REFLECTIVE PAINT

EJ-510

EJ-510 reflective paint for plastic scintillators is a bright white paint consisting of titanium dioxide pigment and a water soluble paint base selected for excellent resistance to yellowing and good adhesion. While primarily intended for coating of blue-emitting plastic scintillators, EJ-510 employs a blend of pigments selected also for enhanced reflectivity for longer wavelength scintillators with green emissions. This is a diffuse reflector for use on scintillators where the length is not greater than twice the width. It should not be used on long, narrow, optical elements. In addition to plastic scintillators, EJ-510 has been successfully applied to acrylic light guides and a variety of metals.

Maximum reflectivity is achieved by the application of three or four thin coats of EJ-510. After it has thoroughly dried, EJ-510 is not water soluble. However, it may be removed from a painted article by gentle rubbing with the aid of a mixture of water and isopropanol. One liter of EJ-510 can easily cover 10 square meters with three layers of the coating.

Note: EJ-510 should not be used on hygroscopic materials such as some inorganic scintillators.

Instructions for Use: Always shake well before each use. Apply to clean, dry, sanded (240 - 400 grit) or sand-blasted surfaces for best adhesion. Paint may be diluted with water as needed for application. Allow paint to dry thoroughly between coats. For best reflectivity, apply a minimum of three coats.

SILICONE RUBBER OPTICAL INTERFACE

EJ-560

EJ-560 silicone rubber has been developed specifically for making optical joints between photosensors and plastic scintillators. The rubber material is quite soft and flexible and can be made to conform to contoured surfaces. It is a fully-cured polymer designed so its surfaces are slightly sticky to the touch, and it can be deformed under mild pressure. Nevertheless, it does not flow like a grease and will not extrude irreversibly out of its compression region, making it ideal for long-term coupling of photomultiplier tubes to scintillators.

EJ-560 is available in either pre-cut discs or sheet form. The sheet material can easily be cut to size with razor blades or scissors. All EJ-560 products are shipped with the surfaces masked with an easily removed thin film.

EJ-560 rubber will easily adhere to any smooth surface and can also easily be peeled away without damaging either component. If the EJ-560 surfaces become covered with dust, their adhesive properties will be diminished. However, they can be cleaned with the aid of any lower alcohol, such as isopropyl alcohol, and restored to their original condition.

SILICONE GREASE

EJ-550, EJ-552

These two materials are offered for use in optically coupling photosensors to scintillators and light guides. They are packaged in convenient squeeze tubes. Both have low bleed and evaporation rates at 25°C and are safe for handling and storage when exercising standard cleanliness procedures.

EJ-550 Optical Grade Silicone Grease is a clear and colorless optical coupling compound having moderate viscosity and providing excellent transmission properties well into the near-ultraviolet region. It should be stored at temperatures below 26°C, preferably below 5°C. EJ-550 retains clarity and fluid property down to -60°C.

EJ-552 General Purpose Silicone Grease is a translucent grease having high viscosity. It is recommended for use where the very best optical coupling is not required. It is best pressed out to a thickness below 0.1 mm where it becomes nearly transparent. It is best stored at room temperature.