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The QUV accelerated weathering tester can be used to test a variety of specimens. Coatings, plastics, and films are easily accommodated in the QUV tester using standard flat panel specimen holders. Other specimens can be mounted using specialty holders. Q-Lab also offers custom specimen holders for unique needs. All of Q-Lab’s panel holders are designed to meet the requirements of ASTM G154, ISO 4892-3, and other international standards.
1. SPECIMEN MOUNTING GUIDELINES
The QUV chamber can accommodate a variety of specimen types, but three principles should be considered when mounting specimens:
- To ensure uniformity of UV exposure, the surface of the test specimen should be in theVstandard specimen plane, 50 mm from the lamps.
- The specimens and their holders must seal off the side of the QUV tester to prevent vapor from escaping from the chamber.
- The specimens should be mounted at the wall of the chamber so that room air cools the backs of the specimens (and any backing) to cause condensation on the specimen front.
Specimens should have good thermal contact with any backer present. Highly-insulating specimens thicker than 6 mm may require special attention.
2. FLAT SPECIMEN HOLDERS
Q-Lab offers flat specimen holders in three sizes.
All sizes include an individual holder for two specimens, anodized aluminum panels, and circular retaining rings. For thicker specimens, the use of thick panel retaining clips is recommended.
Thick Panel Retaining Clips Each clip is designed to hold one specimen of approximately 6 to 19 mm (¼ to ¾") in a flat panel holder.
Tensile Bar Holder Similar to a flat panel holder, this holder includes multiple clips for exposing “dog bone” shaped polymer specimens prior to tensile strength testing. Please specify tensile bar length when ordering; maximum 200 mm (8").
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3. THREE-DIMENSIONAL(3D) SPECIMEN HOLDERS
Q-Lab offers a variety of holders designed for mounting 3D specimens, or specimens too thick to fit in a flat specimen holder.
When using 3D specimen holders, it is suggested to utilize the insulated black panel to ensure proper specimen temperature during testing.
3.1 Adjustable Quadrant Boxes
- Available in 200 mm (8") and 100 mm (4") depth
- Holds parts up to 495 mm wide by 325 mm tall.
- Adjustable, perforated mounting plate accommodates specimens from 25 mm to 200 mm thick
- Includes mounting screw to hold specimen holders in place when testing heavy specimens.
These adjustable quadrant boxes are best suited for use when testing 3D or variable-sized parts. The mounting plane can be adjusted in 6 mm increments to ensure that the specimens receive accurate and uniform irradiance, regardless of dimensions.
3.2 Natural and Artificial Wood Holder
- Exposes parts and odd-shaped specimens up to 495 × 25 × 324 mm (19.5 × 1.0 × 12.75") - (w × d × h)
- Hardware for mounting specimens is not included - Customers can provide their own hardware or order a custom specimen holder.
Note: Order four to fill a QUV tester. The QUV chamber doors should be removed when using this holder.
3.3 Large 25 mm 3D Part Holder
- Exposes parts and odd-shaped specimens up to 495 × 25 × 324 mm (19.5 × 1.0 × 12.75") - (w × d × h)
- Hardware for mounting specimens is not included - Customers can provide their own hardware or order a custom specimen holder.
These holders are made for exposing large 3D parts and thick specimens.
3.4 Small 25 mm 3D Part Holder
- Exposes parts and odd-shaped specimens up to 75 × 25 × 324 mm (3.0 × 1.0 × 12.75") - (w × d × h)
- Hardware for mounting specimens is not included - Customers can provide their own hardware or order a custom specimen holder.
These holders are made for exposing small 3D parts and thick specimens.
3.5 Small Adjustable 3D Part Holder
- Exposes parts up to 17 mm (0.7") thick and up to 75 mm (3") wide
- Height of the specimens can range from 58 mm (2.3") to 85 mm (3.37")
- Clamps are lined with silicone foam rubber.
This adjustable holder is designed to hold small items such as lenses, cosmetics, toys, artificial turf, vehicle reflectors, and other small, 3D parts.
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4. CUSTOM SPECIMEN HOLDERS
For unique applications or for specimens that cannot fit in the standard flat or 3D specimen holders, Q-Lab can make custom specimen holders for nearly any application.
No matter what is being exposed, it is critical that the front surface of the specimen is at the same distance from the lamps as the flat panel holder. This should be taken into consideration when modifying a specimen holder or creating a new specimen holder design.
Specimens may need to be modified in order to fit properly into the QUV tester. Additionally, testing large parts may require relocating the temperature sensor and the use of an insulated black panel for control of the QUV tester, as thick specimens may see higher temperatures than the standard, uninsulated black panel.
SUMMARY
FLAT SPECIMEN HOLDERS: There are 3 sizes, used for coating, plastics, and film samples. For samples thicker than 6mm, it is recommended to use Thick Panel Retaining Clips to secure the samples, or if the purpose is to test tensile strength, use Tensile Bar Holders to ensure the samples.
THREE-DIMENSIONAL(3D) SPECIMEN HOLDERS: They are designed to mount samples with complex shapes that are not suitable for flat specimen holders. The front surface of the sample must be positioned at the same distance from the lamps as with standard flat specimen holders.
CUSTOM SPECIMEN HOLDERS: For unique applications or for specimens that cannot fit in the standard or specialty holders, Q-Lab can make custom specimen holders for nearly any application. Custom specimen holders can include brackets and other modifications to hold heavy or unusual-shaped specimens, such as concrete blocks. Three-dimensional holders with customized dimensions can also be made to accommodate products like fuel tanks, beverages, shoes, and hardware.
32/7 Ly Thuong Kiet St. – Ward 08 – Tan Binh Dist. – Ho Chi Minh City
Hotline: (+84) 982 74 74 36 - 0909 282 287
1/30 Nguyen Van Vinh St. - Ward 4 - Tan Binh Dist. - Ho Chi Minh City
Tel: (84-28) 3948 22 77 - 3948 22 99 | Fax: (84-28) 38 11 72 72
Email: sales@nqaco.com