Miyagoshi Turugi #400 ceramic stone

Miyagoshi Turugi 400 – Artisan Sharpening Stone (#400)

Miyagoshi Seito (宮越製陶) is a small manufacturer from Kyoto that has been handcrafting sharpening stones for demanding users for several decades. Turugi 400 is a medium grit model designed for basic sharpening of knives and tools. It is made using a vitrification (glazing) process, which ensures exceptional durability, resistance to deformation, and consistent abrasion quality.

This process involves compressing a mixture of abrasive and binder under high pressure and then firing it for about 33 hours at a temperature of 1300°C. The result is a homogeneous structure with high dimensional stability that does not absorb excessive water and maintains a flat surface for a long time.

Application of #400 grit

400 grit is a universal choice for the actual sharpening stage – between aggressive grinding and edge finishing. The Turugi 400 Stone is suitable for:

• restoring sharpness to dull blades,
  
• correcting cutting edges,
  
• preparing surfaces for further smoothing (e.g., with #1000 or #3000).
  

It is especially recommended for kitchen knives, carpentry tools, and general workshop applications.

Characteristic features:

• handmade in a small workshop in Kyoto – a guarantee of precision and quality control,
  
• made using vitrification (glazing) technology – durability and resistance to deformation,
  
• microporous structure – absorbs water well and provides adequate slip,
  
• stable, even surface – minimal need for flattening,
  
• aesthetic appearance – light, yellowish-white marbled surface.

Specifications:

• Brand: Miyagoshi Seito (宮越製陶)
  
• Product name: Miyagoshi Turugi 400
  
• Type: sharpening stone – medium grit
  
• Grit: #400
  
• Average grain size: approx. 30 microns
  
• Abrasive: aluminum oxide (Al₂O₃), zirconium oxide (ZrO₂)
  
• Binder: vitrified (vitrified) mineral binder
  
• Production method: high-pressure molding, fired at ~1300°C for 33 hours
  
• Color: marbled, yellow-white
  
• Dimensions: approx. 205 × 75 × 25 mm
  
• Weight: approx. 800–900 g
  
• Origin (Made in): Kyoto, Japan