In the production of acrylic sheets, PMMA sheets are primarily manufactured using two distinct processes: extrusion and casting. Each process yields materials with unique characteristics, and these differing production methods directly influence the material’s performance in end-use applications such as bathtubs and spa tubs.
Extruded PMMA Sheet：
Extruded acrylic sheets are produced by continuously forcing molten PMMA resin through a die opening, thereby forming a sheet of uniform thickness.
Key Features:
Consistent thickness control and precise dimensions
Lower production costs
Suitable for large-scale mass production
Suitable for basic thermoforming applications
Limitations:
Lower molecular weight
Slightly weaker impact resistance
Higher internal stress in certain instances
Not suitable for high-end or deep-formed (deep-drawn) products
Cast PMMA Sheet：
Cast acrylic sheets are produced by pouring liquid PMMA monomer into a mold, where it undergoes slow polymerization and curing within the mold cavity.
Key Features:
Higher molecular weight
Superior optical clarity
Greater impact resistance
Lower internal stress
Exceptional thermoforming performance
Advantages in Bathtub Production:
Greater deep-drawing (deep-forming) capability
Lower risk of cracking during the forming process
Surface quality remains stable after heating
The preferred material for manufacturing high-end bathtubs
Summary of Key Differences
| Characteristic | Extruded PMMA Sheet | Cast PMMA Sheet |
| Cost | Lower | Higher |
| Strength | Moderate | Higher |
| Thermoforming Performance | Basic | Exceptional |
| Surface Quality | Stable | Premium |
| Application Areas | Standard Products | High-End Bathtubs |
The Liangjing brand has long been dedicated to the research and development of acrylic sheets. Our PMMA sheets combine excellent mechanical properties with high chemical resistance, making them one of the most widely used materials for manufacturing bathtubs and whirlpool tubs. We have achieved significant technical expertise in both extruded and cast acrylic sheets.
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