To test the phosphate resistance of the eight glass samples.
Date Run:
08/14/2007
Experiment Procedure:
Glass samples were delivered polished to the specified polishing conditions. Each glass sample was weighed using a analytical balance. One sample of each glass type were hung by platinum wire into 0.01 mol/liter purified tripolyphosphate at 50 deg C for the length of times specified (15 minutes, 1 hour, 4 hours or 16 hours). After this treatment, the samples were weighed again and the loss of the mass of the sample were calculated. Calculation of the time t0.1 in hours, necessary to etch a surface layer a depth of 0.1 um was done using the following formula:
t0.1 = (tedS)/[(m1-m2)*100]
where:
t0.1 = the time (min) necessary to etch a surface layer to a depth of 0.1 m
te = the time (min) for attach in the experiment
d = the specific gravity of the sample
S = the surface area (cm2) of the sample
m1 = the mass (mg) of the sample before the test m2 = the mass (mg) of the sample after the test
Phosphate Resistance Class PR 1 2 3 4 Time t0.1 needed to etch to a depth of 0.1um/min >240 240~60 60~15 <15
In addition, changes in the surface of the sample following the treatment are qualitatively evaluated with the naked eye. Additional classification numbers are given according to the second table.
Additional Number Changes in the Surface
.0 No visible changes
.1 Clear, but irregular surface (wavy, pockmarked)
.2 Interference colors (slight selective leaching)
.3 Tenacious thin whitish layer (stronger selective) .4 Loosely adhering thick layer (surface crust)
Trial Results:
The target weight loss of 0.0010 grams (1 mg) was met by samples D and 4 after 60 minutes. The other 6 samples lost less than this weight. The tables list the amount of weight loss after each time interval. For the 60-minute time with D and 4 exceeding the weight loss, the calculations for t0.1 are included.
Time (te)
15
Test sample id
m1
m2
m1-m2
PR
A
3.8018
3.8015
0.0003
PR
B
3.8598
3.8592
0.0006
PR
C
3.7988
3.7992
-0.0004
PR
D
4.0823
4.0819
0.0004
PR
1
6.379
6.3792
-0.0002
PR
2
1.2353
1.2353
0
PR
3
1.231
1.2312
-0.0002
PR
4
1.2577
1.2576
0.0001
Time (te)
60
Test sample id
m1
m2
m1-m2
PR
A
3.8018
3.8015
0.0003
PR
B
3.8598
3.8592
0.0006
PR
C
3.7988
3.7983
0.0005
PR
D
4.0823
4.0808
0.0015
PR
1
6.379
6.3788
0.0002
PR
2
1.2353
1.2348
0.0005
PR
3
1.231
1.2307
0.0003
PR
4
1.2577
1.2561
0.0016
.
t0.1
density(d)
surface area(S)
d*S
time(te)
te*d*S
te*d*S/[(m1-m2)*100]
D
2.76
45.662
126.027
60
7561.627
50410.848
4
2.23
42.327
94.389
60
5663.368
35396.05
Dt0.1 = 50410 min
4t0.1 = 35400 min
Time (te)
240
Test sample id
m1
m2
m1-m2
PR
A
3.8018
3.8012
0.0006
PR
B
3.8598
3.8592
0.0006
PR
C
3.7988
3.7983
0.0005
PR
1
6.379
6.3789
0.0001
PR
2
1.2353
1.2348
0.0005
PR
3
1.231
1.2304
0.0006
Time (te)
1080
Test sample id
m1
m2
m1-m2
PR
A
3.8018
3.801
0.0008
PR
B
3.8598
3.8592
0.0006
PR
C
3.7988
3.7981
0.0007
PR
1
6.3791
6.3787
0.0003
PR
2
1.2353
1.2348
0.0005
PR
3
1.231
1.2309
0.0001
Phosphate Resistance and Change in Surface Classifications for all eight samples.
A
PR 1.1
B
PR 1.1
C
PR 1.1
D
PR 3.1
1
PR 1.0
2
PR 1.1
3
PR 1.1
4
PR 3.1
Success Rating:
A cleanliness study, addressing only various analytical techniques.
Conclusion:
Only one sample set, D and 4 exceeded the 1 mg weight loss. The other samples except sample 1 had some signs of etching around the edges, resulting in the .1 being added to the Phosphate resistance class.
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