{
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    "generated_at": "2026-05-12T15:36:06+00:00",
    "site": {
        "site_name": "Julong Rubber- Innovative Rubber Solutions for Your Industry Needs",
        "site_url": "https://rubberandseal.com/",
        "company_name": "Julong Rubber",
        "company_email": "info@rubberandseal.com",
        "website": "https://rubberandseal.com/",
        "main_products": [
            "Custom rubber parts",
            "rubber gaskets",
            "rubber seals",
            "rubber wheels",
            "rubber hoses",
            "EPDM HVAC gaskets",
            "silicone rubber parts",
            "molded rubber components",
            "rubber-to-metal bonded parts"
        ],
        "main_markets": [
            "Germany",
            "France",
            "Netherlands",
            "Sweden",
            "United Kingdom",
            "European Union",
            "United States",
            "HVAC manufacturers",
            "industrial B2B buyers",
            "rubber product distributors"
        ]
    },
    "article": {
        "id": 8607,
        "post_type": "post",
        "title": "What Is the Difference Between 70 and 90 O-Rings?",
        "url": "https://rubberandseal.com/difference-between-70-and-90-o-rings/",
        "agent_json_url": "https://rubberandseal.com/difference-between-70-and-90-o-rings/agent.json",
        "agent_markdown_url": "https://rubberandseal.com/difference-between-70-and-90-o-rings/agent.md",
        "published_at": "2025-05-08T11:28:10+00:00",
        "modified_at": "2025-05-08T11:28:10+00:00",
        "excerpt": "Confused about whether to choose a 70 or 90 O-ring for your project? Using the wrong hardness can lead to leaks, extrusion, or premature failure. The main difference between 70 and 90 O-rings is hardness. A 70-durometer O-ring is softer and more flexible, while a…",
        "categories": [
            "Product-Related"
        ],
        "tags": [],
        "headings": [
            {
                "level": 2,
                "text": "What Does “Durometer” Mean in O-Rings?"
            },
            {
                "level": 3,
                "text": "✅ Key Shore A Hardness Reference:"
            },
            {
                "level": 2,
                "text": "70 Durometer O-Rings: Why They're Most Common"
            },
            {
                "level": 3,
                "text": "✅ Benefits of 70A O-Rings:"
            },
            {
                "level": 3,
                "text": "✅ Ideal For:"
            },
            {
                "level": 2,
                "text": "90 Durometer O-Rings: When to Choose Harder Rubber"
            },
            {
                "level": 3,
                "text": "✅ Benefits of 90A O-Rings:"
            },
            {
                "level": 3,
                "text": "✅ Ideal For:"
            },
            {
                "level": 2,
                "text": "70 vs 90 O-Rings: Performance Comparison"
            },
            {
                "level": 2,
                "text": "Which Durometer Should You Choose?"
            },
            {
                "level": 3,
                "text": "✅ Choose 70 Durometer10 When:"
            },
            {
                "level": 3,
                "text": "✅ Choose 90 Durometer11 When:"
            },
            {
                "level": 2,
                "text": "Conclusion"
            }
        ],
        "content_text": "Confused about whether to choose a 70 or 90 O-ring for your project? Using the wrong hardness can lead to leaks, extrusion, or premature failure. The main difference between 70 and 90 O-rings is hardness. A 70-durometer O-ring is softer and more flexible, while a 90-durometer O-ring is harder and more resistant to extrusion under pressure. 70 vs 90 durometer O-ring Let’s explore how these hardness levels affect sealing performance, durability, and ideal use cases. What Does “Durometer” Mean in O-Rings? Not sure what the numbers 70 or 90 actually refer to? Durometer measures the hardness of rubber on the Shore A scale. A higher number means a harder material. 70A is standard for most O-rings, while 90A is for high-pressure or high-wear environments. ✅ Key Shore A Hardness Reference: Durometer1 Feel (Touch) Flexibility2 Typical Use 40A Very soft (gel-like) Very flexible Low-pressure static seals 70A Medium firmness ✅ Good flexibility Standard O-ring3 for most uses 90A Very firm ✅ Low flexibility High-pressure hydraulic/pneumatics 70 Durometer O-Rings: Why They're Most Common Looking for a general-purpose seal? 70A durometer O-rings are the industry standard for most sealing applications due to their balance of flexibility, compression set resistance, and media compatibility. 