{"id":3273,"date":"2026-08-19T08:31:22","date_gmt":"2026-08-19T00:31:22","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=3273"},"modified":"2026-08-19T08:31:23","modified_gmt":"2026-08-19T00:31:23","slug":"stone-back-bonding-process-the-most-common-stone-processing-technique","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/fr\/2026\/08\/19\/stone-back-bonding-process-the-most-common-stone-processing-technique\/","title":{"rendered":"Stone back-bonding process – The most common stone processing technique"},"content":{"rendered":"

Stone Back-Bevel Bonding Process (Back-Bevel Splicing \/ Back-Bevel Bonding)<\/h1>\n\n\n\n
\n

English: Back-bevel bonding, commonly known in the industry as back-bevel or slope bonding, is the mainstream process for splicing large granite\/marble slabs. It is widely used for large-sized granite inspection platforms and CMM bases when the original stone material is insufficient for the overall dimensions.<\/strong>
Simple understanding: On the two abutting sides of the spliced slabs, the joint is not made directly on the vertical surface. Instead, a 45\u00b0 (or 30-60\u00b0) diagonal bevel (back-bevel) is machined on the back of the slabs. The bonding is done on the sloped surface, leaving only an extremely fine joint on the front<\/strong>. The glue seam is almost invisible on the front working surface. The sloped bonding surface increases the bonding area, making it far superior to ordinary straight-edge joints in terms of peel and shear resistance.<\/p>\n<\/blockquote>\n\n\n\n

I. Process Principle<\/h2>\n\n\n\n

Ordinary straight-edge joint: The bonding surface is only the vertical cross-section of the slab thickness, resulting in a small bonding area that easily cracks under vibration or thermal stress.
Back-bevel bonding: A matching sloped bevel is milled on the back of the inner abutting sides of the two slabs. The bonding surface becomes a large inclined plane, increasing the bonding area by 2-3 times<\/strong>; a fine gap of 0.02-0.05mm is left on the front working surface, which is finally ground and polished to be almost invisible; the back sloped surface bears the main shear force, improving the overall rigidity of the spliced structure.<\/p>\n\n\n\n

\n

\u26a0\ufe0f Note: For Grade 000 ultra-high precision metrology platforms, high-end customers prioritize single-piece slabs without splicing; back-bevel splicing is mostly used for Grade 00 and large-sized bases. The process must be strictly controlled, otherwise, later stress release will cause flatness drift.<\/strong><\/p>\n<\/blockquote>\n\n\n\n

II. Complete Processing Workflow<\/h2>\n\n\n\n
    \n
  1. Material Selection and Pre-Splicing<\/strong>
    Select materials from the same quarry with similar textures and colors; use ultrasonic flaw detection to check for internal cracks; perform a dry fit to control the front gap to \u22640.05mm and ensure no light passes through.<\/li>\n\n\n\n
  2. CNC Milling of the Back-Bevel (Core Process)<\/strong>
    Mill a diagonal angle on the back of the abutting sides of the slabs, with a 45\u00b0 back-bevel<\/strong> being the most commonly used in the industry;<\/li>\n<\/ol>\n\n\n\n
      \n
    • For 150-200mm thick granite platforms: The back-bevel depth should be 2\/3 of the slab thickness, leaving 30-50mm of intact thickness on the front (the front working surface must not be milled through);<\/li>\n\n\n\n
    • For thin slabs (80-100mm): The back-bevel depth is about 1\/2 of the slab thickness to avoid the front solid part being too thin and chipping;<\/li>\n<\/ul>\n\n\n\n
      \n

      Key: The bevel angles of the two spliced pieces must match perfectly. The bevel surface should be roughened to remove the polished mirror finish, improving the glue’s mechanical interlocking.<\/p>\n<\/blockquote>\n\n\n\n

        \n
      1. Bonding Interface Treatment<\/strong>
        Thoroughly blow off stone dust with compressed air, wipe with alcohol, and dry. The interface must be dry and free of dust and oil; water residue is strictly prohibited, as it will significantly reduce bonding strength.<\/li>\n\n\n\n
      2. Glue Preparation and Application (Glue selection for granite precision platforms is critical)<\/strong>
        \u2705 Recommended: Low-shrinkage two-component structural epoxy stone adhesive<\/strong>, which can be color-matched to the stone;
        \u274c Prohibited: Ordinary marble glue (polyester glue): It has high curing shrinkage and brittleness, and is strictly forbidden for high-precision platforms. The later shrinkage of the glue layer will pull and deform the platform’s flatness. Apply glue on both sides<\/strong>; apply the glue evenly on the two back-bevel sloped surfaces, controlling the glue layer to 0.1-0.2mm. It cannot be too thick, as thick glue layers have a high risk of shrinkage deformation.<\/li>\n\n\n\n
      3. Alignment, Pressing, and Fixture Clamping<\/strong>
        Align the two slabs, moving them back and forth to squeeze out air bubbles; use specialized fixtures to clamp them evenly, with a fixture spacing of 250-350mm; apply uniform pressure, avoiding single-point high pressure to prevent slab warping; wipe off excess glue before it cures.<\/li>\n<\/ol>\n\n\n\n
          \n
        1. Durcissement \u00e0 temp\u00e9rature constante<\/strong>
          Cure in a dust-free workshop at an ambient temperature of 20-25\u00b0C static conditions; initial curing takes 24h, and full curing takes 48-72h; vibration, movement, and temperature fluctuations are prohibited during the curing process to allow the adhesive stress to be fully.<\/li>\n\n\n\n
        2. Overall Thickness Adjustment, Grinding, and Polishing (Mandatory for High-Precision Platforms)<\/strong>
          After the adhesive is fully cured, place the entire piece on a machine for coarse grinding, fine grinding, and precision grinding to re-level the working surface and restore the flatness accuracy; it must not be treated as a finished product immediately after bonding; joint position must be re-ground as a whole to eliminate flatness deviations caused by bonding stress<\/strong>.<\/li>\n\n\n\n
        3. Inspection and Acceptance<\/strong><\/li>\n<\/ol>\n\n\n\n
            \n
          • Tap test: Listen to the sound to determine if there any hollow sound or debonding;<\/li>\n\n\n\n
          • Laser interferometer test to check the overall flatness;<\/li>\n\n\n\n
          • Inspect the front joint: The gap must be \u22640.05mm, no opening or adhesive seepage;<\/li>\n\n\n\n
          • Inspect the back side for the adhesive layer, ensuring no air bubbles or missing adhesive.<\/li>\n<\/ul>\n\n\n\n

