Important factors, which have influence on the fit:

• Sprue design
• Storage temperature (inside a climatic cabinet 18 – 20 °C / 64 – 68 °F)
• Working temperature of powder and liquid (20 – 22 °C / 68 – 72 °F)
• Concentration of the mixing liquid
• Accurate measuring of powder and liquid
• Muffle system (with or without metal ring)
• Muffle size (size 3, 6 or 9)
• Observance of constant stirring times
• Investing under pressure (lower expansion)
• Preheating process (speed or conventional)
• Quality of the furnace
• Type of alloy