70A standard O-rings ✅ Benefits of 70A O-Rings: Easy to compress into sealing grooves Good sealing with low to moderate pressure4 Ideal for static and slow-moving dynamic seals5 Cost-effective and widely available6 Available in materials like NBR, FKM, EPDM, HNBR, Silicone ✅ Ideal For: Plumbing fittings HVAC systems Automotive fuel and oil lines Water-resistant enclosures General-purpose hydraulic seals 90 Durometer O-Rings: When to Choose Harder Rubber Need a seal that won’t get extruded under high pressure? 90A durometer O-rings are stiffer and stronger, making them suitable for high-pressure environments where extrusion or deformation is a concern. ✅ Benefits of 90A O-Rings: High resistance to extrusion7 Better wear and abrasion resistance Good dimensional stability under load8 Less prone to rolling or distortion in dynamic applications ✅ Ideal For: Hydraulic cylinders and pistons High-pressure valve stems Pneumatic actuators Heavy machinery and industrial systems ⚠️ Note: They require more compression force and are less forgiving in poorly machined grooves. 70 vs 90 O-Rings: Performance Comparison Here’s a quick look at how the two durometers differ across key performance factors. Property 70 Durometer ✅ 90 Durometer ✅ Hardness (Shore A) Medium High Flexibility Good ✅ Low ⚠️ Extrusion Resistance Moderate ⚠️ Excellent ✅ Compression Force Needed Low ✅ High ⚠️ Best For General sealing High-pressure sealing9 Groove Fill/Conformity Better ✅ Stiffer ⚠️ Which Durometer Should You Choose? Not sure which is right for your application? ✅ Choose 70 Durometer10 When: Dealing with static or slow-moving parts Groove dimensions may vary Sealing low to moderate pressure fluids You need a flexible, easy-to-install seal ✅ Choose 90 Durometer11 When: Operating in high-pressure hydraulic or pneumatic systems Extrusion risk is high (wide gaps, sharp edges) Wear resistance is critical The seal is exposed to repetitive movement or pressure spikes Conclusion 70-durometer O-rings are the best choice for most standard sealing needs, offering flexibility and sealing efficiency. 90-durometer O-rings are ideal for high-pressure, high-wear environments where extrusion resistance matters most. Always match hardness with pressure, fluid, and application conditions. 🔧 Need Help Choosing the Right O-Ring Hardness? Contact Julong Rubber or Request a Quote for custom durometer O-rings made to fit your specifications. Or message us now via WhatsApp: Understanding Durometer is essential for selecting the right material for your project. Explore this link for detailed insights. ↩ Flexibility is a key factor in material performance. Discover more about its importance in engineering applications. ↩ O-rings are crucial in sealing applications. Learn more about their uses and benefits in various industries. ↩ Understanding the advantages of effective sealing can enhance your application of O-Rings in various systems. ↩ Learning about the specific applications of O-Rings can optimize their use in your engineering designs. ↩ Exploring this topic can help you make informed decisions about O-Ring selection for your projects. ↩ Understanding the benefits of high extrusion resistance can help you choose the right O-Rings for your applications. ↩ Explore why dimensional stability is crucial for O-Rings to ensure reliable performance in various applications. ↩ Learn about the advantages of using 90 durometer O-Rings for high-pressure sealing to enhance your system's efficiency. ↩ Explore this link to understand the specific applications and benefits of using 70 Durometer seals in various scenarios. ↩ Discover the advantages of 90 Durometer seals, especially in high-pressure environments, to enhance your sealing solutions. ↩",
        "content_markdown": "# What Is the Difference Between 70 and 90 O-Rings?\n\nConfused about whether to choose a 70 or 90 O-ring for your project? Using the wrong hardness can lead to leaks, extrusion, or premature failure. The main difference between 70 and 90 O-rings is hardness. A 70-durometer O-ring is softer and more flexible, while a 90-durometer O-ring is harder and more resistant to extrusion under pressure. 70 vs 90 durometer O-ring Let’s explore how these hardness levels affect sealing performance, durability, and ideal use cases. What Does “Durometer” Mean in O-Rings? Not sure what the numbers 70 or 90 actually refer to? Durometer measures the hardness of rubber on the Shore A scale. A higher number means a harder material. 