{"id":39822,"date":"2024-09-05T10:57:25","date_gmt":"2024-09-05T08:57:25","guid":{"rendered":"https:\/\/conservation-science.ch\/?page_id=39822"},"modified":"2024-09-05T10:57:25","modified_gmt":"2024-09-05T08:57:25","slug":"drop-test-1st-part","status":"publish","type":"page","link":"https:\/\/conservation-science.ch\/?page_id=39822&lang=en","title":{"rendered":"Drop test, 1st part"},"content":{"rendered":"

How to find out whether a material is water repellent or not: drop test, 1st part<\/strong>
\nbefore applying a paint, a plaster, a render or a repair mortar it is necessary to know if the surface to be covered or the material to be repaired is water repellent.
\nBy definition a water repellent material does not like water and will reject it.
\nPratically this means that if you try to put a water drop on a water repellent surface the drop will \u00ab\u00a0refuse\u00a0\u00bb to adhere: it will form a sphere on horizontal surfaces and roll off on inclined ones.
\nHence the drop test described here after can be applied to determine whether a surface is water repellent or not.
\n(Caution: of course this test should only be used on materials that are not water sensible!)<\/p>\n

1 – To apply the drop<\/strong>
\ncarefully bring a little drop of water on the material surface you would like to test<\/p>\n\n\n\n
\"[Keine<\/p>\n

horizontal surface<\/td>\n

\"\"<\/p>\n

vertical surface<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2 – If the material is water repellent<\/strong>
\nthe water drop will form a ball which is more ore less oblate (on strongly inclined or vertical surfaces it will roll)<\/p>\n\n\n\n
\"[Keine
\nhighly water repellent surface<\/td>\n		\"[Keine
\nless water repellent surface<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3 – If the material is not water repellent<\/strong>
\n– the water drop will wet the surface and will, if the material is porous (a), be more or less rapidely absorbed by the material;
\n– if the material is non porous, the water drop will humidify the surface and expand over it without being absorbed (b). The water will in this case disapear slowly by evaporation.<\/p>\n\n\n\n
\"[Keine
\n(a) non water repellent, porous and capillary active material<\/td>\n		\"[Keine
\n(b) non water repellent, non porous\u00a0 material<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Drop test, continuation :<\/span>\u00a0<\/strong>in our next trick we will explain how you can find out whether a surface treatment forms a dense, non porous film or whether it \u00ab\u00a0only\u00a0\u00bb makes the surface water repellent without blocking the pores\u00a0…
\n<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

How to find out whether a material is water repellent or not: drop test, 1st part before applying a paint, a plaster, a render or a repair mortar it is necessary to know if the surface to be covered or the material to be repaired is water repellent. By definition a water repellent material does … Continuer la lecture de Drop test, 1st part<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"parent":39773,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-39822","page","type-page","status-publish","hentry"],"yoast_head":"\nDrop test, 1st part - Bl\u00e4uer - Conservation - Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/conservation-science.ch\/?page_id=39822&lang=en\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Drop test, 1st part - Bl\u00e4uer - Conservation - Science\" \/>\n<meta property=\"og:description\" content=\"How to find out whether a material is water repellent or not: drop test, 1st part before applying a paint, a plaster, a render or a repair mortar it is necessary to know if the surface to be covered or the material to be repaired is water repellent. 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