{"id":716,"date":"2025-08-12T07:59:43","date_gmt":"2025-08-12T07:59:43","guid":{"rendered":"https:\/\/projectessastre.com\/?p=716"},"modified":"2026-02-15T18:21:16","modified_gmt":"2026-02-15T18:21:16","slug":"sandblasting-which-abrasive-to-choose-for-each-case","status":"publish","type":"post","link":"https:\/\/projectessastre.com\/en\/chorro-de-arena-que-abrasivo-elegir-para-cada-caso\/","title":{"rendered":"Sandblasting: Which Abrasive to Choose for Each Case"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Choosing the right abrasive for sandblasting isn&#039;t just a technical detail: it makes the difference between a flawless finish and one that leaves something to be desired. It&#039;s not just about &quot;cleaning&quot; or &quot;roughing&quot;; it&#039;s about understanding what the surface really needs, how we want it to look, and what it will be used for later. Every little bit counts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are many options available on the market. Some sound more familiar\u2014such as bicarbonate, corundum, or glass microspheres\u2014but others are equally useful, depending on the case: steel or stainless steel shot, garnet sand, walnut shell, or even ceramic. Each has its own advantages, limitations, and very specific uses.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Which abrasive should you choose depending on the type of surface?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The first step, and perhaps the most important, is to take a good look at the material you&#039;re going to treat. Is it fragile? Is it resistant? An abrasive that&#039;s too harsh can mark or deform the piece. A very soft one, on the other hand, won&#039;t do much on a hard surface. So it&#039;s not a question of going all out, but rather getting it right.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sodium bicarbonate<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When care and precision are needed.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ideal for thin aluminum, fiberglass or plastic parts.<\/li>\n\n\n\n<li>Works well on chrome or glass surfaces.<\/li>\n\n\n\n<li>Perfect for heritage restorations, soot or light soiling.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, it doesn&#039;t leave any roughness, so if you&#039;re going to paint afterwards, it&#039;s a good idea to go one step further with another abrasive. It&#039;s single-use and must be rinsed well, as it leaves alkaline residue.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Corundum (aluminum oxide)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hard as few (Mohs hardness 9), and with an angular shape.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To remove strong oxides or calamine on steel.<\/li>\n\n\n\n<li>Excellent for removing tough coatings.<\/li>\n\n\n\n<li>Widely used to prepare surfaces before applying paint or industrial coatings.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It creates a texture that helps coatings adhere better. And the best part: it&#039;s reusable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Glass microspheres<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When you&#039;re looking for a beautiful, even, scratch-free finish.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>They work very well on aluminum and stainless steel, such as in machinery or nautical furniture.<\/li>\n\n\n\n<li>They clean and satin evenly.<\/li>\n\n\n\n<li>They are also used for light shot peening (a technique that improves the strength of the metal).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">They leave no anchoring profile and can be reused.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Steel shot<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ideal for large carbon steel structures.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High cutting capacity.<\/li>\n\n\n\n<li>Very efficient if working in booths with a continuous recycling system.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Caution: Do not use on stainless steel, as it may contaminate it and cause rust.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stainless steel shot<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Same principle as above, but without the risk of cross-oxidation.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Perfect for stainless steel, aluminum or non-ferrous metals.<\/li>\n\n\n\n<li>Reusable many times.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Garnet sand<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A mineral abrasive with intermediate hardness and quite a bit of versatility.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suitable for steel, stone and concrete.<\/li>\n\n\n\n<li>Good balance between cutting and finishing ability.<\/li>\n\n\n\n<li>It is also used in water jet cutting.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Nutshell<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An ecological and very delicate option.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Perfect for cleaning without damaging: carved wood, engines, aeronautical parts.<\/li>\n\n\n\n<li>Does not attack soft metals or wear down the base.<\/li>\n\n\n\n<li>Biodegradable.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Ceramics<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Very resistant, designed for technical processes.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lasts much longer than other abrasives.<\/li>\n\n\n\n<li>It is used where constant and repetitive precision is needed.