70A is standard for most O-rings, while 90A is for high-pressure or high-wear environments. ✅ Key Shore A Hardness Reference: Durometer1 Feel (Touch) Flexibility2 Typical Use 40A Very soft (gel-like) Very flexible Low-pressure static seals 70A Medium firmness ✅ Good flexibility Standard O-ring3 for most uses 90A Very firm ✅ Low flexibility High-pressure hydraulic/pneumatics 70 Durometer O-Rings: Why They're Most Common Looking for a general-purpose seal? 70A durometer O-rings are the industry standard for most sealing applications due to their balance of flexibility, compression set resistance, and media compatibility. 70A standard O-rings ✅ Benefits of 70A O-Rings: Easy to compress into sealing grooves Good sealing with low to moderate pressure4 Ideal for static and slow-moving dynamic seals5 Cost-effective and widely available6 Available in materials like NBR, FKM, EPDM, HNBR, Silicone ✅ Ideal For: Plumbing fittings HVAC systems Automotive fuel and oil lines Water-resistant enclosures General-purpose hydraulic seals 90 Durometer O-Rings: When to Choose Harder Rubber Need a seal that won’t get extruded under high pressure? 90A durometer O-rings are stiffer and stronger, making them suitable for high-pressure environments where extrusion or deformation is a concern. ✅ Benefits of 90A O-Rings: High resistance to extrusion7 Better wear and abrasion resistance Good dimensional stability under load8 Less prone to rolling or distortion in dynamic applications ✅ Ideal For: Hydraulic cylinders and pistons High-pressure valve stems Pneumatic actuators Heavy machinery and industrial systems ⚠️ Note: They require more compression force and are less forgiving in poorly machined grooves. 70 vs 90 O-Rings: Performance Comparison Here’s a quick look at how the two durometers differ across key performance factors. Property 70 Durometer ✅ 90 Durometer ✅ Hardness (Shore A) Medium High Flexibility Good ✅ Low ⚠️ Extrusion Resistance Moderate ⚠️ Excellent ✅ Compression Force Needed Low ✅ High ⚠️ Best For General sealing High-pressure sealing9 Groove Fill/Conformity Better ✅ Stiffer ⚠️ Which Durometer Should You Choose? Not sure which is right for your application? ✅ Choose 70 Durometer10 When: Dealing with static or slow-moving parts Groove dimensions may vary Sealing low to moderate pressure fluids You need a flexible, easy-to-install seal ✅ Choose 90 Durometer11 When: Operating in high-pressure hydraulic or pneumatic systems Extrusion risk is high (wide gaps, sharp edges) Wear resistance is critical The seal is exposed to repetitive movement or pressure spikes Conclusion 70-durometer O-rings are the best choice for most standard sealing needs, offering flexibility and sealing efficiency. 90-durometer O-rings are ideal for high-pressure, high-wear environments where extrusion resistance matters most. Always match hardness with pressure, fluid, and application conditions. 🔧 Need Help Choosing the Right O-Ring Hardness? Contact Julong Rubber or Request a Quote for custom durometer O-rings made to fit your specifications. Or message us now via WhatsApp: Understanding Durometer is essential for selecting the right material for your project. Explore this link for detailed insights. ↩ Flexibility is a key factor in material performance. Discover more about its importance in engineering applications. ↩ O-rings are crucial in sealing applications. Learn more about their uses and benefits in various industries. ↩ Understanding the advantages of effective sealing can enhance your application of O-Rings in various systems. ↩ Learning about the specific applications of O-Rings can optimize their use in your engineering designs. ↩ Exploring this topic can help you make informed decisions about O-Ring selection for your projects. ↩ Understanding the benefits of high extrusion resistance can help you choose the right O-Rings for your applications. ↩ Explore why dimensional stability is crucial for O-Rings to ensure reliable performance in various applications. ↩ Learn about the advantages of using 90 durometer O-Rings for high-pressure sealing to enhance your system's efficiency. ↩ Explore this link to understand the specific applications and benefits of using 70 Durometer seals in various scenarios. ↩ Discover the advantages of 90 Durometer seals, especially in high-pressure environments, to enhance your sealing solutions. ↩"
    },
    "agent_guidance": {
        "notice": "This article package helps search engines and AI agents understand the article structure, B2B manufacturing context, product capabilities, and company information. For real inquiries, please contact Julong Rubber by email or through the website contact form.",
        "rfq_note": "This endpoint is not a quotation system. For real inquiries, use the website contact form or company email."
    }
}