ASTM E1092-91(2022)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E1092 −91 (Reapproved 2022)
Standard Specification for
Glass Micro Folin Pipet, Disposable
This standard is issued under the fixed designation E1092; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 coeffıcient of variation, n—theexpecteddistributionof
individual volumes around the mean volume.
1.1 This specification covers a glass disposable micro Folin
pipet suitable for use in micro techniques for estimation of 3.1.3 disposable, n—micro Folin pipets that are intended to
blood sugar by the Folin method. be used once only and then discarded.
1.2 The values stated in SI units are to be regarded as
NOTE 1—Such pipets will only be expected to provide their specified
standard. No other units of measurement are included in this performance during the original operation.
standard.
4. Classification
1.3 The following precautionary statement pertains only to
the test method portion, Section 8, of this specification. This 4.1 This specification covers only one glass pipet as illus-
standard does not purport to address all of the safety concerns,
trated in Fig. X1.1.
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety, health, and
5. Materials and Manufacture
environmental practices and determine the applicability of
5.1 The pipet shall be made of borosilicate glass, Type 1,
regulatory limitations prior to use.
Class B, or soda lime glass, Type 2, in accordance with
1.4 This international standard was developed in accor-
Specification E438.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6. Physical Properties
Development of International Standards, Guides and Recom-
6.1 Design—The micro Folin pipet shall be made of one
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. piececonstructionglasstubingthatisstraightanduniformbore
with a point pulled on one end to the dimensions as specified
2. Referenced Documents
in Fig. X1.1.
2.1 ASTM Standards:
6.2 Dimensions—The pipet shall be made of tubing with an
E438 Specification for Glasses in Laboratory Apparatus
outside diameter (o.d.) of 2.5 6 0.1 mm with an inside
2.2 ISO Standard:
diameter (i.d.) of 1.8 6 0.1 mm. The uniformity of the bore
1769 Laboratory Glassware—Pipettes—Color Coding
shall be 60.05 mm throughout the straight portion of the pipet.
The pipet shall be 183 6 1 mm long with all dimensions and
3. Terminology
tolerances as shown in Fig. X1.1.
3.1 Definitions of Terms Specific to This Standard:
6.3 Capacity—The pipet shall be calibrated “to contain”
3.1.1 accuracy, n—the expected distribution of mean vol-
(T.C.) 0.1 and 0.2 mL at 20 °C. Marking shall be as specified
umes around the stated volume.
in 6.5.
6.3.1 Accuracy (see 3.1.1)—The accuracy from stated vol-
ume shall be 61.0 % for the 0.1 and 0.2-mLcapacity and shall
This specification is under the jurisdiction of ASTM Committee E41 on
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
be determined as specified in 8.1.
Laboratory Ware and Supplies.
6.3.2 Coeffıcient of Variation (see 3.1.2)—The coefficient of
Current edition approved Jan. 1, 2022. Published February 2022. Originally
variation from stated volume for the 0.1 and 0.2-mL capacity
approved in 1986. Last previous edition approved in 2016 as E1092 – 91(2016).
DOI: 10.1520/E1092-91R22.
shall not exceed 1.25 % and shall be determined as specified in
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
8.1.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
6.4 Graduation Lines—The pipet shall be calibrated and
the ASTM website.
marked with graduation lines at 0.1 and 0.2 mLfrom the tip of
Available from International Organization for Standardization (ISO), 1, ch. de
the pipet.The graduation lines shall be 0.3 6 0.1 mm and shall
la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http://
www.iso.ch. completely encircle the tube.
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E1092 − 91 (2022)
6.5 Pipet Nomenclature—The pipet shall be marked with v 5 W 3Z (1)
0.1 and 0.2-mL markings slightly above the graduation lines.
where:
The pipet may be marked with the inscription TC 20°C, or the
W = apparent mass of liquid (water), weighed in air, and
manufacturer’s or vendor’s name or trademark, or both.
Z = apparent specific volume of liquid (water).
6.6 Color Coding—The pipet shall be color coded for
Values of Z for water are given in the appendix.
capacity as specified in ISO Standard 1769 with an “orange”
colorbandthatis6 62mmwideandlocated16 62mmfrom 8.3 Capacity Deviation (single pipet)—In accordance with
the top of the pipet as shown in Fig. X1.1. the methods outlined, capacity deviation is the difference
between the stated capacity and the observed capacity of the
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