WPC Door Testing: Performance Results for Strength, Moisture, Impact and Durability

WPC doors are increasingly used in residential, commercial, hospitality and interior applications because they combine the appearance and design flexibility of traditional doors with the material characteristics of wood-plastic composites.

For B2B buyers, however, product appearance is only one part of the purchasing decision. Mechanical strength, dimensional stability, resistance to indentation, moisture content and impact performance are important factors when evaluating a WPC door supplier.

To provide objective performance data, a WPC door sample was tested by SGS-CSTC Standards Technical Services (Shanghai) Co., Ltd. The testing covered fastener withdrawal capacity, resistance to indentation, moisture content, flexural properties, density and Charpy unnotched impact strength.

This article summarizes the key test results and explains what the data means for buyers evaluating WPC doors for different projects.

WPC Door Test Report Overview

The tested product was identified as a WPC DOOR, Style No. A200-50.

The testing was conducted by SGS-CSTC Standards Technical Services (Shanghai) Co., Ltd. The report number is SHIN2401000238CM01_EN, dated February 8, 2024.

According to the report, the sample was submitted by the client and the test results apply only to the sample tested.

Test Information

The report included six main performance evaluations:

1. Withdrawal Capacity of Fasteners

2. Resistance to Indentation

3. Moisture Content

4. Flexural Properties

5. Density

6. Charpy Unnotched Impact Strength

WPC Door Test Results at a Glance

The following table summarizes the main measured values reported by SGS.

The report itself marks these results as N/A for judgment, meaning the listed numerical results should be understood as measured test results rather than a general product certification or universal pass/fail claim.

1. Fastener Withdrawal Capacity

Fastener holding performance is important for doors because hinges, handles, locks and other hardware rely on secure attachment to the door structure.

The test was conducted with reference to EN 13446:2002.

Ten specimens measuring 50 mm × 50 mm × 46 mm were tested. The screw diameter was 4.2 mm, with a threaded depth of 18 mm. The test rate was 2 mm/min.

Test Result

The average maximum withdrawal force (Fmax) was:

1,187 N

The average calculated value for withdrawal capacity was:

15.7 N/mm²

The individual maximum withdrawal forces ranged from 1,046 N to 1,367 N.

Why This Matters for WPC Doors

Door hardware creates concentrated loads around fixing points. A measurable fastener withdrawal capacity provides useful technical information when evaluating how the tested WPC material performs under mechanical loading.

For B2B projects, this type of data can be considered alongside the selected hinge, lock, handle and installation system when determining the appropriate door configuration.

2. Resistance to Indentation

Door surfaces can experience localized pressure during transportation, installation and everyday use.

The SGS test evaluated resistance to indentation according to EN 15534-1:2014+A1:2017, Clause 7.5.

The test used a 10 mm diameter indenter, with a preload of 20 N and a total load of 2,000 N applied for 25 seconds. Five specimens were tested.

Test Results

The average Brinell hardness was:

26 MPa

The average rate of elastic recovery was:

0.99%

Individual hardness values ranged from 23 to 30 MPa, while the individual elastic recovery values ranged from 0.71% to 1.40%.

These results provide quantitative reference data for the material's response to localized loading.

3. Moisture Content

Moisture content is an important characteristic when evaluating wood-based and wood-plastic composite materials.

The sample was tested according to EN 322:1993. Five specimens measuring 50 mm × 50 mm × 46 mm were evaluated after drying at 103°C.

Test Result

The measured average moisture content was:

0.3%

The individual values were 0.2%, 0.2%, 0.3%, 0.3% and 0.4%.

This provides a specific measured reference for the moisture condition of the tested WPC material at the time of testing.

It is important to distinguish this result from a claim that the complete finished door is waterproof or suitable for exterior exposure. Moisture content testing and waterproof-performance testing are different evaluations.

4. Flexural Properties

Flexural performance provides information about how a material responds when subjected to bending loads.

