🔧 EPDM Rubber O Ring Seals 4.5mm Cross Section 27mm - 85mm ID BS102-BS125
These premium metric EPDM rubber O-rings feature a 4.5mm cross-section, covering inner diameter sizes from 27mm to 85mm under BS102 to BS125 standard series. Made of solid black EPDM rubber with 70A shore hardness, they deliver stable sealing performance over a wide temperature range and excellent outdoor anti-aging capacity, widely used for automotive, construction, electrical and hydraulic sealing scenarios.
⭐ Main Features & Advantages of 4.5mm Cross Section EPDM O-Rings
- ☀️ Superior Weather Resistance：Excellent ozone resistance, UV shielding and long-term anti-aging performance for long outdoor exposure.
- ⚡ Reliable Electrical Insulation：Strong insulating performance and stable chemical inertness for electrical equipment sealing.
- 🪶 Low Specific Gravity & High Fillability：Light weight, compatible with high filling formulations to reduce costs without sacrificing sealing performance.
- 🌡️ Wide Operating Temperature Range：Maintain stable elasticity from -50°C (-58℉) up to 150°C (302℉).
- 🛡️ 70A Shore Hardness：Moderate hardness with outstanding penetration resistance, balanced compression and rebound elasticity.
- 📏 Complete BS Metric Sizes：4.5mm wire cross-section, inner diameter range 27mm–85mm, conforming to BS102-BS125 standard specifications.
- ⚫ Pure Black EPDM Compound：Uniform color without impurities, consistent sealing effect for long-cycle service.
📊 Complete Technical Specifications
| Measurement Unit | Metric system (mm) |
|---|---|
| Color | Solid Black |
| Raw Material | EPDM (Ethylene Propylene Diene Monomer) Rubber |
| Shore Hardness | 70A Durometer, great penetration resistance |
| Temperature Working Range | -58℉ (-50℃) ~ 302℉ (150℃) |
| Size Definition | Outer Diameter * Inner Diameter * Cross Section (Wire Diameter) |
| Cross Section Wire Size | 4.5mm |
| Inner Diameter Coverage | 27mm ~ 85mm, BS102-BS125 series |
| Core Merits | Ozone, UV & aging resistant; high insulation, stable chemical property |
| Material Limitations | Average oil resistance; poor tolerance to polar solvents and corrosive chemicals |
❓ Frequently Asked Questions
🚗 What equipment can these EPDM O-rings be applied to?
They are widely used for automotive sealing components, building weatherproof gaskets, electrical insulation parts, hydraulic fittings and all kinds of mechanical static & dynamic sealing joints.
🛢️ Are these O-rings suitable for engine oil sealing?
EPDM only has average oil resistance, so it is not recommended for long-term immersion in mineral oil, engine oil and similar oily media. NBR O-rings are more suitable for oil sealing working conditions.
🌧️ Can they be used for outdoor sunlight and water sealing?
Yes. EPDM’s premium UV and ozone resistance effectively prevents cracking and hardening under long-term sunlight, rain and temperature fluctuations, ideal for outdoor pipeline and enclosure sealing.
📌 Important Pre-Purchase & Installation Reminder
Please double-check your required inner diameter, cross-section size and working medium compatibility before ordering. Install the O-ring into the matching groove correctly to avoid premature leakage and damage.
💎 Why Choose Our 4.5mm Cross Section BS Standard EPDM O-Rings?
Our metric EPDM rubber O-rings adopt 70A hardness EPDM raw material with excellent anti-UV, anti-ozone and wide-temperature performance, perfectly matching water-based, outdoor and electrical sealing environments. Covering full BS102-BS125 metric sizes with 4.5mm wire diameter and 27–85mm inner diameter options, these black O-rings provide stable insulation and weatherproof sealing. Please note they are not ideal for heavy oil or strong polar solvent environments; confirm your working medium and dimensions in advance to get a long-lasting reliable sealing solution for automotive, construction and hydraulic equipment.
On 30-Jun-2026 at 15:36:10 BST, seller added the following information: