Orifice Rings for Glass Hot End

The Orifice Ring we produced also including the quality Zircon-Mullite (10-13% ZrO2 ;18-20% ZrO2 ).
As a daily work, we handle the testing of samples as following method:
Three vertical positions (top, middle and low) and five horizontal positions(right, mid-right, middle, mid-left and left), For each area, we can introduce a cloured tracer representing a glass defect as a 'heterogeneity in the glass structure'. High-resolution cameras record the behavior of the tracer. Results more than 150 trails were made covering all the above cases. to evaluate the performance of the patented rotor-tube we established a ranking from one to five as:
1. Sharp cord in the Orifice Ring.
2. Nearly sharp cord in the Orifice Ring.
3. Part of the tracer is mixed, part is nearly invisible cord in the Orifice Ring.