A1.00 Fire Rating Tested to GB 12955-2008

Fire-rated doors play an important role in limiting the spread of fire and protecting occupants, equipment, and building areas. For commercial, industrial, and public buildings, selecting a fire door with verified fire resistance performance is essential.

According to the type test report issued by the China National Quality Supervision and Testing Center for Fire Fighting Products (Guangdong), a steel insulated fire door manufactured by Guangxi Zonle Door Manufacturer Co., Ltd. was tested in accordance with GB 12955-2008 Fire Door and the relevant certification implementation rules.

The tested door achieved an A1.00 fire resistance rating, with a fire resistance duration of at least 1.00 hour, while meeting the specified requirements for fire insulation and fire integrity.

The tested steel insulated fire door achieved an A1.00 fire resistance rating, corresponding to at least 1.00 hour of fire resistance under the test conditions specified in GB 12955-2008.

The test report also verified key requirements including:

• Door material thickness

• Dimensional tolerances

• Door and frame fitting clearances

• Closing performance

• Opening force

• Reliability after repeated opening and closing

• Fire insulation performance

• Fire integrity performance

The tested door passed the applicable test requirements.

1. Steel Fire Rated Door Test Report Overview

The test was conducted as a type test for a steel insulated fire door.

Test Report Information

The report identifies the tested product as a steel insulated fire door and records the sample condition as intact before testing.

2. Standards Used for the Fire Door Test

The test was conducted based primarily on:

GB 12955-2008 – Fire Door

The report also references:

CCCF-CPRZ-18:2019 – Fire Protection Product Certification Implementation Rules: Fire Protection Products – Building Fire-Resistant Component Products

These standards provide the basis for evaluating important characteristics of fire doors, including dimensions, material requirements, closing performance, reliability, fire insulation, and fire integrity.

For buyers, this distinction is important.

A door being marketed as a "fire door" does not by itself demonstrate a specific fire resistance performance. A type test provides documented evidence that the tested door construction was evaluated against defined requirements.

3. What Does an A1.00 Fire Rating Mean?

The tested door achieved an A1.00 fire resistance rating.

In the test report, the fire resistance test required:

• Fire resistance duration: ≥ 1.00 h

• Average temperature rise on the unexposed surface: ≤ 140°C

• Maximum temperature rise at any point on the unexposed surface: ≤ 180°C

• Maximum temperature rise on the door frame: ≤ 360°C

During the actual test, the report recorded a fire resistance duration of 1.00 hour.

The average temperature rise on the unexposed surface was 78.5°C, while the maximum temperature rise on the unexposed surface, excluding the frame, was 101.4°C.

The maximum temperature rise on the door frame was 119.9°C.

Test Results

These results were judged qualified in the test report.

4. Fire Integrity Performance

Fire resistance is not only about temperature insulation. The integrity of a fire door is also critical.

During the test, the A1.00 requirement specified that the specimen should not develop:

• Flames lasting 10 seconds or longer on the unexposed surface

• Through-openings that allow flames or hot gases to pass through

• Conditions that allow the specified fire integrity requirements to be exceeded

The test report records that after 1.00 hour, the unexposed surface showed no sustained flame, and no through-cracks were observed during the test.

The fire integrity result was therefore judged qualified.

5. Fire Door Opening Force and Closing Performance

Fire protection performance also depends on whether a fire door can operate correctly.

The report evaluated the door's closing activity and opening force.

Opening Force

The requirement was:

Opening force ≤ 80 N

The measured opening force was:

56.0 N

Therefore, the opening force met the specified requirement.

This is important for practical use because a fire-rated door still needs to be operable during normal building use.

6. Fire Door Reliability Test

A fire door may be required to open and close repeatedly during its service life.

The test report specifies a reliability requirement after 500 opening and closing cycles.

After the repeated closing test, the fire door was required to show no:

• Loosening

• Detachment

• Serious deformation

• Closing obstruction

The tested door met the specified reliability requirement and was judged qualified.

This provides additional evidence that the tested door assembly maintained its required mechanical condition after repeated operation.

7. Steel Fire Door Material and Construction

The tested product uses a steel door construction with an insulated fire-resistant core.

According to the report, the fire door leaf uses a core material composed of:

Oxidized magnesium and magnesium sulfate

The specified density of the core material was:

300 ± 30 kg/m³

The report recorded an actual density of:

• 320.2 kg/m³ before drying

• 308.3 kg/m³ after drying

The door construction also includes steel components with specified thicknesses.

The report's technical drawings further document the tested door leaf, frame, cross-sections, component positions, and construction dimensions.

This is particularly relevant when evaluating a fire door because fire performance is related to the complete tested door assembly, rather than simply the surface material.

8. Door Material Thickness and Dimensional Tolerances

The test also evaluated the physical dimensions of the door.

