UVT610V Series Processing Guidelines 20130624

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UVT610V Series Processing Guidelines 
 
 
 
Release Date: 24 June 2013 
Page 1 of 3 
 
PROCESS STEP CONDITION/PARAMETER 
Room Environment Class 10,000 or better 
Temperature: 25 ± 5°C Relative Humidity 45 – 65% 
All wetted surfaces must be stainless steel or solvent resistant plastic. 
Lens Cleaning Method Ensure parts are clean and free of dirt/contamination and static charge. 
If needed IPA wipe with Clean Room Wipes (>Class 10) can be used. 
Coating Application Class 1000 or better. 
Spray (conventional or HVLP) or flowcoat are the recommended application methods 
A reclaim, dry filter, or water wash booth can be used for spray applications. 
It is important to use a coating robot for spraying, repeatability and safety. 
A drip pan, knife blade, or curtain weir may be used for flowcoat applications. 
Control of the coating properties for flowcoating should be accomplished by adjusting one of the 
following: 
 Solids of the coating 
 Both specific gravity and temperature of the coating 
 Viscosity and temperature of the coating 
A chart showing specific gravity versus temperature data at various solids levels is shown on the final 
page of this document. 
Film Thickness Total film thickness recommendation is 6-16µm for all Class A surfaces. This is “pure coating” + “IPL” 
Minimum of 6µm of “pure coating” is recommended for optimum performance. 
Some test specifications will require a measurable IPL in order to comply with all tests. IPL is 
influenced by a number of factors including: heated flash temperature, heated flash time, substrate, 
substrate stress level, and other factors. Increasing the heated flash time or temperature will increase the 
amount of IPL measured. 
Performance testing has been completed with UVT610V series coating up to 22µm but does not show 
any additional performance benefit. 
A refractive index of 1.511 should be used for both the “pure coating” and “IPL” layers. 
A recommended film thickness gauge is FTM Lite NIR from www.applied-spectroscopy.com 
Application Room Any lights or windows must be covered by amber UV shielding from UVPS part numbers F007-006, 
F007-008, or F007-010 for windows and F007-003 for lights. Light must be filtered to 500nm. 
All fluid tubes must be stainless steel or black opaque solvent resistant plastic. 
Ambient Flash Less than or equal to 2 minutes at room temperature in an enclosed, ventilated tunnel. 
Heated Flash IR: 2.0 – 3.0 minutes, convection 5.0 – 8.0 minutes, or 2.0 – 3.0 minutes combo IR + convection with a 
peak lens surface temperature of 65 - 82°C. The actual temperature range needed may vary from this 
range to properly control IPL. 
The ideal profile is a gradual increase in temperature from ambient to the target temperature. It is not 
advised to hold the part temperature at a temperature for any duration. 
Optimum performance is obtained by exposing all coated surfaces to the proper heated flash temperature 
and time. 
The IR elements must emit only long wavelength. 
 
http://www.applied-spectroscopy.com/
 
 
UVT610V Series Processing Guidelines 
 
 
 
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Heated Flash 
Measurement 
Use a temperature profiling device such as a DataPaq Oven Tracker XL2 or Easy Track2 to ensure 
proper temperature control. www.datapaq.com 
Recommended thermocouples include: exposed junction thermocouples, PA0063, PA0065, PA0064, 
PA0071, PA0180, PA0182, PA0181. 
Probes should be attached to the surface of the lens either by melting the probe onto the surface or 
attaching with a high temperature polyamide tape such as DataPaq CS1030 or Dupont ™ Kapton. Probe 
should be located on all extreme areas of the lenses to ensure proper temperature distribution over the 
entire coated surface. One surface probe should be on the highest and lowest points on the lenses. 
Cool Down Less than 2 minutes at room temperature in an enclosed, ventilated tunnel. Chilled air should not be used 
in the cooling tunnel between the heated flash and UV cure zones. 
Do not expose the coating to stray UV light until ready to cure. 
UV Ovens Full cure is achieved in less than one minute at 3200-5500 mJ/cm² UVA by the EIT PowerMAP. The 
minimum intensity level for optimum performance is 250 mW/cm² UVA PowerMAP. www.eit.com 
The UV lamps must have a standard mercury bulb or the equivalent. Additive or doped bulbs are not 
recommended and are used at the end user’s own risk. 
Proper cure must be achieved on all coated surfaces of the lens in order to meet optimum performance. 
UV Cure Measurement Radiometers should ideally be placed in the part position in both high and low positions for UV energy 
and intensity measurements. 
All coated surfaces requiring performance require sufficient UV energy and intensity. 
PowerMAP settings include: 
 Cursors ON – cursors should be moved in as close as possible to the beginning and end of the 
UV curing profile 
 All 4 bands of UV Energy and Intensity should be measured and recorded 
 The sample rate should be 128 Hz 
 The time and date should be correctly set on the internal PowerMAP clock 
When profiling a process, the radiometer should not pass through the heated flash zone unless it cannot 
be avoided 
Radiometer 
Correlations 
Different models of radiometers read different values for the same amount of UV exposure. Some 
common radiometers and their respective UV energy (mJ/cm²) are listed below. Data was collected 
using a standard mercury bulb using both arc and microwave lamps. It is important to note that the UV 
energies listed below are guidelines. 
Puck 2 
UVA 
PowerMAP 
UVA 
 
UVR-N1 
3672 3284 1839 
4986 4453 2494 
5644 5622 3148 
The radiometers listed are: EIT Power Puck 2, EIT PowerMAP, GS YUASA UVR-N1. 
All measurements in the table above are in mJ/cm². 
 
 
http://www.datapaq.com/
http://www.eit.com/
 
 
UVT610V Series Processing Guidelines 
 
 
 
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