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unfilled potting compounds (transparent polyurethane, UV stable, non yellowing for LED devices)
 

have been developed for application in solarcell and lighting components. These formulations exhibit following characteristics:

Clear casting

Clear led casting resin

epoxy resin

Plastic resin LED

UV stable transparent PUR polyurethane

Transparent casting resin

Transparent PUR

Transparent PUR

Transparent PUR

 

Contact
applications
castingguide PUR
Transparent polyurethane products
properties of transparent polyurethanes PUR
different possibilities with transparent polyurethanes (recipy choice)
UV stability of transparent polyurethanes (PUR)

- Fully transparent

- 100% UV stable, not effected by UV lighting

- Flexible as rubber or hard concrete

- Flame retardant (UL V0)

- Colours on request

-Better wearing then Epoxies

-Cheaper then Silicones

-Alternative for Acrylates

- Non yellowing

-High optical transmittance in the UV-visibel region

-Can be synthesized to cover a wide range of fefracctive indeces from 1.38-1.58

-Excellent photo-thermal stability (100%)

-A variet of cure chemistries for easy processing

-High purity

-A wiode range of cured modlul from gelst to hard resins

-Packaging material for LED

-Clear transparynce

-Protective encapsulants and lenses for HB (high brightness) LEDs

-Cushion from internal and external stress

-Underwater LED devices

-No shrinkage

-Minimum shrinkage

-high optical flux

-various viscosities (viscosity)

More information about our you can find at www.clearpur.com

In general, polyurethanes are produced by means of a reaction between polyols and isocyanates. Some polyols and isocyanates absorb light. In particular, aromatic isocyanates absorb in the UV region.As a result, aromatic polyurethanes that are produced from these isocyanates, will absorb light, and therefor, will not be colourless. Even more, by absorption of UV radiation, they will gradually change their colour over time - a process called yellowing. This may take place in several weeks. Aromatic polyurethanes are found in traditional, filled potting systems. Since traditionally potted devices are hidden away inside equipment, the theoretical problem of discolouration on exposure to UV- or sunlight is academic, but irrelevant to the electronic devices manufacturers.

index.php?title=potting compound for LED applications

In translucent applications, such as LED packaging and encapsulation, the casting resin is permanently exposed to UV- or sunlight. In many cases, the casting resin is not just a means of protection – it becomes a part of the design and looks of the device. The efficiency of the LED will also depend on the translucency of the casting resin. Therefor, in these applications, the polyurethanes must be absolutely colourless and fully transparent, in other words, they should not absorb in the UV-VIS region. With these prerequisites, polyurethanes can be obtained that are stable even after exposure to UV – or sunlight for a long time. For outdoor applications it is furthermore relevant that the UV stability also leads to a longer lifetime as regards mechanical failure. Since UV radiation is not absorbed, there is no radiation damage to the polymeric network. Absorption of UV energy leads to an electronically excited state that results in the formation of some radicals. Eventual radical attack of the polymeric network will cause deterioration of the mechanical properties of the product, hereby dramatically shortening its outdoor lifetime.

UV-stability.php?title=LED polyurethane PUR

Intercol's transparent polyurethanes are made up of polyols and isocyanates that do NOT absorb in the UV-VIS region. Our fully transparent polyurethanes, are therefor colourless, fully transparent and UV stable. In other words, discolouration or 'yellowing' is not observed in our transparent polyurethanes, even if they are exposed to artificial- or sunlight for long periods of time. In addition, the mechanical properties of the product are maintained throughout the exposure.

properties.php?Non yellowing Transparent potting compound

This makes Intercol's transparent polyurethanes ideally suited for outdoor, heavy duty, translucent applications.

www.loonmengen.nl/transparent-polyurethanes

www.industrielijmen.info/transparent-polyurethanes

www.gietharsen.nl/transparent-polyurethanes

www.lijmpatronen.nl/transparent-polyurethanes

www.clearpur.com/transparent-polyurethanes

28 verschillende trefzinnen Zoek Procent
clear resin 3 9.6 %
cratches 2 6.4 %
dichtheid d30 1 3.2 %
loan 1 3.2 %
polyurethaan dichtheid viscositeit 1 3.2 %
uv stable epoxy 1 3.2 %
clearpur.com 1 3.2 %
brandklasse v0 1 3.2 %
transparent polyurethane 1 3.2 %
tamiflu 1 3.2 %
pu resin pur 260 1 3.2 %
clearpur 1 3.2 %
doorslagspanning lijmen 1 3.2 %
site clearpur.com 1 3.2 %
système clearpur 1 3.2 %
wellbutrin 1 3.2 %
led transparent encapsulant refractive index 1 3.2 %
hotmelt futura 1 3.2 %
led transparent resin 1 3.2 %
duplex karton 1 3.2 %
wlmlqb 1 3.2 %
alifatische lijm 1 3.2 %
hm-futura-1 1 3.2 %
transparent resin casting guide 1 3.2 %
led casting resin 1 3.2 %
how to cast transparent polyurethanes 1 3.2 %
insulin 1 3.2 %
potting pur 260 1 3.2 %

 

     
     
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