Polariscope COE Test Card

Polariscope COE Test Card

SKU: COETESTCARD

5.0
Rated 5.0 out of 5 stars
1 Review
$12.00
/
Shipping calculated at checkout.
Take the guesswork out of COE compatibility—check for stress fast and save your next firing from an avoidable failure.
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Description:

Item Name:

Polariscope COE Test Card

SKU:

COETESTCARD

Description:

The Polariscope COE Test Card is a simple compatibility checker used to spot stress from mismatched glass in fused work. It’s made to be used with a light source by sandwiching your fused glass piece between the backlit films on the card. When the glass is compatible, you will not see a halo. If a halo appears, it indicates stress in the glass and signals incompatibility, helping you catch COE mismatch issues before they become cracks or failures in service.

How it is used:

  • Place the test card on a bright, even light source such as a bright flashlight
  • Sandwich the fused glass piece between the backlit films
  • Look for a halo pattern
  • No halo indicates compatibility
  • A visible halo indicates stress and likely incompatibility
5.0
Rated 5.0 out of 5 stars
Based on 1 review
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
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1 review
  • JP
    Jeff P.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 days ago
    Really works very well, and a great teaching tool!

    This Polariscope COE Test Card is very easy to use and works very well. I have given it to the instructor of a glass fusing class I am taking at a community college. It has been used to observe the results of glass fusing issues or problems with different types of COE-type glass after a kiln firing. The students now have a better understanding of the importance of using the same COE-type glass. They now know how important it is to make sure to use the same COE-type glass to allow a perfect outcome from the kiln

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