Norland UV Sealant UVS 91

SKU #UVS-91
Screenable paste for bonding and sealing perimeters of liquid Paste crystal displays.
  • $60 material handling charge applied to Norland adhesives ordered in Australia.
  • Please note the Minimum Order Quantity (MOQ) requirements, particularly for small volume Norland items.
As low as AU$26.15 AU$28.77
Typically Ships in 10 to 15 Business Days
Part Number
UVS-91

Introduction

Norland UV Sealant 91 ("UVS 91") is a screenable paste adhesive specifically designed to seal the perimeter of liquid crystal displays. It provides the ultimate solution for manufacturing displays because it is a single    component, solventless, sealant that cures quickly at room temperature by exposure to UV light.  UVS 91 is cured by ultraviolet light with maximum absorption within the range of 320-380 nanometers and peak sensitivity around 365nm.  The recommended energy required for full cure is 4.5 Joules/cm2 in these wavelengths. The cure is not inhibited by oxygen, hence any areas in contact with air will cure to a non-tacky state when exposed to ultraviolet light.

Norland UVS 91 has the following advantages:
  • No mixing or drying operations
  • Non reactive with liquid crystal chemistry
  • No long heat cures
  • No viscosity increase during use
  • Excellent adhesion
  • Excellent flow out characteristics
  • Excellent screenability
  • Outstanding aging characteristics
  • Low moisture permeability.

The overall benefit to the user is simplification of the operation which saves time while still providing a high quality product.

 

Physical Properties of UVS 91

Elongation at Failure 58%
Modulus of Elasticity (psi) 45,000
Tensile Strength (psi) 2,900
Hardness - Shore D 55
Water Absorption (24 hrs @ 50° C) 0.14%
Shear Strength - Glass to Glass (psi) 850

 

 

UVS 91 Adhesive Tests

 

 

 

 

 

 

 

Figure 1 shows the viscosity vs shear rate as measured on a plate and cone viscometer. UVS 91 is formulated to allow easy screening in thin layers. The viscosity is designed to flow under shear and to be relatively high on standing.

 

  

One of the major advantages of UVS 91 is its non-reactivity with liquid crystal chemistry. Figure 2 below shows the typical compatibility of this material with liquid crystals. UVS 91 shows no contamination when used to make cells with an undoped ester liquid crystal even under accelerated heat aging at 100° C.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Handling Procedure

The adhesive should be screened onto clean glass or metaloxide surfaces. No primers are required. A 350 to 400 mesh polyester screen is recommended to provide the very thin coatings necessary for LCD's. Adjust the screen tension and application pressure to get the coating thickness desired.

When the top plate is laminated to the bottom, even pressure must be applied to bring the spacing in all areas down to the required distance. Controlled size spacers are often added to the adhesive or sprayed onto the surface to provide the exact distance for each application.

The display is then placed on a conveyor which travels under a high intensity UV light source. Curing occurs in 5 to 10 seconds using a 1000 watt or 1500 watt medium pressure mercury lamp @ 4 to 6 inches. Conveyor  speed would be approximately 12 ft/min to accomplish this. For small production or test work, curing can be accomplished in 5 minutes with a 100 watt mercury spot lamp at a distance of 12 inches. Longer exposure to UV light will in no way harm the adhesive.

Clean up of equipment can be accomplished with acetone or trichloroethylene. Care should be taken in handling this sealant. Prolonged skin contact should be avoided and affected areas should be washed well with soap and water. Avoid prolonged vapor inhalation and use in a well ventilated area.

More Information
Manufacturer Norland
Product Series Norland UV Curing Optical Adhesives
Industry Aerospace and Defence, Medical, Optical Equipment Manufacturing (OEM), Photonics, Research
Applications OEM (Optical Equipment Manufacturing), Assembling and disassembling multi-element systems
Standard Package Contains
Warranty Notes AusOptic Genuine Product Guarantee
Authorised distributor, benefit from manufacturer-backed, local warranty coverage, genuine parts, and our experienced local support team
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