VILABO – Laboratory Glassware | Av. Dr. José Henriques Vareda, nº 60 Marinha Grande 2430-037 PORTUGAL

Class A and Class B difference Laboratory glassware LINEX

May 10, 2021

Class A and Class B difference Laboratory glassware LINEX

If you use laboratory glassware you may have notice that there is some letters, namely A’s and B’s. Those stand for CL A (Class A) and CL B (Class B).
These are very important. Let’s see the difference between them:

Class A

Class A laboratory glassware are used in more accurate volumes. This is noticed if, in the glassware, there’s an A or AS.
The glasswork that had these kind of letters are mostly used for more accurate volumes.
An example of these kind of instrument is the volumetric flask.

Class B

Class B glassware is used for less accurate measurements. The mark that usually is in the glass is the B letter.
Below you can find Tables of the tolerances used in the LINEX Laboratory glasses of volumetric pipettes and volumetric flasks and class A graduated cylinders.

Class A volumetric pipettes

Class A volumetric pipette, full * or partial **, permanent graduation, color-coded, top and bottom tip calibrated and tempered, calibrated at 20ºC, according to ISO 648
Capacity ml Tolerance ml Color Code
0,5 +/-0,005 2 preto
1 +/-0,008 Azul
2 +/-0,01 Laranja
3 +/-0,015 preto
4 +/-0,015 2 vermelho
5 +/-0,015 branco
6 +/-0,02 2 laranja
7 +/-0,02 2 verde
8 +/-0,02 Azul
9 +/-0,02 Preto
10 +/-0,02 Vermelho
11 +/-0,02 Branco
15 +/-0,03 Verde
20 +/-0,03 Amarelo
25 +/-0,03 Azul
30 +/-0,04 Preto
40 +/-0,05 Branco
50 +/-0,05 vermelho
100 +/-0,08 Amarelo
200 +/-0,1 azul
*1 traço – Escoamento total

**2 traços – Escoamento parcial

 

Volumetric flasks with ground and plastic stopper class A ISO 1042

 

Capacity ml Grinded Tolerance ml
5 7/16 +/-0.025
10 7/16 +/-0.025
25 10/19 +/-0.040
50 12/21 +/-0.060
100 12/21 +/-0.100
200 14/23 +/-0.150
250 14/23 +/-0.150
500 19/26 +/-0.250
1.000 24/29 +/-0.400
2.000 29/32 +/-0.600

 

Graduated cylinders, high shape, hexagonal glass base and ISO A class n 4788 nozzle

 

Capacity ml Division Tolerance ml
5 0.1 +/-0.05
10 0.2 +/-0.10
25 0.5 +/-0.25
50 1.0 +/-0.50
100 1.0 +/-0.50
250 2.0 +/-1.00
500 5.0 +/-2.50
1.000 10.0 +/-5.00
2.000 20.0 +/-10.00