{"id":96706,"date":"2026-02-10T13:51:07","date_gmt":"2026-02-10T12:51:07","guid":{"rendered":"https:\/\/staging.express.fr\/produit\/universal-flux-839\/"},"modified":"2026-02-26T16:44:34","modified_gmt":"2026-02-26T15:44:34","slug":"universal-flux-839","status":"publish","type":"product","link":"https:\/\/staging.express.fr\/en\/product\/universal-flux-839\/","title":{"rendered":"Universal flux Cat. No. 839"},"content":{"rendered":"<p>For a long time now, efforts have been made to innovate in the area of roofer\u2019s flux, to create a mixture that is truly universal.<\/p>\n<p>It is true that significant improvements have been made by manufacturers here and there. However, new products have been developed without full knowledge of the requirements and working habits of <strong>roofing professionals<\/strong>.<\/p>\n<p>Following the success encountered by its <a href=\"https:\/\/www.express.fr\/en\/product\/decap-green-flux-cat-no-855\/\">organic flux Decap\u2019 Green Cat. No. 855<\/a>, <a href=\"https:\/\/www.express.fr\/en\/organisation\/\">the company Guilbert Express<\/a> \u201csince 1905\u201d decided to develop another acid-free <strong>brazing flux<\/strong> that would be truly universal, through its brand Express.<\/p>\n<p>The aim was for it to be effective <strong>at maximum temperatures of up to around 375\u00b0C.<\/strong> <u>This is indeed the case with the product presented here<\/u>.<\/p>\n<p>For the <a href=\"https:\/\/www.express.fr\/en\/organisation\/research-development\/\">Express R&amp;D team<\/a>, it was clear that the bottle should not have a brush, to avoid users accidentally contaminating it with dirt, which is inevitably present on roofs, and making it good for nothing but the bin!<\/p>\n<p>And so our <strong>universal brazing flux Cat. No. 839<\/strong> was born, supplied in a bottle&#8230; with no brush.<\/p>\n<p>This <strong>all-new universal flux Cat. No. 839<\/strong> can be used to join very many materials, including <strong>natural zinc<\/strong>, <strong>old zinc, copper and brass<\/strong>, while delivering an extremely powerful cleaning action in comparison with other fluxes.<\/p>\n<p><strong>Catalogue number 839, universal roofer\u2019s flux,<\/strong> will make an excellent addition to any roofer\u2019s kit, particularly in combination with the <a href=\"https:\/\/www.express.fr\/en\/product\/bottle-and-brush-for-flux-cat-no-9647\/\">bottle and brush for flux Cat. No. 9647<\/a>, which can be used to pour out <u>just the right amount needed for the job at hand<\/u>.<\/p>\n<p>It is also worth noting that this universal flux Cat. No. 839 is even easier to work with when paired with our roofer\u2019s holders <a href=\"https:\/\/www.express.fr\/en\/product\/holder-for-stone-and-flux-with-brush-9640\/\">Cat. No. 9640 <\/a>and <a href=\"https:\/\/www.express.fr\/en\/product\/premium-roofers-holder-cat-no-9645\/\">Cat. No. 9645<\/a>.<\/p>\n<p><strong>Sold in a pack of 6, you will find this new product at your usual Express dealer.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recommended for oxidized metals.<\/p>\n","protected":false},"featured_media":77913,"comment_status":"open","ping_status":"open","template":"","meta":{"_acf_changed":false,"content-type":""},"etheme_brands":[],"product_brand":[],"product_cat":[653,637,633],"product_tag":[],"class_list":{"0":"post-96706","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-consumables-roof-covering","7":"product_cat-roof-covering-tools","8":"product_cat-roofing-tools","10":"first","11":"instock","12":"taxable","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Universal flux Cat. 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