimensions
5. Quantity, package identification and batch-document requirements
More information about AS568-231 Buna/NBR O-Rings, 90 Shore A — Drawing and Compound Review
Send the original drawing or sample with the required compound and service conditions.
Welcome to contact us for more information.
www.unionseal.com
Your message must be between 20-3,000 characters!
