{"id":165632,"date":"2022-08-18T15:37:40","date_gmt":"2022-08-18T07:37:40","guid":{"rendered":"https:\/\/facfox.com\/docs\/?post_type=kb&p=165632"},"modified":"2022-09-01T17:48:32","modified_gmt":"2022-09-01T09:48:32","slug":"whats-the-difference-between-polyurethane-rubber-pu-and-silicone-rubber","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/whats-the-difference-between-polyurethane-rubber-pu-and-silicone-rubber","title":{"rendered":"What’s the Difference between Polyurethane Rubber (PU) and Silicone Rubber?"},"content":{"rendered":"

Silicone and polyurethane are both commonly used materials for o-rings, gaskets, seals, tubing, and membranes. While both elastomers may be used to create similar products, the specific application and environment will ultimately determine whether polyurethane or silicone will be the better choice for you.<\/p>\n

The table below summarises some of the key differences between the two materials.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Polyurethane<\/b><\/td>\nSilicone<\/b><\/td>\n<\/tr>\n
-50 \u00b0C to 80 \u00b0C<\/td>\n-50 \u00b0C to 230 \u00b0C<\/td>\n<\/tr>\n
Very good compression set<\/td>\nExcellent compression set<\/td>\n<\/tr>\n
Good weather resistance<\/td>\nExcellent weather resistance<\/td>\n<\/tr>\n
Approx. tensile strength 25 MPa<\/td>\nApprox. tensile strength 5 MPa<\/td>\n<\/tr>\n
Excellent abrasion resistance<\/td>\nPoor abrasion resistance<\/td>\n<\/tr>\n
Not compatible with:<\/b> alkalis and acids, aromatic and oxygenated solvents, brake fluids, and alcohols.<\/td>\nNot compatible with:<\/b> hydrocarbon fuels, alkalis and acids, steam over 121 \u00b0C, trichloroethylene, and aromatic hydrocarbons.<\/td>\n<\/tr>\n
Compatible with:<\/b> most oils and fuels, cold water, salt water, and metal salts.<\/td>\nCompatible with:<\/b> oils, brake fluids, hot and cold water, salt water, high molecular weight chlorinated hydrocarbons, fire-resistant hydraulic fluid, and ozone.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Both polyurethane and silicone can operate at extremely low temperatures, although silicone is a far better option in high-temperature environments. Silicone can resist intermittent temperatures of up to 230\u00b0C, or up to 280\u00b0C if a heat stabilizer is added to the raw material. In contrast, polyurethane will start to degrade at 80\u00b0C which is not ideal for any high-temperature environments.<\/p>\n

\"\"
Cast urethane & polyurethane rubber<\/figcaption><\/figure>\n
\"\"
Cast polyurethane rubber<\/figcaption><\/figure>\n

Polyurethane has excellent tensile strength and great abrasion resistance, whereas silicone has good tensile strength, but poor abrasion resistance. For dynamic applications subject to friction and wear, polyurethane would most likely be a better option. The durability of polyurethane parts is why it is the industry standard for skateboard and forklift wheels. With this being said, silicone can be formulated to have improved tear strength, making it an ideal choice for applications such as vacuum sheeting and peristaltic pumps. Silicone also has a superior compression set, which makes it a better choice for applications requiring a long-lasting, reusable seal, especially in high-temperature environments.<\/p>\n

\"\"
Cast silicone rubber<\/figcaption><\/figure>\n
\"\"
Cast silicone rubber<\/figcaption><\/figure>\n

While silicone has excellent resistance to ozone and UV, polyurethane does not have the best resistance to ozone and UV, making silicone more viable for most outdoor applications. However, polyurethane is resistant to most forms of fuels and oils, whereas silicone is not compatible with a lot of hydrocarbon fuels. With this in mind, polyurethane would be the superior choice for the automotive industry, although fluorosilicone compounds can be a good fuel-resistant alternative if a silicone-based material is required.<\/p>\n

It is clear to see that there is merit in using either polyurethane and silicone, depending on what physical properties you require and the operational environment. For help selecting material for your application, consult our\u00a0applications page<\/a>\u00a0and\u00a0contact us<\/a>\u00a0with any questions.<\/p>\n

 <\/p>\n

Source: Jehbco Silicones<\/p>\n","protected":false},"excerpt":{"rendered":"

Silicone and polyurethane are both commonly used materials for o-rings, gaskets, seals, tubing, and membranes. While both elastomers may be used to create similar products, the specific application and environment will ultimately determine whether polyurethane or silicone will be the better choice for you. The table below summarises some of the key differences between the […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[122],"kbtag":[126,61,789,352,355],"class_list":["post-165632","kb","type-kb","status-publish","hentry","kbtopic-mtl","kbtag-3d-printing","kbtag-material","kbtag-pu","kbtag-rubber","kbtag-silicone-rubber"],"yoast_head":"\nWhat's the Difference between Polyurethane Rubber (PU) and Silicone Rubber? - FacFox Docs<\/title>\n<meta name=\"description\" content=\"Silicone and polyurethane are both commonly used materials for o-rings, gaskets, seals, tubing, and membranes. While both elastomers may be used to create Silicone and polyurethane are both commonly used materials for o-rings, gaskets, seals, tubing, and membranes. While both elastomers may be used to create similar products, the specific application and environment will ultimately determine whether polyurethane or silicone will be the better choice for you.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/facfox.com\/docs\/kb\/whats-the-difference-between-polyurethane-rubber-pu-and-silicone-rubber\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What's the Difference between Polyurethane Rubber (PU) and Silicone Rubber?\" \/>\n<meta property=\"og:description\" content=\"Silicone and polyurethane are both commonly used materials for o-rings, gaskets, seals, tubing, and membranes. While both elastomers may be used to create Silicone and polyurethane are both commonly used materials for o-rings, gaskets, seals, tubing, and membranes. 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