At Schlegel Electronic Materials Inc. we have an unwavering commitment to the safety of our customers and our co-workers during the COVID-19 virus pandemic. SEM is a worldwide company and our facilities in Asia, Europe, and the United States are working in concert to provide production support as needed. We are currently operating at 100%

Workable Specification For Hard Coatings

Due to the application methods of hard coatings on plastic substrates, blemishes do occur. These blemishes take the form of coating inclusions, trapped fibres and exaggerated material defects. So that SEM can work with these products, it is important to lay down a specification and inspection criteria. This is a specification which we feel is obtainable and repeatable, when viewed against past performance of coating suppliers. With individual project discussions, it may be possible to tighten up the specification, but this will be done by inspecting out defects and will have obvious implications on price.

Inspection Conditions.

The panel should be viewed from the front face under daylight conditions, with normal non-directional lighting. Viewing should take 15 seconds and from a distance of 450 mm.

Blemishes.

SIZECRITERIA (Window Area)CRITERIA (Non Window Area)
<0.15 mmDisregardDisregard
0.15 - 0.3 mm5 per 100 x 100 mm5 per 100 x 100 mm
0.3 - 0.5 mm1 per panel2 per panel
0.5 - 0.750 per panel1 per panel
Small Fibre1 per panel3 per panel

Scratching.
Where polycarbonate panels are used, fine scratching will be inevitable on the rear surface. These marks can be caused by wiping with the softest of cloths, and even though they are extremely fine, they can look obvious when illuminated.

For panels larger than 100 mm square, only one scratch allowed on the front face if less than 10 mm long.

Summary.
Please be assured that we will attempt to produce the best quality panels that we can from hard coated material. This specification is an indication of worst case conditions, allowing for our suppliers current quality.