Frit Tests for Glass Compatibility
FRITS There were 3 frits where 2 different source bags were available, F2, 3110, and F75. Both sources were tested. The frits tested were from Ferro (3292, 3124, 3278, 3134, 3293, 3110, and 3269), and Fusion (F2, F12, and F75). The approximate size of the buttons on all test pieces (post firing) is approximately 1 cm diameter. All clay based tests were conducted on Tuckers Mid Smooth Stone clay, 4 - 6 mm thickness, bisqued to cone 06. Glass is tinted float glass, single layer, 4 mm thickness.
700 C This test was conducted on bisque fired cone 6 stoneware. These two tests were fired flat on the shelf.

800 C

This test was conducted on both bisque fired cone 6 stoneware and single thickness tinted float glass. The two images of the float glass are of the same piece with different lighting conditions to show the opacity, translucency, or transparency of the various frits on this glass. None of the frits showed any movement in this test. this piece of bisque was fired standing up in order to show movement if the frit melted sufficiently to flow.

 

850 C As with the 800 C test, this was also conducted on both bisque and tinted glass.

 
Cone 06 This test was conducted on bisque fired cone 6 stoneware. At this temperature, frits 5 to 7 inclusive and 13 appeared to show some movement/flow as these tiles were fired standing upright

Cone 7

 This test was conducted on bisque fired cone 6 stoneware. Many of the frit buttons showed an area of shine around the button. It is expected that this indicates either migration of solubles from the frit through the bisque prior to firing or more likely "spray/fuming" of a component of the frit during firing. The frit with the least surrounding shiny area is frit 1 as can be seen by the amount of marker remaining to stain the underlying clay. This test was fired flat on the shelf.

 

Frit Test 1 2 3 4 5 6 7 8 9 10 11 12 13
  3292 F2 (1) F2 (2) 3124 3278 3134 F12 3293 3110 (1) 3110 (2) F75 (1) F75 (2) 3269
700C very dry and fell off clay very dry very dry very dry partly glossy but bubbles not healed over. No visible crazing. glossy. crazed. glossy. crazed. frit button not fully flattened like others that melted. between satin and dry. bubble hole in center mostly glossy. No crazing satiny. 1 craze line. glossy. no crazing glossy. 2 craze lines glossy. a few cracks
800C very dry very dry very dry very dry, but whiter looking than samples 1, 2, and 3. matt surface with a hint of shine. multiple cracks matt surface with multiple cracks matt surface with multiple cracks matt surface with a few cracks glossy with a few cracks satin with a few cracks satin with 2 craze lines satin with a few cracks glossy with multiple cracks
800C on glass glossy surface with slight pinholing. Semi translucent. glossy surface with slight pinholing.  translucent. glossy surface with no pinholes. Almost transparent. glossy surface. Opague. satiny surface. Semi-translucent. matt surface. Opague satin surface with very tiny pinholes. semi translucent. satin surface with very tiny pinholes. almost opague. glossy surface. Almost transparent. a few craze lines within the very top layer where the frit button was. Crazing does not extend into the base glass. glossy surface. Almost transparent. a few craze lines within the very top layer where the frit button was. Crazing does not extend into the base glass. glossy surface. Almost transparent. possible start of crazing visible weeks post firing glossy surface. Almost transparent. possible start of crazing visible weeks post firing. glossy surface. Almost transparent. possible start of crazing visible weeks post firing.
extent of stress field in glass when viewed through a polarizing filter 1- stress field visible 2- extensive stress field visible 3- stress field visible 4- minor stress field visible 5-no visible stress 6- no visible stress 7- no visible stress 8- no visible stress 9-slight stress seen at craze lines 10- slight stress seen at craze lines 11- slight stress seen at craze lines 12- slight stress seen at craze lines 13- minor stress field visible
Frit Test 1 2 3 4 5 6 7 8 9 10 11 12 13
  3292 F2 (1) F2 (2) 3124 3278 3134 F12 3293 3110 (1) 3110 (2) F75 (1) F75 (2) 3269
850 C satin finish. No crazing glossy, clear, no crazing glossy, clear, no crazing satiny matt, no crazing glossy, clear, crazed. 1 delayed craze line (since this picture) smooth matt, crazed uneven surface with some gloss in areas. thicker in center and milky. crazed almost glossy. No crazing glossy, clear, some crazing. 1 delayed craze line (since this picture) glossy, 1 craze line satin. 1 craze line satin. no crazing glossy, clear, crazed. A few lines of delayed crazing
850 C on glass not fully melted. milky. feels concave. Satiny gloss surface. minor stress. fully melted. slightly translucent. visible stress field fully melted. almost transparent. visible stress field not fully melted. white. feels concave. satiny mall surface. minor stress fully melted. slightly translucent. no stress. not fully melted. white. feels concave. matt surface. no stress almost melted. greyish appearance. surface seems bumpy. no stress not fully melted. milky. satin surface. no stress not fully melted. greyish appearance. satin surface. slight stress not fully melted. greyish appearance. satin surface. slight stress not fully melted. greyish appearance. almost fully glossy surface. very slight stress. not fully melted. greyish appearance. almost fully glossy surface. very slight stress. fully melted. transparent. glossy surface. no stress.
Cone 06 satin surface. Appears to be opague. 1 craze line. glossy surface. transparent. crazed glossy surface. transparent. crazed satin surface. appears to be semi transparent. Crazed glossy. transparent. heavily crazed glossy. transparent. heavily crazed glossy. transparent. heavily crazed glossy edges with matt center surface. transparent. Crazed. matt surface, transparent. heavily crazed matt surface, transparent. heavily crazed glossy surface. transparent. crazed mostly glossy surface with center lower section satiny. transparent. crazed. glossy surface. transparent. heavily crazed
Cone 7 glossy, transparent, with some tiny bubbles glossy, transparent with unhealed bubbles glossy, transparent with unhealed bubble glossy, transparent with unhealed bubble. Some tiny bubbles within frit button. glossy, opague glossy, opague, unhealed bubbles glossy, opague, unhealed bubble glossy, transparent, unhealed bubbles, crazed where ink appears to have seeped down under frit button and stained around the craze line (or extensive hairline crazing around each major craze line) glossy, transparent, unhealed bubbles, crazed where ink appears to have seeped down under frit button and stained around the craze line (or extensive hairline crazing around each major craze line) glossy, transparent, unhealed bubbles, crazed where ink appears to have seeped down under frit button and stained around the craze line (or extensive hairline crazing around each major craze line) glossy, transparent, unhealed bubbles, crazed where ink appears to have seeped down under frit button and stained around the craze line (or extensive hairline crazing around each major craze line) glossy, transparent, unhealed bubbles, crazed where ink appears to have seeped down under frit button and stained around the craze line (or extensive hairline crazing around each major craze line) glossy, transparent, unhealed bubbles, crazed where ink appears to have seeped down under frit button and stained around the craze line (or extensive hairline crazing around each major craze line)
Frit Test 1 2 3 4 5 6 7 8 9 10 11 12 13
  3292 F2 (1) F2 (2) 3124 3278 3134 F12 3293 3110 (1) 3110 (2) F75 (1) F75 (2) 3269

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