The industry doesn't have standard frit sizes. While they may use the similar language e.g. Powder, Fine, Medium etc., the grading of the sizes is different.  

To best illustrate the differences, let us compare the Powder grade across the Manufacturers, Reichenbach has the finest powder and Effetre has the coarsest powder. Here is a table summary: 

Manufacturer	Powder Particle Size (mm)	Grain Particle Size (mm)	Very Fine Particle Size (mm)	Fine Particle Size (mm)	Medium Particle Size (mm)	Course Particle Size (mm)	Large Particle Size (mm)	Extra Large Particle Size (mm)
Bullseye	0- 0.2			0.2-1.2	1.2-2.7	2.7-5.2		5.2-30
Kugler	0- 0.25	0.25-0.5	0.5-1	1-2.4	2.4-3.8	3.8-5	5.8-8	8-21
Reichenbach	0- 0.2	0-0.5	0.5-1	1-2.4	2.4-3.8	3.8-5	5.0-8	8-11.5
Oceanside (System 96)	0.13-0.25			0.25-0.75	0.75-2.5	2.5-7.6		7.6-15
Effetre	0 - 0.8			0.8-2	2-3	3-4	4+

 

Kugler and Reichenbach are both German glass manufacturers and refer to frit as Grit and Powder. 

Below is the breakdown for each Manufacturer we resell. Note Bullseye have added mesh screen size for those wanting to sift the frit onto their work - See bottom for what the mesh size details.

Sizes by COE

COE090 - Bullseye

Bullseye Glass Frit comes in 5 sizes: Powder, Fine, Medium, Course and Extra Large. 

Bullseye powder frit (-0008):

Grain sizes are 0.2mm and finer; granules pass through an 80-mesh screen. 

 

 

Bullseye fine frit (-0001):
Grain sizes range from 0.2 – 1.2mm; granules pass through a 16-mesh screen but are retained on an 80-mesh screen.

 

 

Bullseye medium frit (-0002):
Grain sizes range from 1.2 – 2.7mm; granules pass through an 8-mesh screen but are retained on a 16-mesh screen.

 

 

Bullseye coarse frit (-0003):
Grain sizes range from 2.7 – 5.2mm; granules pass through a 4-mesh screen but are retained on an 8-mesh screen.

 

 

Bullseye extra large frit (-0005):

Grain sizes range from 5.2 – 30mm; granules are retained on a 4-mesh screen.

 

 

COE096 - Oceanside

Oceanside offers 5 sizes.

Oceanside Mosaic frit (F7) :

Grain sizes range from 7.6 - 15mm;

 

 

 

COE096 - Kugler

Kugler Frit is available in 8 sizes: 

Kugler K-00 frit:

Grain sizes range from 0.25-0.5mm

Kugler K-0 frit (Very Fine):

Grain sizes range from 0.5-1mm

Kugler K-1 frit (Fine):

Grain sizes range from 1-2.4mm

Kugler K2 frit  (Medium):

Grain sizes range from 2.4 - 3.8mm 

Reichenbach K3 frit  (Large):

Grain sizes range from 3.8-5mm 

Reichenbach K4 frit :

Grain sizes range from 5.8-8mm

Kugler K5 frit : Grain sizes range from 8-21mm 

COE096 - Reichenbach

Reichenbach also has 8 grades but they are not the same!

 

Reichenbach Powder frit :

Grain sizes range from 0 - 0.2mm

 

 

 

 Reichenbach Grain frit :

Grain sizes range from 0 - 0.5mm = Grain

 

 

 

Reichenbach K0 frit  (Very Fine):

Grain sizes range from 0.5 -1mm

 

 

 

 

COE104 - Effetre

Effetre Frit is an Italian glass made by grinding self-tempered glass blocks.

Its suitable for hot and cold working as its not subject to tension in the smoothing and polishing stages. They have 69 standard colours with other colours potentially available for larger quantities (e.g. handpull colours). Their grades for frit are:

• 0-0.8mm diameter = Powder,
• 0.8-2mm diameter = Fine,
• 2-3mm diameter = Medium
• 3- 4mm diameter = Course and 
• 0-4mm+ = Chunk/Mixed 

COE104 - Double Helix

Double Helix produces a small amount of Frit and offers 4 sizes: Powder, Fine, Medium and Course. I have requested sizing from the manufacturer and will update once I have this information.

Mesh Sizes 

Mesh size usually is referring to the mesh number (a US measurement standard) and its relationship to the size of the openings in the mesh and thus the size of particles that can pass through these openings. Figuring out the mesh number is simple. All you do is count the number of openings in one linear inch of screen. This count is the mesh number. A 4-mesh screen means there are four little square openings across one inch of screen. A 100-mesh screen has 100 openings per inch, and so on.

Common Mesh sizes for Glass workers are: 40, 60 and 80 Mesh. 

Mesh Size	Typical Opening Size
4	4.75mm
8	2.36mm
16	1.18mm
60	0.25mm
80	0.18mm