Front Surface Mirror for Projection 3 & 5 mm

 

Significantly Improved Reflection

The trend in office automation is towards higher resolution for products such as laser printers, copiers and scanners, we offer high reflector mirrors using selected flat glass with excellent surface quality for the enhanced performance requirements of these products. These mirrors offer the durability and economy of aluminium-based thin film coatings.

 

Typical Nominal Reflection Scans

Environmental and Durability Requirements

Coating Adhesion: The mirror coating shall show no damage after 3M Scotch Brand No. 600 adhesive tape (or equivalent) is placed firmly against the coated surface and removed quickly.

Abrasion Resistance: The mirror coating shall show no damage after a 200-rub test with a cheesecloth pad approximately 9.5 mm (0.38 inch) diameter by 12.7 mm (0.50 inch) thick. The bearing force shall be one pound +/- 1/4 pound (454 g +/- 114g).

Humidity Resistance: The mirror coating shall show no deterioration after exposure to 24-hour humidity test of 49°C and 95% relative humidity.

Corrosion Resistance: The mirror coating shall show no deterioration after 24 hours of exposure to a salt fog test (5% NaCl by weight in water) at 35°C.

 

Glass Thickness and Flatness

The HR94 mirror is available in3 und 5 mm from Stock. 4, 6 und 10 mm can be offered upon request. Our standard is the float glass flatness. If you need any other thicknesses, flatnesses or wavelengths

please do not hesitate to contact us.

 

Spezifikationen

Kratzer

Width	Accumulated Length
> 0,08 mm	None allowed
0,02 – 0,08 mm	None more than 10% of diagonal of cut part
< 0,02 mm	Disregard

 

Circular Defects (Voids, Digs, Spatter)

Average diameter	Specification
> 0,5 mm	None allowed
0,05 – 0,5 mm	Accumulated circular defects shall not exceed the size of 2.0 mm in strange of 19 mm.
< 0,05 mm	Disregard

 

Spots

No stains are allowed that are readily visible to the unaided eye when viewed under the following viewing conditions.

 

Viewing Conditions

View at 30-60 cm with overhead lighting to observe the front surface at 1000 Lux of fluorescent illumination (daylight conditions). Observe pinholes with bottom lighting of 100 foot-candles of diffused fluorescent illumination. The ambient lighting is 30-50 foot-candles. The total observation time is 30 to 35 seconds. The viewing angle can range from 0-75 degrees.

For your individual requirements we offer two additional Products to HR94 (Standard, pls. look on top): HR97C and HR780A.

 

 

Front Surface Mirror for Projection 6 mm

 

Significantly Improved Reflection

The trend in office automation is towards higher resolution for products such as laser printers, copiers and scanners, we offer high reflector mirrors using selected flat glass with excellent surface quality for the enhanced performance requirements of these products. These mirrors offer the durability and economy of aluminium-based thin film coatings.

 

Typical Nominal Reflection Scans

 

Durability Requirements

Abrasion test: 200 strokes, 566 g, with cheesecloth

Adhesion test: with tape Scotch, 3M 8981

Humidity test: 48 h, 95% relative humidity, 50°C

Immersion test in salt solution: 37 g/l, 24 h at room temperature

Salt spray test: to ISO 9227 NSS, 48 h

Wipe test: 20 cycles with isopropyl alcohol, glass cleaner, acetone

Immersion test in isoprop. alc.: 2 h at room temperature

Cycling test: 4 h at 80°C, 4 h at -30°C, 16 h at humidity to ISO 6270 part 1, 4 cycles

High temperature storage: 7 days at 100°C

 

Defect Standards

type of defect	size of individual defects	max. number of defects allowed	min. distance between  mistakes
pinholes, glass defects	> 0.7 mm	not allowed
	> 0.3 bis < 0.7 mm	unlimited	50 mm
	< 0,3 mm	not evaluated, but not clouding
scratches	width up to 0.08 mm	total length, max. 1/3 of longest edge	50 mm
	width under 0.01 mm	not evaluated

 

Staining:

Stains in the coating visible in reflected light at an intensity of 1500 Lux are not allowed.

 

Visual Inspections

Before the visual inspection is performed, the complete glass will be wiped on the coated side with alcoholsoaked cloth.

The uncoated side is excluded from the inspection. Cosmetic defects out of specification are allowed at the uncoated side as long as they are not visible from coated side.

1. Visual inspection in reflection

• The visual inspection in reflection is performed on a test location with a light intensity of 1500 Lux.
• For inspection, the mirrors are positioned vertically in front of a black background. The incidence angle of the light source on the front surface mirror is approx. 30° to the vertical.
• The coated side of the front surface mirror is towards the observer.
• The visual inspection for surface defects (scratches, stains) and impurities is performed at a distance of approx. 70 cm from the front surface mirror‘s test position.

 

2. Visual Inspection in Transmission

• Following the visual inspection in reflection, the visual inspection in transmission is performed in a light box with a light intensity of 500 Lux.
• The glass panel is placed in the light box so that the front surface mirror is positioned vertically with the coated side towards the observer.
• The front surface mirror is inspected for coating defects (scratches, pinholes) and glass defects from a distance of approx. 50 cm from light box.

 

 

For all Mirrors applies the following

Optical drawlines:

This optical effect is inherently connected to the surface flatness of the glass and will ALWAYS be visible in nowadays high resolution projection system.

One can only reduce its visibility by setting parameters like number of mirrors, thickness of all mirrors involved, beam angle in the optical paths, polarization, size of the mirror, which is connected to the possibility to orient the drawlines to make them least visible. Only optically polished glasses don’t show this effect. However, they are not available for such applications.