勾践卧薪尝胆Norland Optical Adhesive 61
Norland Optical Adhesive 61 ("NOA 61") is a clear, colorless, liquid photopolymer that will cure when expod to ultraviolet light. Since it is a one part system and 100% solids, it offers many advantages in bonding where the adhesive can be expod to UV light. The u of NOA 61 eliminates premixing, dryi
易之而教之打孟子一句ng or heat curing operations common to other adhesive systems. Curing time is remarkably fast, and is dependent upon the thickness applied and the amount of ultraviolet light energy available.
NOA 61 meets Federal Specification MIL-A-3920 for optical adhesives and is approved for u on all government contracts specifying such adhesives. The adhesive is designed to give the best possible optical bond to glass surfaces, metals, fiberglass and glass filled plastics. NOA61 is recommended for bonding lens, prisms and mirrors for military, aerospace and commercial optics as well as for terminating and splicing optical fibers.
NOA 61 also has excellent clarity, low shrinkage and as light flexibility that make it superior to other materials for optical bonding. The characteristics are important in order for the ur to produce high quality optics and achieve long term performance under changing environments.
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NOA 61 is cured by ultraviolet light with maximum absorption within the range of 350-380 nanometers. The recommended energy required for full cure is 3 Joules/sq. cm in the wavelengths. The cure is not inhibited by oxygen, hence any areas in contact with air will cure to a non-tacky state when expod to ultraviolet light.
In most optical applications, curing is done in two steps. A short, uniform exposure, or precure, is u
d first. The precure time is of sufficient duration to t the bond and allow it to be moved without disturbing alignment. This is followed by a longer cure under UV light to obtain full cross linking and solvent resistance of the adhesive. The precure can be obtained in 10 conds using a 100 watt mercury lamp at 6".Where longer time is required for alignment, it can be extended to a few minutes using a very low intensity light source. The final cure can be accomplished in 5 to 10 minutes using the 100 watt mercury lamp.
The precure allows the ur to align and t the precision parts quickly and minimizes the number of holding fixtures required. After the precure, excess adhesive can be wiped up with an alcohol or acetone moistened cloth. Asmblies should be inspected at this time and rejects parated in methylene chloride. The bonded area must be soaked in the solvent and normally will parate
《给爸爸的一封信》overnight. The time required to break the bond depends upon the extent of the cure and the size of the bond area.
When fully cured, NOA 61 has very good adhesion and solvent resistance, but it has not reached its optimum adhesion to glass. This will come with aging over a period of about 1 week in which a
chemical bond will form between the glass and adhesive. This optimum adhesion can also be obtain
ed by aging at 50° C for 12 hours.
NOA 61 can withstand temperatures before aging from -15°C to 60° C when ud for glass bonding. After aging, it will withstand temperatures from -150° C to 125° C.
Shelf life of liquid is at least 4 months from the date of shipment if stored in a cool (5-22° C), dark place in the original container. If refrigerated, allow the adhesive to come to room temperature prior to u.
Care should be taken in handling this material. The Material Safety Data Sheet (MSDS) should be read for this product as well as for any associated products such as alcohol, acetone or methylene chloride. Prolonged contact with skin should be avoided and affected areas should be thoroughly washed with copious amounts of soap and water. If the adhesive gets into eyes, flush with water for 15 minutes as ek medical attention. U the material in a well ventilated area, otherwi a NIOSH approved organic vapor mask is recommended.
Spectral Transmission of NOA 61
Typical Properties of NOA 61 Solids 100%Viscosity at 25° C
300 cps Refractive Index of Cured
Polymer
1.56Elongation at Failure
38%Modulus of Elasticity (psi)
150,000Tensile Strength (psi)
3,000Hardness - Shore D 85
For more technical information on NOA 61 click here to go to page 2.
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Norland Optical Adhesive 61
The following are typical properties of NOA 61:
Liquid
Color (APHA)80
Viscosity at 25?C 300-450 cps
Refractive Index (liquid) 1.527 Density (gm/cc) 1.231 Surface Tension (dynes/cm)40.0 Flash Point175癈
Cured Film
Modulus (psi)135,000-160,000
Tensile (psi)2,800-3,500
Elongation at Failure35% Shore燚 Hardness85 Density 1.29 Water Vapor Permeability (gm/100
sq. in./24hrs/mil)
1.48 Water Absorption0.16% Linear Shrinkage 1.5% Dielectric Constant (1 MHz) 4.04 Dissipation Factor (1 MHz)0.045
Volume Resistivity (0hm-cm)1.0 x 10 to the 15
Surface Resistivity (Megohms)1.0 x 10 to the 9
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Dielectric Strength (volts/mil)980
Coefficient of Thermal Expansion as a Function of Temperature
VISCOSITY vs. TEMPERATURE
Wavelength (nm.)
侯的组词
孕妇上火怎么办Index 643.8
1.5562589.6
1.5594546.1
1.5634480.0
1.5691435.8 1.5754
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