90mm O Ring Silicone Rubber OEM Manufacturing

The 90mm o ring is a widely used sealing component in industrial systems, offering reliable performance in applications ranging from hydraulics and automotive to food processing and heavy machinery. Whether you are sourcing a standard o ring 90mm or specifying a custom-engineered seal, understanding technical parameters such as material properties, dimensional standards, and tolerance control is essential.

What Is a 90mm O Ring?

A 90mm rubber o ring is a circular elastomer seal with an inner diameter (ID) of 90 mm, designed to prevent leakage between two surfaces under compression.

Basic Structure

Parameter	Description
Inner Diameter (ID)	90 mm
Cross Section (CS)	Varies (e.g., 2mm, 3mm, 5mm, etc.)
Outer Diameter (OD)	ID + (2 × CS)
Material	Silicone, NBR, EPDM, FKM, etc.
Application	Static or dynamic sealing

Standard Dimensions for 90mm O Ring

O-rings follow international standards to ensure compatibility across equipment. Below are common cross-section sizes applicable to o ring 90mm.

Cross-Section Standard Table

Standard	Cross Section Sizes (mm)
AS568 (USA)	1.78 · 2.62 · 3.53 · 5.33 · 6.99
ISO 3601	1.80 · 2.65 · 3.55 · 5.30 · 7.00
JIS B 2401	1.90 · 2.40 · 3.10 · 3.50 · 5.70
BS1516	1.90 · 2.40 · 3.10 · 3.50 · 5.70
Metric	1.00 → 20.00

Example Dimensions for 90mm O Ring

ID (mm)	CS (mm)	OD (mm)
90	2	94
90	3	96
90	5	100
90	6	102
90	7	104

Tolerance Standards (ISO 3601)

Dimension	Tolerance
ID ≤ 100 mm	±0.10 to ±0.25 mm
CS ≤ 3.5 mm	±0.08 mm
CS > 3.5 mm	±0.10 mm

High-precision applications require strict adherence to these tolerances for sealing integrity.

O-Ring Materials: Technical Comparison

Material selection determines performance under temperature, pressure, and chemical exposure.

Material Comparison Table

Material	Temp Range	Chemical Resistance	Hardness (Shore A)	Typical Use
NBR	-40°C to +120°C	Oil, fuel	60–90	Automotive, hydraulics
Silicone (VMQ)	-60°C to +230°C	Moderate	40–80	Food, medical
EPDM	-50°C to +150°C	Water, steam	50–90	HVAC, plumbing
FKM (Viton)	-20°C to +250°C	Excellent	60–90	Chemical, aerospace
HNBR	-40°C to +150°C	High	60–90	Industrial systems

Silicone O-Ring Properties

Silicone is widely used for 90mm rubber o ring in food and medical industries:

• High thermal stability

• Non-toxic and FDA compliant

• Flexible at low temperatures

• Excellent aging resistance

Mechanical Properties & Performance Data

Typical Mechanical Properties

Property	Range
Tensile Strength	7–15 MPa
Elongation at Break	150–600%
Compression Set	10–40%
Hardness	40–90 Shore A

Compression & Sealing Performance

Compression Ratio	Performance
10–15%	Low sealing force
20–30%	Optimal sealing
>30%	Risk of damage

 

Applications of 90mm O Ring

The 90 mm o ring is widely used across industries:

Industrial Applications

• Hydraulic cylinders

• Pumps and valves

• Pneumatic systems

Automotive

• Engine sealing

• Fuel systems

• Cooling systems

Food & Medical

• Food-grade processing equipment

• Medical devices

• Pharmaceutical systems

Heavy Equipment

• Mining machinery

• Construction equipment

• Oil & gas systems

Quality Standards & Certifications

International Standards

Standard	Purpose
ISO 3601	O-ring dimensions and tolerances
ASTM D2000	Material classification
DIN 3771	German industrial standard
JIS B 2401	Japanese standard

 

Food & Medical Certifications

Certification	Application
FDA	Food contact
LFGB	European food safety
USP Class VI	Medical grade
RoHS	Environmental compliance

 

Groove Design for 90mm O Ring

Proper groove design ensures sealing efficiency.

Groove Dimensions

Parameter	Recommendation
Groove Depth	75–85% of CS
Groove Width	CS × 1.5
Surface Finish	Ra ≤ 0.8 µm

Clearance & Extrusion Control

Pressure Level	Recommendation
Low	Standard groove
Medium	Tight clearance
High	Use backup ring

Manufacturing Process of O-Rings (Detailed Technical Overview)

 

The manufacturing of a high-quality 90mm o ring requires strict control at every stage to ensure dimensional accuracy, material consistency, and sealing performance. Below is a more in-depth explanation of each production step:

1. Material Mixing (Compounding)

This is the foundation of O-ring quality. Raw elastomers are blended with additives to achieve the desired properties.

