1997: VPC Crystal Window (Aluminium housings)
The IRISS Original IR windows were produced using Aluminium constructed housings and used Calcium Fluoride, Barium Fluoride and Sapphire crystals as the infrared window lens materials. These were both round and square depending on the application.

2000: VPC Crystal Window (Plastic housing)
Aluminium IR window covers and bodies were superseded by plastic to enhance the safety of the product by ensuring that the assemblies were non conductive. This also allowed the product to be mass produced and allowed the unit costs to be reduced. Products still used Calcium Fluoride, Barium Fluoride and Sapphire crystals as the infrared window lens materials.

2003: VPF IR Polymer Window
Plastic IR window covers and bodies were a great success and improvements were made in design which became the standard design material for IRISS IR Windows. We were however concerned about the problems regarding Fluoride crystals as users of infrared windows were unhappy with inconsistencies in IR transmission and failure through breakage and water ingress.
IRISS conducted an extensive search for replacement materials that could be used to replace Fluoride crystals, eventually we found IR transmitive polymers with the required infrared transmission and the ability to resist impact and also resistant to water and light acids & alkalis. Hence the launch of the VPF range of IR windows it was at this stage that the IRISS range of IR windows were UL Certified to UL508 & 508A, and tested to IP65/NEMA4 open or closed.

2005: VPFR IR Polymer Window (IR1 Plastic Reinforced Grill)
Further investigations into relevant standard showed IRISS that there was a lack of understanding in what standards were applicable to infrared windows, especially surprising was the fact that UL only certified to 1500Volts! We decided to build a window that could pass the requirements for a standard viewing pane fitted to electrical switchgear as stipulated by IEEE C.37.20.2.

This test was completed by supporting the IR polymer with one plastic IP2X grill in front of the polymer, this also ensured that in the event of a lens failure the window would always fail safe!! The VPFR IR window became the first and only infrared window in the world to give an IP65/NEMA 4 IR lens assembly to meet this standard.

2005: VPFR IR Polymer Window (IR1 Plastic Coated Aluminium Grill)
As a further enhancement to the successful VPFR range of infrared windows IRISS superseded the plastic reinforced grill with a plastic coated Aluminium grill and subjected the assembly to the test standard UL746 C, this tested the lens flammability and impact resistance of the lens at 0°C, the lens system easily passed this test and is the only infrared window lens system that holds this certification in the World.

2006: VPFR IR Polymer Window (IR2 Plastic Coated Aluminium Grill)
IRISS decided to further improve our VPFR range of IR windows by using 2 IP2X Aluminium grills, effectively sandwiching the polymer lens to produce a lens assembly that is able to resist constant impact from a 5lb hammer, passed the UL 5 inch flame test, has excellent IR transmission, is resistant to water, light acids and alkalis and is guaranteed for the life of the installation. In short the IRISS VPFR range of infrared windows is the "ULTIMATE IR WINDOW SOLUTION" on the market today.

2007: Watch this space!!!!

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