{"id":14134,"date":"2026-08-31T11:49:55","date_gmt":"2026-08-31T09:49:55","guid":{"rendered":"https:\/\/jaequas.com\/?page_id=14134"},"modified":"2026-09-04T08:34:59","modified_gmt":"2026-09-04T06:34:59","slug":"miert-eppen-a-vulkanizalt-gumi","status":"publish","type":"page","link":"https:\/\/jaequas.com\/hu\/why-vulcanized-rubber\/","title":{"rendered":"Mi\u00e9rt \u00e9ppen a vulkaniz\u00e1lt gumi?"},"content":{"rendered":"\t\t
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Material knowledge<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Why Vulcanized Rubber for Water and Pipeline Sealing?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t
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A gasket does not prove its quality at the moment of installation. The real question is how the material behaves after repeated compression, temperature changes, pressure variation, ageing and exposure to the actual medium.<\/p>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Discuss Your Application<\/a>View Sealing Products<\/a><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Cross-section\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Why vulcanized rubber?<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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We like 1980s durability<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Remember when you had to replace the tap sooner than the gasket?<\/strong><\/p>

Planning for the long term with a rubber seal? Then our quick comparison table is worth a look. (General industry data — deviations may occur!)<\/strong><\/p>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Property
(installed under compression, as a water seal)<\/span><\/th>		Extruded rubber
market average<\/span><\/th>		TPE
market average<\/span><\/th>		Vulcanized rubber
JAEQUAS<\/span><\/th><\/tr><\/thead>
Compression set
(After installation, what percentage of the compressed material is lost for good — the rest never springs back.)<\/span><\/strong><\/td>		40–55%<\/td>35–50%<\/td>10–14%<\/strong><\/td><\/tr>
Tensile strength<\/strong><\/td>5–8 MPa<\/td>5–15 MPa<\/td>14 MPa<\/strong><\/td><\/tr>
Elongation at break<\/strong><\/td>150–250%<\/td>200–400%<\/td>300%<\/strong><\/td><\/tr>
Density<\/strong><\/td>1.10–1.20 g\/cm³<\/td>0.90–1.10 g\/cm³<\/td>1.23 g\/cm³<\/strong><\/td><\/tr>
Continuous temperature resistance — SBR<\/strong><\/td>−28°C \/ +76°C<\/td>max. approx. +50°C<\/td>−40°C \/ +70°C<\/strong><\/td><\/tr>
Continuous temperature resistance — EPDM<\/strong><\/td>−30°C \/ +100°C<\/td>max. approx. +130°C (TPV!)<\/td>−40°C \/ +130°C<\/strong><\/td><\/tr>
Elasticity after ageing<\/strong><\/td>Deteriorates<\/td>Deteriorates<\/td>Remains stable<\/strong><\/td><\/tr>
Standard compliance<\/strong><\/td>?<\/td>?<\/td>EN 681-1 ✔<\/strong><\/td><\/tr>
Potable-water certification<\/strong><\/td>?<\/td>?<\/td>Hungarian potable-water approval<\/strong><\/td><\/tr>
Service life at around 30 °C<\/strong><\/td>5–10 years<\/td>3–5 years<\/td>10–30 years<\/strong><\/td><\/tr>
Service life at around 70 °C<\/strong><\/td>2–4 years<\/td>1–2 years<\/td>10–30 years<\/strong><\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Rubber is not just rubber<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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For years people have been asking the same question when they first meet a vulcanized rubber seal: “What is the difference? Rubber is rubber.” That single sentence is the reason a repair only works in the short term — because before long you are back with dripping taps, leaks and gaskets that have slid out of place, again and again.<\/p>

Not all rubber is the same. And that is not marketing copy — that is physics.<\/p>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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What happens to a gasket after it is pushed in?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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When a gasket is clamped \u2014 whether in a tap, a hose coupling or a flange \u2014 the rubber is put under compression. The question is not whether it seals in the first moment. Of course it seals. The question is what it does after six months, two years, five years, ten years.<\/strong><\/p>

Extruded or pressed rubber gaskets \u2014 the kind you find in most cheap assortment boxes \u2014 do not go through a vulcanization process during manufacture. The molecular structure of the material is loosely connected, without crosslinks. The result: a material that looks and feels like rubber, but behaves closer to a plastic.<\/p>

Vulcanized rubber, by contrast, goes through heat treatment and a sulphur crosslinking process.<\/strong> The molecules form a tightly connected network \u2014 not simply pressed together, but chemically bonded. This is the difference that takes the service life of a seal from 3\u20135 years to 10\u201330 years.<\/p>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Compression set — the thing nobody tells you about<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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There is one figure most distributors carefully avoid in the product description: compression set<\/strong>, the permanent deformation. It measures how far the material returns to its original thickness after sustained compression.<\/p>

A simple example: you compress the gasket to 3 mm. Two years later — after temperature swings, pressure pulses and chemical exposure — the material springs back to only 1.8 mm. The remaining 1.2 mm is lost. That is why the tap starts to drip: it does not spring back into “its place”.<\/p>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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