The WPC sample was tested with reference to EN ISO 178:2019 Method A.

The specimens measured 360 mm × 20 mm × 18 mm, with five specimens tested in each direction. The test span was 288 mm and the test rate was 7.68 mm/min.

Flexural Strength

The average flexural strength was:

• Length direction: 27.5 MPa

• Width direction: 27.2 MPa

The close results between the two directions indicate that the tested sample produced similar measured flexural strength values in both orientations.

Flexural Modulus

The average flexural modulus was:

• Length direction: 5.14 × 10⁴ MPa

• Width direction: 5.14 × 10⁴ MPa

The reported values were the same in both directions.

For project buyers, these measurements can serve as technical reference data when assessing the mechanical characteristics of the tested WPC material.

5. WPC Material Density

Density was measured according to EN ISO 1183-1:2019 Method A.

Four specimens measuring 20 mm × 20 mm × 25 mm were tested.

Test Result

The average density was:

1.020 g/cm³

The individual measurements ranged from 1.019 to 1.028 g/cm³.

Density is a useful material parameter because it helps describe the physical characteristics of the WPC composition and can be used as part of technical material comparison.

However, density alone should not be interpreted as an indicator of overall door quality. Door construction, internal structure, surface treatment, hardware and manufacturing processes also affect final product performance.

6. Charpy Unnotched Impact Strength

Doors can be exposed to accidental impacts during handling, transportation, installation and everyday use.

The tested WPC material was evaluated for Charpy Unnotched Impact Strength according to ISO 179-1:2023.

Six specimens were tested using a pendulum capacity of 25 J and an impact speed of 3.46 m/s. The reported specimen dimension was approximately 70 mm × 19.83 mm × 25.31 mm.

Test Result

The reported Charpy unnotched impact strength was:

23.7 kJ/m²

The report records the result as:

C — Complete break

This result should be interpreted specifically as the measured impact performance of the tested WPC sample under the stated laboratory conditions. It should not be presented as a claim that the complete finished door cannot be damaged by impact.

What Do These WPC Door Test Results Tell Buyers?

For B2B buyers, a laboratory report is most useful when it provides measurable technical information rather than broad marketing claims.

The SGS report provides data covering several important material characteristics:

Mechanical Performance

Fastener withdrawal and flexural testing provide quantitative information about the mechanical behavior of the tested WPC material.

Surface Response

The indentation test provides measured hardness and elastic recovery values under a defined loading condition.

Material Condition

The measured moisture content and density provide basic physical-property data for the tested sample.

Impact Performance

The Charpy test provides a standardized measurement of unnotched impact strength under the specified test conditions.

Together, these results create a more complete technical profile of the tested WPC material than a product description based only on appearance and design.

WPC Door Performance Depends on More Than Material Data

A laboratory material test is an important reference, but it should not be confused with a complete finished-door certification.

The SGS report clearly states that the results refer only to the sample(s) tested.

The actual performance of a finished WPC door can also depend on:

• Door leaf construction

• Door thickness

• Internal structure

• Surface finish

• Door frame construction

• Hinges and other hardware

• Lock and handle installation

• Manufacturing tolerances

• Installation method

• Intended application

• Environmental conditions

Therefore, project specifications should be evaluated based on the complete door system rather than a single material parameter.

WPC Doors for Residential and Commercial Projects

WPC doors can be developed in a variety of styles and configurations, making them suitable for different interior applications.

Depending on the project requirements, WPC doors can be considered for:

• Residential interior doors

• Bedroom doors

• Bathroom and utility-area doors

• Apartment projects

• Hotel interiors

• Office interiors

• Commercial buildings

• Property development projects

• Customized interior door projects

For larger projects, buyers can evaluate material data together with door dimensions, surface finish, hardware configuration, packaging, installation requirements and customization options.

