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Paper and board - Measurement of water contact angle by optical methods
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Basic data
| Standard ID | GB/Z 166-2026 (GB/Z166-2026) |
| Description (Translated English) | Paper and board - Measurement of water contact angle by optical methods |
| Sector / Industry | National Standard |
| Classification of Chinese Standard | Y30 |
| Classification of International Standard | 85.060 |
| Word Count Estimation | 14,156 |
| Date of Issue | 2026-02-27 |
| Date of Implementation | 2026-02-27 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/Z 166-2026: Paper and board - Measurement of water contact angle by optical methods
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
GB /Z 166-2026.Optical measurement method for water contact angle of paper and paperboard
ICS 85.060
CCSY30
National Standardization Guiding Technical Documents of the People's Republic of China
Optical measurement method for water contact angle of paper and paperboard
(ISO /T S14778.2021, MOD)
Published on 2026-02-27
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This document is a standard or guiding technical document.
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document modifies and adopts ISO /T S14778.2021 "Optical method for measuring the water contact angle of paper and paperboard". The document type has been changed from ISO.
The technical specifications have been adjusted to become my country's national standardization guiding technical documents.
Compared with ISO /T S14778.2021, this document has undergone the following structural adjustments.
---3.2 corresponds to 3.6 of ISO /T S14778.2021, and 3.3~3.6 correspond to 3.2~3.5 of ISO /T S14778.2021;
---Sections 6.2.1 to 6.2.7 correspond to sections 6.1.1 to 6.1.7 of ISO /T S14778.2021;
---10.3.1 corresponds to the suspension section of 10.3 in ISO /T S14778.2021, and 10.3.2~10.3.5 correspond to ISO /T S14778.2021.
Sections 10.3.1 to 10.3.4;
---Added 11.3.
The technical differences between this document and ISO /T S14778.2021, and the reasons therefor, are as follows.
a) The scope has been changed (see Chapter 1) to comply with the drafting rules for Chinese standardization documents;
b) ISO 186 (see Chapter 7) has been replaced with the normatively referenced GB/T 450 to adapt to my country's technical conditions and increase operability.
Actual nature;
c) ISO 187 (see Chapter 8) has been replaced with the normatively referenced GB/T 10739 to adapt to my country's technical conditions and increase operability.
Actual nature;
d) Added normative reference to GB/T 6682 (see 5.1), and removed ISO /T S13530 (see ISO /T S14778.2021).
5.1), to adapt to my country's technological conditions;
e) The water requirements (see 5.1) have been modified to suit my country's technical conditions;
f) Change the notes in 6.1.1 and 11.2 of ISO /T S14778.2021 to the main text (see 6.2.1 and 11.3) to conform to Chinese standards.
Rules for drafting standardized documents.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China National Light Industry Council.
This document is under the jurisdiction of the National Technical Committee on Standardization of Paper Industry (SAC/TC141).
This document was drafted by. China Pulp and Paper Research Institute Co., Ltd., China Light Industry Paper Products Inspection and Certification Co., Ltd., and China Light Industry (Jinjiang) Sanitary Paper Products Co., Ltd.
Product Research Co., Ltd.
The main drafters of this document are. Yuan Taojing, Lü Xia, Li Na, Xie Jinglei, Feng Yafang, and Wang Xinting.
Optical measurement method for water contact angle of paper and paperboard
1 Scope
This document describes a method for measuring the contact angle between water and paper and paperboard surfaces using optical methods.
This document applies to most types of paper and paperboard.
This document does not apply to highly absorbent paper and paperboard with uneven surfaces.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 450 Paper and paperboard specimen collection and determination of longitudinal and transverse directions, front and back sides of specimens (GB/T 450-2008, ISO 186.
2002, MOD)
GB/T 6682 Specifications and test methods for water used in analytical laboratories (GB/T 6682-2008, ISO 3696.1987, MOD)
GB/T 10739 Standard atmospheric conditions for the treatment and testing of paper, paperboard and pulp specimens (GB/T 10739-2023, ISO 187.
2022, MOD)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
baseline
The contact line between the droplet and the surface of paper or cardboard is determined by optical methods and used as a reference plane for measuring the contact angle.
Note. Accurate contact angle measurements are based on a precise baseline. To obtain the optimal baseline, adjust the camera's tilt angle to a slightly tilted position.
When observing a droplet, it is usually viewed at an angle of 0° to 3° to the horizontal plane, rather than directly from the side (0°). Experience shows that small changes in the viewing angle do not affect the effect.
It measures the contact angle value, but can improve the accuracy of baseline identification.
3.2
Three-phase point
The intersection of the three boundary lines. liquid/solid, liquid/gas, and solid/gas.
3.3
Contact angle
Within a specified contact time, a tangent line is drawn at the gas-liquid interface at the intersection point (3.2) of the gas, liquid, and solid phases. This tangent line and the baseline (3.1) contain liquid...
The angle between the drops.
Note. The unit is expressed in degrees (°).
3.4
Contact time
The duration of contact between the droplet and the sample surface, i.e., the time from the moment the timing device is triggered to the moment the measurement is completed.
...
