{"id":28938,"date":"2025-08-18T09:57:51","date_gmt":"2025-08-18T07:57:51","guid":{"rendered":"https:\/\/zinn-giesserei-goehler.com\/?post_type=product&p=28938"},"modified":"2026-05-01T17:22:33","modified_gmt":"2026-05-01T15:22:33","slug":"quartz-sand-for-sodium-silicate-process","status":"publish","type":"product","link":"https:\/\/zinn-giesserei-goehler.com\/en\/produkt\/quartz-sand-for-sodium-silicate-process\/","title":{"rendered":"Quartz Sand for Sodium Silicate Process"},"content":{"rendered":"

Fine Quartz Sand for Water Glass Process<\/strong><\/p>\n

The sand is suitable for building molds and cores for metals and alloys with melting points up to 1200\u00b0C. Its fine grain size enables a relatively smooth surface quality. <\/p>\n

We recommend using the water glass process primarily for building cores. These can be easily used in combination with oil sand or water-bentonite bonded sand. With oil sand and water-bentonite sand, you achieve higher surface qualities than with the water glass process. Additionally, the materials used and reusability are significantly more cost-effective with oil sand and water-bentonite sand, or even possible at all. As a core process, however, the water glass process is generally better suited because no mechanical compaction of the sand is required to ensure strength. Light compaction is sufficient, as the main strength is achieved through chemical hardening. <\/p>\n

For the hardening process, the sodium silicate binder TZ19 is required in any case. For this to work subsequently, either CO2 gassing must be applied or hardener W20 must be used. A combination of both hardening agents is also possible but not actually necessary. <\/p>\n

Technical data for our oil-bonded molding sand:<\/strong><\/p>\n

Compressive strength:<\/strong> 8.0 N\/cm\u00b2
\nTransverse strength:<\/strong> 2.2 N\/cm\u00b2
\nGas permeability:<\/strong> 30-35
\nCompactability:<\/strong> 64%
\nFineness (AFS): <\/strong>140
\nMean grain size: <\/strong> 0.09 mm<\/p>\n

 <\/p>\n

For use:<\/strong><\/p>\n

Measure the required sand volume and fill the quartz sand into a mixing container.<\/p>\n

Next, add 3-4% of the sand mass of sodium silicate binder TZ19. Stir this in for approximately 2-3 min. so that it distributes well in the sand. <\/p>\n

If you are working with CO2<\/sub>, now form the sand into the desired shape and optionally pierce small, thin holes into the sand. These facilitate CO2<\/sub> absorption and ensure better through-hardening. Now expose the core or mold half to CO2<\/sub> gassing and ensure that the gas does not escape, e.g. by flooding a closed container with CO2<\/sub> and then covering it. CO2<\/sub> is denser than air at room temperature. The hardening process takes approximately 20-30 min, depending on the thickness of the core, possibly less or somewhat longer. <\/p>\n

If you wish to use hardener W20 for hardening, mix this into the sand after mixing in the sodium silicate binder TZ19. For this, use approximately 0.5-1% hardener W20, measured by sand mass. Ideally, mix already during addition or immediately thereafter. This prevents clumping and ensures the best possible hardener distribution. Mixing should also take approximately 2-3 min. <\/p>\n

After mixing, place the sand directly into the desired and already prepared mold, distribute it, and press it down lightly. Here too, CO2<\/sub> gassing can optionally be applied to achieve optimal strength, but this is not necessary in principle. Hardening now takes 20-30 min, after which the core or mold half should be sufficiently firm. <\/p>\n

For very thick cores and molds, it may be sensible to use both hardener W20 and CO2<\/sub> for hardening to ensure optimal through-hardening.<\/p>\n

Avoid further shape changes after CO2<\/sub> gassing or after bringing into shape following mixing with hardener W20. This destroys the chemically built bonds between the sand grains and thus reduces the strength of the sand. <\/p>\n

After casting and demolding, the sand unfortunately cannot be reused without further processing. Thermochemical processes are required to remove the sodium silicate bond, which typically cannot be implemented on a small scale. <\/p>\n

You can also obtain the following necessary auxiliary materials from us:<\/p>\n

 <\/p>\n

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

Mold Making Sand Casting<\/p>\n","protected":false},"featured_media":34962,"template":"","meta":[],"product_brand":[],"product_cat":[284,514],"product_tag":[314,313,515],"class_list":{"0":"post-28938","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-foundry-supplies","7":"product_cat-water-glass-process","8":"product_tag-mold-making","9":"product_tag-molding-sand","10":"product_tag-water-glass-process","11":"product_shipping_class-free","13":"first","14":"instock","15":"taxable","16":"shipping-taxable","17":"purchasable","18":"product-type-variable"},"yoast_head":"\nQuartz Sand for Sodium Silicate Process - Zinn Gie\u00dferei G\u00f6hler<\/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:\/\/zinn-giesserei-goehler.com\/en\/produkt\/quartz-sand-for-sodium-silicate-process\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quartz Sand for Sodium Silicate Process - 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