Why Testing Matters When Choosing a WPC Door Supplier

For distributors, contractors, developers and project buyers, supplier selection should go beyond product photographs and catalog specifications.

A reliable evaluation process can include:

1. Product specifications

Check the door structure, dimensions, thickness, materials and available finishes.

2. Laboratory testing

Review available test reports and identify exactly which sample and test methods were used.

3. Manufacturing capability

Evaluate whether the supplier can maintain consistent production quality at the required volume.

4. Customization

Confirm whether dimensions, colors, surface designs, hardware and packaging can be customized.

5. Project support

For commercial and large-scale projects, technical communication and production coordination are equally important.

A combination of product data, testing evidence and manufacturing capability gives buyers a more practical basis for supplier evaluation.

WPC Door Testing: Key Takeaways

The SGS test report for the tested WPC door sample provides measurable results across six areas of performance.

The key figures include:

• 1,187 N average maximum fastener withdrawal force

• 15.7 N/mm² average fastener withdrawal capacity

• 26 MPa average Brinell hardness

• 0.99% average elastic recovery

• 0.3% average moisture content

• 27.5 MPa flexural strength in the length direction

• 27.2 MPa flexural strength in the width direction

• 5.14 × 10⁴ MPa flexural modulus in both directions

• 1.020 g/cm³ average density

• 23.7 kJ/m² Charpy unnotched impact strength

These figures are specific to the sample tested under the conditions described in the SGS report.

For B2B buyers, this type of test information can be used as one part of the technical evaluation process when sourcing WPC doors.

Looking for a WPC Door Manufacturer?

ZONLE Doors supplies customized door solutions for residential, commercial and project applications.

Our WPC door solutions can be developed according to project requirements, including door dimensions, surface design, color, hardware configuration and other specifications.

For distributors, contractors, developers and importers looking for a WPC door manufacturer and OEM supplier, technical requirements can be discussed before production to determine the appropriate product configuration.

Contact ZONLE Doors for WPC Door specifications, customization options and project quotations.

FAQ About WPC Door Testing

What is a WPC door?

A WPC door is a door product made using wood-plastic composite material. WPC combines wood-based components with polymer materials to create a composite material used in various building and interior applications.

How is a WPC door tested?

WPC door or WPC material performance can be evaluated through different laboratory tests depending on the intended application. The SGS report discussed in this article includes fastener withdrawal, indentation resistance, moisture content, flexural properties, density and Charpy unnotched impact strength.

What was the moisture content of the tested WPC sample?

The average moisture content reported in the SGS test was 0.3%.

What was the flexural strength of the tested WPC material?

The average flexural strength was 27.5 MPa in the length direction and 27.2 MPa in the width direction.

What was the density of the tested WPC material?

The average density reported by SGS was 1.020 g/cm³.

What was the impact strength of the tested WPC sample?

The Charpy unnotched impact strength was reported as 23.7 kJ/m² under the test conditions specified in the report.

Does this report prove that all WPC doors have the same performance?

No. The report applies to the sample tested. Different WPC formulations, constructions, dimensions, surface treatments and manufacturing processes can produce different results.

Does this test report prove that the WPC door is waterproof?

No. The report includes a moisture-content test, but it does not report a waterproof or water-resistance test for the finished door. Therefore, the report should not be used as evidence of waterproof performance.

Does this report prove that the WPC door is fire-resistant?

No. Fire resistance or fire-rating performance is not among the tests listed in this report. A separate fire test report would be required to support fire-performance claims.

Test Report Reference

Report No.: SHIN2401000238CM01_EN

Testing Laboratory: SGS-CSTC Standards Technical Services (Shanghai) Co., Ltd.

Sample: WPC DOOR

The original report contains ten pages, including sample information, test methods, measured results, original sample photographs and test photographs.

Note: The test results presented in this article are based on the specific sample and test conditions stated in the original SGS report. They should not be interpreted as universal performance guarantees for every WPC door.