Mixing and Curing Guide for Gasbond Premium

Sand Mixing Tips with Gasbond:

1. Proper Proportioning:

   • Accurately measure the Gasbond based on the sand quantity. The typical ratio ranges from 2% to 5% of the sand's weight, but you should follow the manufacturer's recommendation or adjust based on your specific needs

2. Homogeneous Mixing:

   • Use a mullor or a similar mixing machine to ensure thorough and uniform mixing of Gasbond and sand. The goal is to coat every sand grain with the binder
   • While understanding not everyone has access to a mullor, our suggestion is to buy a used mixer such as a standard Kitchen Aid pastry mixer and use it as a dedicated blender for your projects
   • Mixing should continue until there are no visible clumps or dry patches of sand, which typically takes about 4-5 minutes

3. Consistent Sand Quality:

   • Ensure the sand is dry (less than 0.5% moisture is our recommendation) and free of clay or other impurities that could affect the binding process
   • While Gasbond Premium does have moisture resistance, dryness is always preferred

4. Temperature Control:

   • Perform the mixing at room temperature to maintain the binder's effectiveness. Extreme temperatures can alter the viscosity and performance of the binder

5. Additive Integration:

   • If you are using any additives to improve the sand mix's properties, ensure they are evenly distributed throughout the sand before adding the Gasbond

CO2 Permeation Tips:

1. Adequate Gassing Equipment:

   • Use proper gassing equipment that can introduce CO2 uniformly across the core box. The equipment should be capable of delivering the gas at the right flow rate and pressure

2. Even Distribution:

   • For larger cores, use multiple gassing points to ensure the CO2 reaches all parts of the sand mix. This might require designing the core box with proper venting or strategically placing gassing points

3. Proper Gassing Time:

   • Adjust the gassing time based on the core size and density. Smaller cores may harden in seconds, while larger ones require longer gassing. Observing the process and outcomes will help you fine-tune the timing

4. Core Box Design:

   • Ensure the core box allows for uniform gas flow. Adequate venting and gas channels will help distribute the CO2 evenly

5. Monitoring and Testing:

   • After gassing, inspect the cores for hardness throughout. Uneven hardness can indicate inadequate CO2 distribution, prompting adjustments in gassing technique

6. Experience and Adjustment:

   • Gaining familiarity with your specific equipment and materials will allow you to make informed adjustments, ensuring optimal outcomes with practice and observation

By focusing on these best practices, you can achieve a consistent and high-quality result in your core and mold-making processes using Gasbond and CO2 hardening.