GB/T 22920-2022Electrolytic capacitor paper (English PDF)
电解电容器纸
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Issued by
State Administration for Market Regulation; Standardization Administration of China
Level / Type
National · Recommended
Issue date
July 11, 2022
Implementation date
February 1, 2023
Scope
GB/T 22920-2022 is the English-translated version of 电解电容器纸.
China's national product standard for electrolytic capacitor paper. It specifies the classification, the requirements, the test methods, the inspection rules, and the marking, packaging, transport and storage of the paper used as the separator in aluminium electrolytic capacitors.
This is one of the most demanding papers made, and its job is not what a paper usually does.
In an aluminium electrolytic capacitor the dielectric is the oxide film grown on the anode foil, not the paper; the paper is the separator, and what it must do is hold the electrolyte in contact with that oxide, keep the anode and cathode foils apart, and add as little resistance as possible to the ionic path between them.
Those requirements pull against each other. A thinner, more porous paper gives lower equivalent series resistance, which is what determines the ripple current the capacitor can take and how hot it runs; a thicker, denser paper is more reliable against short circuits between the foils.
And the paper is inside a sealed component expected to last thousands of hours at elevated temperature in an electrolyte, so it has to be chemically inert and, critically, clean.
Ionic contamination is the property that governs capacitor life: chloride in particular attacks the aluminium oxide film and causes the capacitor to fail, and it can be present at levels of a few parts per million and still matter.
So the standard specifies the thickness and density and their uniformity, the air permeability, the tensile strength, the ash and the conductivity of the aqueous extract, and above all the chloride, iron and other ionic impurity limits, together with the absence of conductive particles and pinholes.
Issued on 11 July 2022 and in force since 1 February 2023, it replaces GB/T 22920-2008.
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Document preview — GB/T 22920-2022
National Standard of the People's Republic of China
- ICS
- 85.060
- Classification
- Y 32
- Replacing
- GB/T 22920-2008
Issued by: State Administration for Market Regulation; Standardization Administration of China
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Classification
- 5 Requirements
- 6 Test methods
- 7 Inspection rules
- 8 Marking, packaging, transport and storage
1 Scope
This standard specifies the classification, the requirements, the test methods, the inspection rules, and the marking, packaging, transport and storage of electrolytic capacitor paper.
The paper is not the dielectric
In an aluminium electrolytic capacitor the dielectric is the oxide film grown on the anode foil.
The paper is the separator: it holds the electrolyte against that oxide, keeps the two foils apart, and must add as little resistance as possible to the ionic path between them.
Requirements that pull against each other
Thinner and more porous gives lower equivalent series resistance - which sets the ripple current the capacitor can take and how hot it runs.
Thicker and denser is more reliable against a short between the foils.
And it lives sealed inside for thousands of hours
Hot, in an electrolyte, with no possibility of inspection - so the paper has to be chemically inert and, above all, clean.
Chloride at parts per million ends the capacitor
Ionic contamination governs life: chloride attacks the aluminium oxide film, and a few parts per million is enough to matter.
So alongside thickness, density, permeability, strength and ash, the standard fixes the conductivity of the aqueous extract and the chloride and iron limits - and requires freedom from conductive particles and pinholes.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 451.2Paper and board - Part 2: Determination of grammage
- GB/T 451.3Paper and board - Part 3: Determination of thickness
- GB/T 462Paper, board and pulps - Determination of moisture content of analytical sample
- GB/T 1545Paper, board and pulp -- Determination of acidity or alkalinity
- GB/T 12914Paper and board -- Determination of tensile properties -- Constant rate of elongation method (20mm/min)
- GB/T 10739Paper, board and pulps - Standard atmosphere for conditioning and testing
Similar standards
Editions of GB/T 22920
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 22920-2022 | Electrolytic capacitor paper | first revision | Current |
| GB/T 22920-2008 | Electrolytic capacitor paper | first issue | Superseded |
This page sells the current edition, GB/T 22920-2022. Earlier editions are listed for reference only.
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Related Standards
GB/T 10739-2023 — Paper, board and pulps - Standard atmosphere for conditioning and testing
GB/T 12914-2018 — Paper and board -- Determination of tensile properties -- Constant rate of elongation method (20mm/min)
GB/T 1545.1-2003 — Paper, board and pulp -- Determination of acidity or alkalinity
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GB/T 22920-2022
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