The measured material thicknesses included:

The results were judged qualified.

Dimensional tolerance testing also covered:

• Door height

• Door width

• Door thickness

• Frame opening height

• Frame opening width

• Frame side flatness

The measured values were within the specified requirements.

9. Door and Frame Fitting Clearances

The relationship between the door leaf and frame is another important part of fire door performance.

The report evaluated several fitting dimensions, including:

• Clearance between door leaf and frame

• Clearance between door leaf and lower frame/floor

• Contact surface gaps between door leaf and frame

• Flatness difference between the upper frame and door leaf

For example, the measured clearance between the door leaf and frame was 2.3 mm, while the clearance between the door leaf and lower frame/floor was 4.3 mm.

The measured results were judged qualified according to the applicable requirements.

10. Why Fire Door Testing Matters for Building Projects

For architects, contractors, developers, and building material distributors, fire-rated door performance should be evaluated based on documented testing rather than product descriptions alone.

A proper evaluation should consider:

1. Fire resistance rating

Check how long the tested door can maintain the required fire resistance performance.

2. Fire integrity

The door should prevent flames and hot gases from passing through the assembly under the specified test conditions.

3. Thermal insulation

The temperature rise on the unexposed side is an important part of the fire resistance evaluation.

4. Mechanical performance

The door should be capable of closing properly and operating within the specified opening-force requirements.

5. Reliability

Repeated opening and closing performance helps evaluate the mechanical durability of the tested assembly.

6. Complete door assembly

Fire performance should be considered for the complete tested configuration, including the door leaf, frame, hardware, core material, and relevant components.

11. Applications of Steel Fire Rated Doors

Steel fire-rated doors can be used where fire compartmentation and fire-resistant door assemblies are required, subject to the applicable local building codes and project specifications.

Typical project environments may include:

• Commercial buildings

• Industrial facilities

• Warehouses

• Apartment buildings

• Office buildings

• Public buildings

• Schools

• Hospitals

• Stairwell entrances

• Fire-rated corridors

• Utility rooms

• Electrical rooms

• Equipment rooms

For international projects, the required fire rating and certification should always be checked against the building code and certification requirements of the destination market.

12. What Should Buyers Check When Purchasing Fire Rated Doors?

When sourcing fire doors from a manufacturer, buyers should not evaluate the product based only on appearance or steel thickness.

Instead, ask for documentation covering:

Fire rating

What fire resistance rating has been tested?

Test standard

Which standard was used for the test?

Test report

Is there a formal test report from a qualified testing organization?

Tested configuration

Does the proposed production door match the tested construction?

Core material

What fire-resistant core material is used?

Door leaf and frame

Are the materials and dimensions consistent with the tested configuration?

Hardware

Are hinges, locks, closers, seals, and other fire-rated components compatible with the tested assembly?

Project requirements

Does the product meet the applicable requirements of the destination market?

These questions are especially important for B2B construction projects, where documentation can be just as important as the physical product.

13. Steel Fire Rated Door Test Conclusion

The tested steel insulated fire door successfully completed the applicable type testing requirements under GB 12955-2008 Fire Door and the referenced fire protection product certification rules.

The report records qualified results for:

• Material thickness

• Dimensional tolerances

• Fitting clearances

• Closing performance

• Opening force

• Reliability

• Fire insulation

• Fire integrity

Most importantly, the tested door achieved an A1.00 fire resistance rating with a tested duration of 1.00 hour.

For projects requiring documented fire-resistant door performance, this type of test evidence provides a useful reference when evaluating product construction, specifications, and compliance documentation.

Note: Fire ratings and certification requirements vary by country, building type, and project. The test results in this article apply to the tested door configuration and should not automatically be interpreted as certification for every door size, configuration, hardware combination, or market.

Frequently Asked Questions

What is an A1.00 fire rated door?

An A1.00-rated door is a fire door tested to provide at least 1.00 hour of fire resistance under the applicable test conditions. In this report, the tested steel insulated fire door achieved a 1.00-hour fire resistance result.

What standard was used to test this fire door?

The test was conducted according to GB 12955-2008 Fire Door, together with the referenced CCCF-CPRZ-18:2019 certification implementation rules.

What material is used inside the tested steel fire door?

According to the report, the door's fire-resistant core uses oxidized magnesium and magnesium sulfate, with a specified density of 300 ± 30 kg/m³.

What was the measured opening force?

The measured opening force was 56.0 N, compared with the requirement of no more than 80 N.

Did the fire door pass the reliability test?

Yes. The report states that the door met the reliability requirements following the specified 500-cycle opening and closing test.

Does this test report mean every size of the same door has a 1-hour fire rating?

Not automatically. Fire resistance performance applies to the tested configuration. Door size, construction, core material, hardware, frame, glazing, seals, and other changes may affect applicable certification or test coverage.