            III. Advantages and Disadvantages of Back-Chamfer Bonding Process<\/h2>\n\n\n\n

            \u2705 Advantages<\/h3>\n\n\n\n
              \n
            1. The bonding area is significantly increased, and the shear and vibration resistance are far superior to ordinary butt joints, making it suitable for large-sized granite bases;<\/li>\n\n\n\n
            2. The gap on the front working surface is extremely small, achieving a nearly “seamless” appearance after polishing;<\/li>\n\n\n\n
            3. Compared to whole large slabs, it reduces material procurement costs and solves the size limitations of large quarry blocks.<\/li>\n<\/ol>\n\n\n\n

              \u274c Disadvantages (Key Risks for Precision Platforms)<\/h3>\n\n\n\n
                \n
              1. Risk of adhesive curing shrinkage<\/strong>: Poor process control can lead to shrinkage of the adhesive layer, causing the platform’s flatness to drift and precision to degrade;<\/li>\n\n\n\n
              2. It is a bonded structure and cannot be equated to a single whole stone<\/strong>; some high-end customers using 000-grade metrology-grade CMMs will reject bonded components;<\/li>\n\n\n\n
              3. The processing steps are numerous, with high requirements for equipment, adhesive, and curing environment; cutting corners in the factory (using marble glue, non-constant temperature curing, or grinding before sufficient curing) easily leads to quality hazards.<\/li>\n<\/ol>\n\n\n\n

                IV. Quick Reference Table of Key Process Parameters for Granite Precision Platform Back-Chamfer Bonding<\/h2>\n\n\n\n

                Tableau<\/p>\n\n\n\n

                Slab Thickness<\/th>Recommended Back-Chamfer Angle<\/th>Back-Chamfer Milling Depth<\/th>Front Solid Thickness Retained<\/th>Applicable Scenarios<\/th><\/tr><\/thead>
                80-100mm Thin Slab<\/td>45\u00b0<\/td>1\/2 of slab thickness<\/td>\u226540mm<\/td>Small and medium-sized inspection platforms<\/td><\/tr>
                150-200mm Mainstream Base<\/td>45\u00b0<\/td>2\/3 of slab thickness<\/td>40-50mm<\/td>00-grade CMM granite bases (most commonly used in foreign trade)<\/td><\/tr>
                >250mm Heavy-duty Thick Slab<\/td>45\u00b0<\/td>2\/3 of slab thickness<\/td>50-70mm<\/td>Heavy-duty equipment bases<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                \n

                Supplement: A few factories use a 60\u00b0 back-chamfer, which provides a larger slope and stronger bonding, but the front solid thickness becomes even thinner, making the corners more prone to chipping.<\/p>\n<\/blockquote>\n\n\n\n

                \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

                Stone Back-Bevel Bonding Process (Back-Bevel Splicing \/ Back-Bevel Bonding) English: Back-bevel bonding, commonly known in the industry as back-bevel or slope bonding, is the mainstream process for splicing large granite\/marble slabs. It is widely used for large-sized granite inspection platforms and CMM bases when the original stone material is insufficient for the overall dimensions.Simple understanding:…<\/p>","protected":false},"author":1,"featured_media":3274,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[35],"tags":[],"class_list":["post-3273","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"taxonomy_info":{"category":[{"value":35,"label":"NEWS"}]},"featured_image_src_large":["https:\/\/jtlcnc.com\/wp-content\/uploads\/2026\/08\/r-1024x543.png",1024,543,true],"author_info":{"display_name":"jinxing6611@gmail.com","author_link":"https:\/\/jtlcnc.com\/fr\/author\/jtlcnc\/"},"comment_info":1,"category_info":[{"term_id":35,"name":"NEWS","slug":"news","term_group":0,"term_taxonomy_id":35,"taxonomy":"category","description":"","parent":0,"count":362,"filter":"raw","cat_ID":35,"category_count":362,"category_description":"","cat_name":"NEWS","category_nicename":"news","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/3273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/comments?post=3273"}],"version-history":[{"count":1,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/3273\/revisions"}],"predecessor-version":[{"id":3275,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/posts\/3273\/revisions\/3275"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media\/3274"}],"wp:attachment":[{"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/media?parent=3273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/categories?post=3273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jtlcnc.com\/fr\/wp-json\/wp\/v2\/tags?post=3273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}