I have recently acquired some Carborundum/Silicon Carbide in 1 lb. jars.
The labels indicate:

1F RA
2F RA
180 GG
220 RA
400 RA

The last 3 are pretty straightforward, but what do the first 2 mean and
what does the RA/GG indicate? Any knowledge of possible grit sizes in
microns? These jars were manufactured by the Canadian Carborundum Company
of Niagara Falls, Canada (the cheap electricity?).
Mike in BC

"Michael Gray" wrote in message
news
I have recently acquired some Carborundum/Silicon Carbide in 1 lb. jars.
The labels indicate:

1F RA
2F RA
180 GG
220 RA
400 RA

The last 3 are pretty straightforward, but what do the first 2 mean and
what does the RA/GG indicate? Any knowledge of possible grit sizes in
microns? These jars were manufactured by the Canadian Carborundum Company
of Niagara Falls, Canada (the cheap electricity?).
Mike in BC

Scroll to near the bottom:

http://www.metalfinishingsystems.com/tt-abrasive.html

'Dunno about the GG and RA.

--
Ed Huntress

On Sun, 13 Apr 2008 13:34:16 -0400, Ed Huntress wrote:


"Michael Gray" wrote in message
news
I have recently acquired some Carborundum/Silicon Carbide in 1 lb. jars.
The labels indicate:

1F RA
2F RA
180 GG
220 RA
400 RA

The last 3 are pretty straightforward, but what do the first 2 mean and
what does the RA/GG indicate? Any knowledge of possible grit sizes in
microns? These jars were manufactured by the Canadian Carborundum
Company of Niagara Falls, Canada (the cheap electricity?). Mike in BC

Scroll to near the bottom:

http://www.metalfinishingsystems.com/tt-abrasive.html

'Dunno about the GG and RA.

Thanks Ed, hadn't seen that one before - very useful
Mike in BC

On Sun, 13 Apr 2008 13:34:16 -0400, with neither quill nor qualm, "Ed
Huntress" quickly quoth:


"Michael Gray" wrote in message
news
I have recently acquired some Carborundum/Silicon Carbide in 1 lb. jars.
The labels indicate:

1F RA
2F RA
180 GG
220 RA
400 RA

The last 3 are pretty straightforward, but what do the first 2 mean and
what does the RA/GG indicate? Any knowledge of possible grit sizes in
microns? These jars were manufactured by the Canadian Carborundum Company
of Niagara Falls, Canada (the cheap electricity?).
Mike in BC

Scroll to near the bottom:

http://www.metalfinishingsystems.com/tt-abrasive.html

'Dunno about the GG and RA.

Are those Canuckistani for "Gritty Gunk" and "Raggedy Ass", perhaps?
chortle

--
Save the whales! Trade them for valuable prizes.

"Larry Jaques" wrote in message
...
On Sun, 13 Apr 2008 13:34:16 -0400, with neither quill nor qualm, "Ed
Huntress" quickly quoth:


"Michael Gray" wrote in message
news
I have recently acquired some Carborundum/Silicon Carbide in 1 lb. jars.
The labels indicate:

1F RA
2F RA
180 GG
220 RA
400 RA

The last 3 are pretty straightforward, but what do the first 2 mean and
what does the RA/GG indicate? Any knowledge of possible grit sizes in
microns? These jars were manufactured by the Canadian Carborundum
Company
of Niagara Falls, Canada (the cheap electricity?).
Mike in BC

Scroll to near the bottom:

http://www.metalfinishingsystems.com/tt-abrasive.html

'Dunno about the GG and RA.

Are those Canuckistani for "Gritty Gunk" and "Raggedy Ass", perhaps?
chortle

....in which Larry takes a little leak into the reservoir of human
knowledge...

On Sun, 13 Apr 2008 23:55:59 -0400, with neither quill nor qualm, "Ed
Huntress" quickly quoth:


"Larry Jaques" wrote in message
.. .
On Sun, 13 Apr 2008 13:34:16 -0400, with neither quill nor qualm, "Ed
Huntress" quickly quoth:

'Dunno about the GG and RA.

Are those Canuckistani for "Gritty Gunk" and "Raggedy Ass", perhaps?
chortle

...in which Larry takes a little leak into the reservoir of human
knowledge...

Jes doin' my part, maam.

--
It is better to wear out than to rust out.
-- Bishop Richard Cumberland