Key components include:

• Base polymer (NBR, Silicone, EPDM, FKM)

• Fillers (carbon black, silica)

• Plasticizers and processing aids

• Vulcanizing agents (sulfur or peroxide)

• Color pigments

Technical considerations:

• Uniform dispersion ensures consistent hardness and strength

• Mixing is typically done using Banbury mixers or two-roll mills

• Precise formulation affects temperature resistance, elasticity, and chemical compatibility

2. Compression or Injection Molding

The compounded material is shaped into O-rings using molds.

Compression Molding

• Material is placed into a heated mold cavity

• Pressure is applied to shape the O-ring

• Suitable for standard sizes like o ring 90mm

Injection Molding

• Material is injected into closed molds under high pressure

• Ideal for high-volume and precision products

Technical notes:

• Mold design directly affects dimensional tolerance

• Multi-cavity molds improve production efficiency

3. Vulcanization (Curing)

Vulcanization is the chemical process that transforms soft rubber into a durable, elastic material.

Process details:

• Heat activates cross-linking between polymer chains

• Typical temperature: 150°C – 200°C

• Time depends on material and thickness

Benefits:

• Improves elasticity and strength

• Enhances heat and chemical resistance

• Stabilizes shape and dimensions

4. Post-Curing

Post-curing is especially important for high-performance and food-grade O-rings.

Purpose:

• Removes volatile substances and residual chemicals

• Improves compression set and long-term stability

Typical conditions:

• 200°C for 2–24 hours depending on material

This step is critical for applications requiring FDA or medical compliance.

5. Trimming and Finishing

After molding, excess material (flash) must be removed.

Methods include:

• Manual trimming

• Cryogenic deflashing (freezing and tumbling)

• Precision cutting

Additional finishing processes:

• Surface polishing

• Lubrication coating

• Marking or labeling

6. Inspection & Quality Control

Final inspection ensures the o ring meets all specifications.

Inspection parameters:

• Dimensional accuracy (ID, CS, OD)

• Hardness (Shore A)

• Surface defects

• Mechanical properties

Testing equipment:

• Optical measuring systems

• Tensile testing machines

• Compression set testers

Manufacturing Methods (Technical Comparison)

Different production methods are used depending on design complexity, volume, and precision requirements.

Method	Application	Advantages	Limitations
Compression Molding	Standard O-rings	Cost-effective, simple tooling	Lower precision vs injection
Injection Molding	High precision O-rings	High accuracy, automation, consistency	Higher tooling cost
Transfer Molding	Complex shapes	Better flow control, suitable for inserts	More complex process

• Use compression molding for standard products like 90mm rubber o ring in medium volumes

• Choose injection molding for high-precision, high-volume production

• Select transfer molding for complex geometries or insert-molded components

The quality of an O-ring is directly tied to its manufacturing process. From material mixing to final inspection, every step must be carefully controlled to ensure that products like o ring 90mm deliver reliable sealing performance in demanding applications.

Accuracy & Quality Control

Testing Equipment

• Hardness tester (Shore A)

• Tensile testing machine

• Compression set tester

• Thermal aging oven

Inspection Process

Stage	Control
Incoming Material	Chemical composition
In-Process	Dimensional check
Final Inspection	Performance testing

OEM Manufacturing for 90mm Rubber O Ring

Custom manufacturing allows:

• Non-standard sizes

• Custom materials

• Branding and packaging

OEM Process Table

Step	Description
Design	CAD & specification
Tooling	Mold fabrication
Production	Mass manufacturing
QC	Testing & inspection
Delivery	Global shipping

MINH FAST – Global OEM O-Ring Manufacturer

For businesses seeking reliable OEM production, MINH FAST is a trusted partner specializing in silicone and rubber O-rings.

Website: https://vietnamsiliconerubber.com/

The 90mm o ring is a critical sealing component used in a wide range of industries. From selecting the right material to ensuring dimensional accuracy and compliance with international standards, every detail plays a role in performance.

Whether you need a standard 90 mm o ring or a custom 90mm rubber o ring, working with a qualified OEM manufacturer ensures reliability, durability, and cost efficiency.

For global sourcing and custom solutions, MINH FAST provides high-quality manufacturing with international delivery—making it an ideal partner for your sealing needs.

See more: O Ring 30mm Silicone Rubber OEM Manufacturing

Certification

Packaging & Shipping

 

 

MINH FAST COMPANY LIMITED

Head office: No. 1/19 Luong Khanh Thien Street, Tuong Mai Ward, Hanoi city, Vietnam.
Phone/zalo/whatsapp: 0084.8899.14599
Email1: Thamsiliconetkv@gmail.com    
Email2: Minhfastsales@gmail.com