Last updated: 13 November 2026.
Direct answer. China's registry returns 30 records for 密封件: 21 current and 9 abolished. Only one current record is mandatory — GB 16807-2025 on fire-expanding seals, effective 1 August 2026. Hydraulic dimensions sit in GB/T 15242 and GB/T 36520, and rubber seals are specified per application rather than as one family.
A sealing drawing usually names one standard, and the choice is narrower than the size of the field suggests. The query below is deliberately literal: the single term 密封件, run against the State Administration for Market Regulation registry on 13 November 2026, returning 30 rows with no shortfall across three pages.
That term is not the same as "seal" in English usage. It covers fire-expanding strips for building joints, pipe-joint gaskets, hydraulic rod seals and one lightning-protection component, because all of them are 密封件 in Chinese. Reading the result set as one technology is the first mistake; the second is assuming the count reflects what is available, when 9 of the 30 rows are already dead.
| State | Records | Of which mandatory |
|---|---|---|
| Current | 21 | 1 |
| Abolished | 9 | 2 |
| Total | 30 | 3 |
By nature the same 30 rows split 27 recommended (GB/T) to 3 mandatory (GB). Every mandatory row is the same product family at three generations, which is why the "mandatory seal standard" question has a short answer: one live document.
`GB 16807-2025` — 防火膨胀密封件, fire-expanding seals — was issued on 1 August 2025 and takes effect on 1 August 2026. Its two predecessors, `GB 16807-1997` and `GB 16807-2009`, are both recorded as abolished.
Two things follow for a buyer. First, if a drawing for fire-rated doors or curtain-wall joints still cites the 2009 version, it cites a dead document, and the gap is not cosmetic: the 2025 edition replaced it outright rather than amending it. Second, the effective date matters for scheduling — until 1 August 2026 the 2009 text was the operating document, so a supplier quoting "GB 16807" without a year is not telling you which one they mean.
What the registry does not give is any of the content: no expansion ratio, no temperature curve, no test duration. Those live behind the paid full text, and this page does not reproduce them.
Two recommended standards were reissued on the same day, 31 October 2025, both effective 1 May 2026:
| Current record | Replaced | Subject |
|---|---|---|
| `GB/T 21873-2025` | `GB/T 21873-2008` (abolished) | Rubber seals — joint sealing rings for water supply, drainage and sewerage pipes — material specification |
| `GB/T 27572-2025` | `GB/T 27572-2011` (abolished) | Rubber seals — joint sealing rings for 110 °C hot-water supply pipes — material specification |
The 110 °C in the second title is part of the standard's name, not a recommendation about your line. Both documents are material specifications, which means they constrain the compound rather than the groove: a supplier can meet the material clause and still deliver a ring that does not fit.
A third family moved earlier in 2025: `GB/T 33588.5-2025` (issued 25 April 2025, effective 1 November 2025) replaced both the 2020 and the 2017 editions, which the registry now records as abolished.
If your drawing is for a cylinder rather than a pipe joint, the relevant current records are dimension standards, and they are split by seal type rather than by industry:
| Family | Current records | What they fix |
|---|---|---|
| Coaxial seals for piston and rod | `GB/T 15242.1-2017`, `GB/T 15242.3-2021` | Dimensions and tolerances; housing groove dimensions and tolerances |
| Polyurethane seal series | `GB/T 36520.1-2018`, `.2-2018`, `.3-2019`, `.4-2019` | Piston rings, rod rings, wipers and cylinder-mouth rings — dimensions and tolerances |
| Performance evaluation | `GB/T 32217-2015` | Test method for assessing reciprocating hydraulic seals |
Both 1994 parts of the `GB/T 15242` series are recorded as abolished, so a drawing written in the 1990s style is now two generations out of date on dimensions alone. Note also that `GB/T 32217-2015` was issued on 10 December 2015 but only took effect on 1 January 2017 — a reminder that issue and effective dates in this registry can be more than a year apart, and that either one can be the date a contract means.
