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ASTM E287-02(2012)

Заменен
Standard Specification for Laboratory Glass Graduated Burets — 3 стр.
Реферат

This specification covers requirements for glass burets of precision and general-purpose grades suitable for laboratory use. Burets are classified as: class A - precision grade buret, and class B - general purpose burets. Burets shall be calibrated to deliver the intended volume at 20�C. No after-drainage period is allowed. Self-zeroing burets shall have an ungraduated, tapered, interior extension that terminates with an overflow orifice. Burets may be equipped with a filling tube. All burets shall have permanently attached stopcocks. The stopcock's handle shall be located to the right. Stopcock plugs shall be provided with a retaining device.

Область применения

1.1 This specification covers requirements for glass burets of precision and general-purpose grades suitable for laboratory use.

1.1.1 Class 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.

TABLE 1 Requirements for Burets

 

 

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

A Straight burets only, not applicable to self-zeroing burets.TABLE 2 Minimum Delivery Time for Class A Burets Using Water

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


1.1.2 Class 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.

Note 1The Twelfth General (International) Conference on Weights and Measures redefined the litre as a “special name for the cubic decimetre,” but agreed to permit continuance of the terms litre, millilitre, and mL, except in association with measurements of the highest precision. For volumetric glassware the difference between the old and new meanings of litre is negligible. Therefore, either mL or cm3 may be marked on ware covered by this standard.TABLE 3 Minimum Delivery Time for Class B Buret Using Water

Capacity, mL

Time of Outflow Not Less
Than, s

 10

25

 25

30

 50

50

100

90


1.1.3 Product 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.

ICS
71.040.20 Laboratory ware and related apparatus / Лабораторная посуда и сопутствующая аппаратура
Сборник ASTM
14.04 Laboratory Apparatus; Degradation of Materials; SI; Oxygen Fire Safety / Лабораторная аппаратура; Деградация материалов; Международная система единиц СИ; Кислород и пожарная безопасность
Тематика
Laboratory Testing