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Which abrasive should you choose depending on the desired finish?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Just as important as cleanliness is the final texture. Do we want the paint to adhere well? Or just leave the surface looking like new, without scraping?<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Profile-free finish (without leaving roughness)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Baking soda: cleans without modifying the original surface.<\/li>\n\n\n\n<li>Glass microspheres: leave an elegant satin finish, especially on stainless steel or aluminum.<\/li>\n\n\n\n<li>Walnut shell: perfect for fragile or soft surfaces.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Finished with anchoring profile (for better adhesion of paint or coating)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Corundum: fast, precise and with good roughness.<\/li>\n\n\n\n<li>Steel or stainless steel shot: aggressive profile, ideal for industrial environments.<\/li>\n\n\n\n<li>Garnet sand: leaves a good profile without being too abrasive.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Special or technical finishes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ceramics: for processes where everything must be perfectly uniform and controlled.<\/li>\n\n\n\n<li>Shot peening: with microspheres or spherical shot, to increase the metal&#039;s fatigue resistance.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Common mistakes when choosing abrasive<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A mistake at this stage can be costly or ruin the entire job. Some common mistakes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Using too much pressure or a very aggressive abrasive on thin sheets and deforming them.<\/li>\n\n\n\n<li>Contaminate stainless steel with steel particles.<\/li>\n\n\n\n<li>Painting over a piece treated with baking soda without rinsing well.<\/li>\n\n\n\n<li>Expect the walnut shell or microbeads to create roughness (spoiler: they don&#039;t).<\/li>\n\n\n\n<li>Use steel shot on aluminum or stainless steel and end up rusting it.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Technical details that also influence<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It&#039;s not just the type of abrasive. There are other factors at play:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Grit size: The finer the grit, the smoother the finish. If it&#039;s coarse, it cuts harder.<\/li>\n\n\n\n<li>Pressure: more pressure, more aggressive\u2026 but also more risk if not controlled.<\/li>\n\n\n\n<li>Impact angle: 90\u00b0 cuts more; at low angles, cleaning is smoother.<\/li>\n\n\n\n<li>Recyclability: Some abrasives last longer than others. Corundum, microspheres, and shot last quite a while; bicarbonate and shell, much less so.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Real cases: which abrasive should you choose?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Classic car restoration: baking soda or walnut shells to avoid damaging the sheet metal.<\/li>\n\n\n\n<li>Steel boat hull: corundum or garnet sand, to remove rust and prepare the surface.<\/li>\n\n\n\n<li>Stainless steel machinery: stainless steel microspheres or shot, for a clean and uniform finish.<\/li>\n\n\n\n<li>Carved wood: walnut shell, for its softness.<\/li>\n\n\n\n<li>Large metal structures: steel shot, for speed and performance.<\/li>\n\n\n\n<li>Technical treatments: ceramic or microspheres, depending on the process.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Sandblasting experts in Mallorca<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">At <a href=\"https:\/\/projectessastre.com\/en\/\">Projectes Sastre<\/a> We have been working with for years <a href=\"https:\/\/projectessastre.com\/en\/sandblasting\/\">sandblasting in Mallorca<\/a>, in sectors as diverse as nautical, automotive, industrial, construction, and heritage restoration. We know that every surface has its history, wear, and future purpose. That&#039;s why we don&#039;t always use the same thing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We offer a wide variety of abrasives: bicarbonate, corundum, glass microspheres, shot (steel and stainless steel), garnet sand, walnut shell, and ceramic. This allows us to tailor the treatment to each project without compromising the result.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do you need advice or a professional sandblasting service in Mallorca? Write to us. We&#039;ll study your case, select the most suitable abrasive, and work with precision equipment to ensure your surface is ready for whatever comes next.<\/p>","protected":false},"excerpt":{"rendered":"<p>Elegir el abrasivo adecuado en un trabajo de chorro de arena no es un simple detalle t\u00e9cnico: marca la diferencia entre un acabado impecable y uno que deja que desear. No se trata solo de \u201climpiar\u201d o \u201cdesbastar\u201d; se trata de entender qu\u00e9 necesita realmente la superficie, c\u00f3mo queremos que quede y para qu\u00e9 se [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":717,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_joinchat":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-716","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Chorro de Arena: Qu\u00e9 Abrasivo Elegir para cada caso - Projectes Sastre<\/title>\n<meta name=\"description\" content=\"Descubre qu\u00e9 abrasivo elegir para cada trabajo de chorro de arena: bicarbonato, corind\u00f3n, microesferas, granalla, garnet... 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