Seven current records are product standards for a named application. They are not interchangeable, and none of them is a general "rubber seal" specification:
| Record | Application named in the title |
|---|---|
| `GB/T 28604-2012` | Rubber seals for domestic drinking-water piping systems |
| `GB/T 21874-2008` | Elastomer seals for drainage pipe joints — thermoplastic elastomer material requirements |
| `GB/T 24798-2009` | Rubber seals for solar water-heating systems |
| `GB/T 30912-2014` | Rubber seals for automotive hydraulic disc brake cylinders |
| `GB/T 36879-2018` | Rubber seals for full-face tunnel boring machines |
| `GB/T 23662-2022` | Rubber seals for concrete road expansion joints |
| `GB/T 37996-2019` | Rubber seals for power lithium-ion batteries |
Two further current records sit adjacent rather than inside this group: `GB/T 22218-2008` and `GB/T 22219-2008` cover the fire resistance of metal pipe fittings fitted with elastic seals on ships and offshore units — a test method and a test-rig requirement, not a seal specification.
The practical point is that "we use GB rubber" is not a specification. The application in the title decides which document applies, and a supplier who offers a drinking-water seal for a brake cylinder is quoting the wrong family even if the compound looks similar on a data sheet.
`GB/T 33588.5` is titled, in translation, "Lightning protection system components (LPSC) — Part 5: Requirements for earth electrode inspection housings and earth electrode seals". It appears in this result set because its Chinese title contains the same word. It is electrical earthing hardware, not a fluid seal.
Three of the 30 rows are this family — the 2017, 2020 and 2025 editions — and only the 2025 one is current. If you are counting "seal standards", the honest count is 27 records about fluid or joint sealing and 3 about earthing inspection boxes.
Before you put a number on a drawing, decide which of the three questions you are answering: a material specification (what the compound must be), a dimension standard (what the groove and the ring must measure), or a product standard for a named application. The registry separates them; a quotation often does not.
Seals rarely travel alone in a bill of materials, which is why the dimension records above are worth reading next to the hydraulic cylinder page — the groove tolerances are the same problem seen from the cylinder side — and the valve page, where the seal sits between the body and the seat. If you need the wider map of how GB, GB/T and GB/Z records are classified, the GB standards explainer covers it.
The registry returns 30 records for 密封件 as at 13 November 2026: 21 current and 9 abolished. Three records are mandatory and only one of those is still current, GB 16807-2025.
Only GB 16807-2025, 防火膨胀密封件 (fire-expanding seals), issued 1 August 2025 and effective 1 August 2026. Its 1997 and 2009 predecessors are both recorded as abolished.
Dimensions sit in GB/T 15242.1-2017 and GB/T 15242.3-2021 for coaxial seals, and in the GB/T 36520 series for polyurethane piston, rod, wiper and cylinder-mouth seals. Performance testing is GB/T 32217-2015.
No. The current records are written per application: drinking-water pipes, drainage pipes, solar water heaters, lithium batteries, brake cylinders and tunnel boring machines each have their own material or product record.
GB/T 33588.5 covers grounding electrode inspection boxes and their seals in lightning protection systems. It is electrical equipment, not a fluid seal, and the registry matches it on the word 密封件 alone.
All sources retrieved 13 November 2026. This page is an independent reading of the sources listed; the official pages themselves are the specification.
| Fact used on this page | Source |
|---|---|
| S1 — All 30 records: code, title, nature, state, issue date and effective date; page 1 of 3, 10 rows | SAMR national standards registry, 13 November 2026 https://std.samr.gov.cn/gb/search/gbQueryPage?searchText=%E5%AF%86%E5%B0%81%E4%BB%B6&pageNumber=1&pageSize=10 |
| S2 — Records 11 to 20 of the same 30-row result set | SAMR national standards registry, 13 November 2026 https://std.samr.gov.cn/gb/search/gbQueryPage?searchText=%E5%AF%86%E5%B0%81%E4%BB%B6&pageNumber=2&pageSize=10 |
| S3 — Records 21 to 30; 30 unique standard codes retrieved against a reported total of 30, no shortfall | SAMR national standards registry, 13 November 2026 https://std.samr.gov.cn/gb/search/gbQueryPage?searchText=%E5%AF%86%E5%B0%81%E4%BB%B6&pageNumber=3&pageSize=10 |