Portafill G 25

Portafill® G2 appears to be a specific grade within the Portafill® G series, which is a line of products characterized as iron-free, milled, amorphous calcium-aluminum silicates. Here's a breakdown based on the information provided:

Composition and Quality

• Material Type: Amorphous calcium-aluminum silicate, which means it lacks a clearly defined shape or form (non-crystalline).
• Quality Control: The product's consistency and quality are maintained under an ISO 9001 certified quality management system. This certification ensures that the product meets specific standards of quality in its production and supply.
• Purity: Notably free of iron and crystalline silica, which is crucial for applications requiring high purity and specific chemical properties.

Physical Properties

• Particle Size: Available in various grades (G25, G45, G75) with different mean particle sizes. For instance, G25 has a median diameter (D50) of 12 µm, indicating that 50% of the particles are below 12 µm.
• Oil Absorption: Relatively low, which can influence how it interacts with different mediums in paint or sealant formulations.
• Color: Exhibits a high lightness value (L* = 93), suggesting it is very light in color, beneficial for maintaining color integrity in applications.
• Moisture Content: Very low moisture content, which is good for stability and storage.
• pH: Neutral, which means it won't significantly alter the pH of mixtures it's added to.
• Density and Bulk Density: Fairly light with consistent density across different particle sizes, affecting its application in terms of volume and weight considerations.
• Hardness: A Mohs' scale hardness of 6 indicates it's relatively hard, useful for applications needing abrasive resistance.
• Refractive Index: At 1.55, which might be relevant in applications where light refraction is considered.

Chemical Analysis

• Main Components: Predominantly SiO2 (silicon dioxide) and CaO (calcium oxide), with a significant amount of Al2O3 (aluminum oxide). This composition contributes to its inertness and stability.
• Trace Elements: Very low in Fe2O3 (iron oxide), which confirms its iron-free claim, crucial for applications where iron content could be detrimental.

Applications

• Paints and Sealants: Its transparency, chemical inertness, and abrasive resistance make it ideal for these applications. The lack of crystalline silica also means lower health risks in applications producing dust.
• Composites: Used for enhancing dimensional stability and electrical properties, likely due to its particle size distribution and chemical composition.

Environmental Impact

• Sustainability: The mention of contributing to sustainable chemistry suggests that Portafill® G2 might be sourced or processed in an environmentally friendly manner, though specifics aren't provided.

In summary, Portafill® G2 and its variants are specialized fillers used in industries where the specific properties of particle size, chemical inertness, and physical stability are paramount. Its characteristics make it particularly valuable in high-end applications where material transparency, resistance to chemicals, and electrical properties are crucial.