1.1This specification covers requirements for glass burets of precision and general-purpose grades suitable for laboratory use.
1.1.1Class A-Each buret of precision grade may be marked with the letter “A” to signify compliance with applicable construction and accuracy requirements in Table 1 and Table 2. Each buret may be marked with a permanent serial number at the option of the manufacturer.
|
Graduated Scale |
|||||||
|
Capacity, mL |
Subdivision, mL Class A and B |
Class A Scale Length, mm 0 to Capacity |
Class B Scale Length, mm 0 to Capacity |
Distance, Top of Buret to “0” Graduation, mmA |
Class A and B Number Each, mL |
Class A Volumetric Tolerance, ±mL |
Class B Volumetric Tolerance, ±mL |
|
10 |
0.05 |
350 to 450 |
250 to 450 |
30 to 75 |
0.5 |
0.02 |
0.04 |
|
25 |
0.1 |
350 to 450 |
250 to 450 |
30 to 75 |
1 |
0.03 |
0.06 |
|
50 |
0.1 |
500 to 600 |
500 to 600 |
40 to 100 |
1 |
0.05 |
0.10 |
|
100 |
0.2 |
550 to 650 |
550 to 650 |
40 to 100 |
2 |
0.10 |
0.20 |
|
Length Graduated, cm |
Time of Out- flow Not Less Than, s |
Length Graduated, cm |
Time of Out- flow Not Less Than, s |
|
15 |
30 |
45 |
80 |
|
20 |
35 |
50 |
90 |
|
25 |
40 |
55 |
105 |
|
30 |
50 |
60 |
120 |
|
35 |
60 |
65 |
140 |
|
40 |
70 |
70 |
160 |
1.1.2Class B-General purpose burets are of the same basic design as Class A burets. However, volumetric tolerances for Class B burets shall be within twice the specified range allowed for Class A burets. These burets need not be marked with their class designation or serial number. See Table 1 and Table 3 for tolerances and dimensional requirements.
|
Capacity, mL |
Time of Outflow Not Less Than, s |
|
10 |
25 |
|
25 |
30 |
|
50 |
50 |
|
100 |
90 |
1.1.3Product with a stated capacity not listed in this standard may be specified Class A Tolerance when product conforms to the tolerance range of the next smaller volumetric standard product listed in Table 1.
