Guidance in selecting Transmission Haze Standards for Performance Qualification


FAQ: “Our Control Test piece usually measures around 23 – 34 % Haze.

Our Sample Test pieces usually measure between 1.00 – 10.00 % Haze.

The Quotation sates, “Typically a customer would select one at a haze level similar to or just above of haze their product”. So would you recommend I order a 5, 10 and 30% Haze Standard?”

The Haze Standards come as a CMR-2760 set at nominal values of 1%, 5%, 10%, 20%, 30% Haze. You can purchase a complete CMR-2760 set, or individuals at any level (specify when ordering) as CMR-2952.

The intended use of these Haze standards is for PQ Performance Qualification of operator and instrument. They should read consistently over time if operator and instrument are working correctly.

Let's use your samples as a test case for guidance in selecting an appropriate haze standard.

When you standardize your instrument, Air (or cell filled with distilled water) is used to set top-of-scale representing a perfect clear material of 0% Haze.

As PQ step 1, after standardization, read back Air or cell + DI water as a standard or sample to verify that it does indeed read 0% Haze. This will verify the operator and instrument are set up correctly for haze measurement.

As most of your production test samples measure between 1% – 10% haze, purchase and reading a CMR-2952 Haze 10 standard would be a good PQ2 step after reading your top-of-scale.

As your control sample at 23 – 34% Haze is far out of range of off your typical production, I would make the assumption that if the instrument is reading Air or cell + DI water at 0%, and a nominal CMR-2952 Haze 10 standard correctly near 10%, it is also reading at  correctly in the 23 – 34% Haze range.

If you feel this approach is insufficient, the other alternative would be to buy a Haze 30 standard in addition to read as PQ3 step.

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