NBR Bonded Sealing Ring
Tenchy provides custom NBR bonded sealing rings manufactured from extruded nitrile rubber tubing or
cord and joined into continuous circular gaskets. These sealing rings are designed for plastic pail lids,
industrial buckets, drums, containers and other closure systems requiring reliable sealing against liquids,
oils and industrial media.
NBR, also known as nitrile rubber or nitrile butadiene rubber, offers excellent resistance to mineral oils,
lubricants, grease and many petroleum-based fluids. This makes NBR sealing rings particularly suitablez
for packaging used for lubricants, paints, coatings, chemicals and other industrial products.
The sealing ring is produced by extruding NBR rubber to the required profile, cutting it to a controlled
length and joining both ends to form a continuous ring. Solid cord, hollow tubing and customized
extrusion profiles can be produced depending on the sealing groove and compression requirements.
Standard industrial-grade NBR and food-contact grade NBR compounds are available for different
applications. For food and beverage packaging, suitable food-contact materials can be selected
according to the required regulatory standard.
Material Description
• Made from NBR / nitrile butadiene rubber
• Good resistance to mineral oils, lubricants and grease
• Good mechanical strength and abrasion resistance
• Suitable for compression sealing applications
• Available in solid cord and hollow tubing structures
• Bonded or spliced into continuous circular sealing rings
• Typical hardness range: 50–80 Shore A
• 60–70 Shore A is commonly used for industrial sealing applications
• Standard color: black
• Other colors may be available depending on the NBR compound
• Industrial-grade and food-contact grade NBR compounds are available
Main Features
• Excellent resistance to oils, lubricants and grease
• Good sealing performance under compression
• Suitable for industrial pail and bucket lid sealing
• Good resistance to abrasion and repeated mechanical contact
• Good dimensional stability
• Available in solid and hollow cross sections
• Custom ring circumference and diameter available
• Different hardness levels can be selected according to sealing pressure
• Bonded joint can be positioned according to customer requirements
• Suitable for large-volume customized production
• Samples can be produced for lid fitting and sealing evaluation
Physical Properties
Product Type :Bonded / spliced sealing ring
Extrusion Structure :Solid cord, hollow tubing or custom profile
Typical Hardness :50–80 Shore A
Common Hardness :60–70 Shore A
Standard Color :Black
Oil Resistance :Excellent
Lubricant Resistance :Excellent
Water Resistance :Good
Property :Standard Description
Abrasion Resistance :Good
Typical Temperature Range :Approximately -30°C to 100°C, depending on compound and application
Manufacturing Process :Extrusion, cut-to-length, bonding / splicing
Custom Service :Size, hardness, profile, compound, ring length and packaging
Actual physical properties depend on the selected NBR compound and operating conditions.
Bonding and Splicing
The NBR extrusion is cut to the required length and both ends are joined to form a continuous sealing
ring.
Depending on the application, different joining methods can be evaluated:
Adhesive bonding
Cold splicing
Hot splicing
Vulcanized joint
For standard static sealing applications, adhesive-bonded joints can provide a practical and economical
solution.
For applications requiring higher joint strength, higher reliability or special regulatory requirements, hot
spliced or vulcanized joints can also be evaluated.
The joint area can be inspected for:
• Alignment
• Joint strength
• Surface condition
• Diameter consistency
• Flash or excessive adhesive
• Ring circumference
Our Capability and Service
Tenchy has more than 18 years of experience in silicone and rubber sealing products, extrusion products
and custom sealing solutions.
We can provide customized NBR sealing rings according to customer drawings, samples, lid grooves and
application conditions.
Our service includes:
• NBR material selection
• Extrusion profile development
• Solid and hollow tubing production
• Precision cut-to-length
• Bonding and splicing
• Ring circumference control
• Sample development
• Dimensional inspection
• Material and application evaluation
• Custom packaging
• Mass production support
For industrial pail and container projects, our team can help customers evaluate the sealing ring
according to the lid groove, compression requirement, filling material and operating environment.
Samples can be prepared for fitting, compression and sealing tests before mass production.
Applications
NBR bonded sealing rings can be used in:
• Plastic pail lids
• 5-gallon bucket lids
• 18-liter industrial buckets
• 20-liter industrial buckets
• Paint buckets
• Water-based paint containers
• Lubricant buckets
• Grease containers
• Oil containers
• Chemical packaging
• Coating containers
• Adhesive containers
• Industrial drums
• Plastic container closures
• Food ingredient buckets with suitable food-contact NBR
• Beverage additive containers with suitable food-contact NBR
• Flavor and fragrance containers
• Industrial packaging requiring oil-resistant sealing
Quality Inspection
NBR bonded sealing rings can be inspected for:
• Extrusion outer diameter
• Inner diameter and wall thickness for hollow tubing
• Ring circumference
• Hardness
• Joint alignment
• Joint strength
• Surface defects
• Excess adhesive or flash
• Ring deformation
• Assembly fit
Additional material or performance testing can be arranged according to customer requirements.
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