Submitting Glazing Samples for Testing

Submitting Glazing (Window type) Samples for Testing

If you plan on submitting glazings (windows) for testing, then read the following instructions and refer to the illustration below on how to prepare your glazings for testing and shipping them to Close Focus Research.

Preparing Your Glazings For Ballistic Testing

Designs That Utilize Glass Face Plys
If your glazing design utilize a glass face ply on either or both sides of the laminate, then it is recommended that you undersize the glass face plys such that there is a 0.125 to 0.250 inch offset from the edge. This will help prevent the glass face plys from breaking during both shipping and handling of the test samples.

Preventing Damage to the Glazings and Injuries to the Material Handlers
All glazing type test samples submitted to CFR should at have their perimeter edges protected with a tape or rubber-like edge seal material. If you do not utilize an edge seal, then cover all the exposed perimeter edges with heavy duty duct tape. Use a minimum tape width of 1.0 inch so that there is at least a 0.5 inch overlap on each of the glazing's edges.

All Glass, Glass / Polycarbonate, or Acrylic Designs
Depending on the laminate and lay-up configuration, there is a possibility that these types of glazings will delaminate during testing, especially if the testing includes multiple shots. If these glazings will eventually be placed in a framing system in the end-use application, then it is recommended that you submit the test samples mounted within frames as shown in the illustration below. The frames will help prevent the test samples from delamination during the testing and provide you with results that are more representative to an end-use application.

The Importance of Supplying Multiple Shot Glazing Test Samples in Metal Frames for Testing
The following page provides some photographs illustrating the difference between testing multiple-shot test samples with and without frames. Mounting Glazing Test Samples in Metal Frames for Testing.


Test Sample Identification
Place the identification labels in any corner of the test samples and make sure you indicate on the samples which side is the impact side.. Do not place the labels within the target area. Placing labels within the target are may affect the test results especially if spall is being considered as part of the tests. The label should include the following information as shown in the illustration below.


Preparing Your Glazings For Shipping To Close Focus Research
The most cost effective and efficient way to prepare you samples for shipping is to position them vertically within the shipping container using styrofoam separators between each glazing sample. If you plan on having your test samples returned after testing, than allow extra space in the container for the post-tested samples to fit within the container. In most cases, after the samples have been tested, they end up being thicker than they were in the pre-test configuration due to bulges and other deformation effects. This is why you need to supply the extra space in the shipping container so that they will all fit within the same container for return shipping.


Shipping Your Glazings To Close Focus Research
The shipping container must have easy access to being opened. Do not use nails or glue in the areas where the samples are to be removed and repacked into the container. Latches are preferred but American Phillips head style screws are acceptable.


If you want your test samples returned, then ship the samples in a reusable shipping container that provides enough room to repack post-tested deformed samples. In most cases, after the samples have been tested, they end up being thicker than they were in the pre-test configuration due to bulges and other deformation effects. This is why you need to supply the extra space in the shipping container so that they will all fit within the same container for return shipping.

Submitting Glazings For UL 752 Ballistic Testing
The official UL 752 testing procedure requires three (3) identical samples tested to the same level including Parts 1, 2, and 3 if applicable. The general sample size is 12 x 12 inches. For assemblies and special circumstances, the sample size may vary. Keep in mind that Close Focus Research can test to any custom plan including the number of test samples. For more detailed information, see the following page: What is Required for UL 752 Ballistic Testing?

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