Name: Feldspar Powder Extender F-400
Brand: Coatingsink
SKU: feldspar-powder-f400
Availability: InStock

Question 1

What advantages does feldspar offer as an extender in industrial primers?

Accepted Answer

Feldspar's Mohs hardness of 6–6.5 imparts excellent abrasion and scratch resistance to cured primer films, an important property for industrial and marine maintenance coatings. Its low oil absorption (15–22 g/100g) allows high-loading formulations without excessive binder demand, enabling cost reduction while maintaining film build. Feldspar also contributes chemical inertness (resistant to mild acids and alkalis) and dimensional stability, helping primers maintain film integrity under cyclic thermal or mechanical stress.

Question 2

How does feldspar compare to crystalline silica (quartz flour) as an extender?

Accepted Answer

Feldspar and quartz are both aluminosilicate minerals, but feldspar contains significantly less free crystalline silica (crystalline SiO2 content typically 0–5%, vs quartz which is essentially 100% crystalline SiO2). This gives feldspar a more favourable respiratory safety profile under occupational hygiene regulations, making it a preferred alternative to quartz flour in formulations where crystalline silica exposure limits are a compliance concern. Its similar hardness, low oil absorption, and particle size range make it a practical direct substitute in most primer and floor coating applications.

SiO2 Content	65–70%
Al2O3 Content	18–21%
Mohs Hardness	6–6.5
Oil Absorption	15–22 g/100g
Particle Size (d50)	8–12 µm

Feldspar Powder Extender F-400

Specifications

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