ASTM D2851-98(2009)
(Specification)Standard Specification for Liquid Optical Adhesive
Standard Specification for Liquid Optical Adhesive
ABSTRACT
This specification covers liquid optical adhesive for use in bonding glass to glass or other transparent adherends. The adhesive shall be in liquid form and free of solvent in order to avoid bubble formation in the adhesive layer. Each component shall be completely reactive. The adhesive may be heat-, catalyst-, or radiation-cured. Voltatility, color, viscosity, foreign particle content, refractive index, stability, light transmission, glass doublet preparation, environmental test, and bond strength tests shall be performed in accordance with the specified requirements.
SCOPE
1.1 This specification covers liquid optical adhesive for use in bonding glass to glass or other transparent adherends.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information purposes only.
1.3 The following precautionary caveat pertains only to the test method portion, Section 6, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 6.1.1.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D2851 −98(Reapproved2009)
Standard Specification for
Liquid Optical Adhesive
This standard is issued under the fixed designation D2851; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Bond strength data may be suitable for specification
acceptance, service evaluation, manufacturing control,
1.1 This specification covers liquid optical adhesive for use
research, and development. Bond strength tests are not consid-
in bonding glass to glass or other transparent adherends.
ered significant for applications differing widely from the test
1.2 The values stated in SI units are to be regarded as
in rate and type of loading.
standard. The values given in parentheses are provided for
information purposes only.
5. General Requirements
1.3 The following precautionary caveat pertains only to the
5.1 The adhesive shall be in liquid form and free of solvent
test method portion, Section 6, of this specification: This
in order to avoid bubble formation in the adhesive layer. Each
standard does not purport to address all of the safety concerns,
component shall be completely reactive (without residual
if any, associated with its use. It is the responsibility of the user
volatile products). The adhesive may be heat-, catalyst-, or
of this standard to establish appropriate safety and health
radiation-cured.
practices and determine the applicability of regulatory limita-
5.1.1 Volatility—Volatile content of the adhesive shall not
tions prior to use. Specific precautionary statements are given
exceed 0.5%, unless otherwise agreed upon between the
in 6.1.1.
manufacturer and the purchaser.
2. Referenced Documents
5.1.2 Viscosity—The viscosity of the adhesive shall be
within a well-defined range as agreed upon between the
2.1 ASTM Standards:
manufacturer and the purchaser.
D542Test Method for Index of Refraction of Transparent
5.1.3 Color—The color of the adhesive shall not exceed the
Organic Plastics
color of a platinum-cobalt standard solution No. 300.
D897Test Method forTensile Properties ofAdhesive Bonds
5.1.4 Cleanliness—Thenumberandsizeofforeignparticles
D904Practice for Exposure of Adhesive Specimens to
foundin100mLoftheadhesiveshallnotexceed5particlesin
Artificial Light
the size range from 10 to 100 µm (0.1 mm), and none larger
D907Terminology of Adhesives
than 100 µm. The number and size of foreign particles in the
D1084Test Methods for Viscosity of Adhesives
catalyst required to cure 100 mL of the adhesive shall not
E308PracticeforComputingtheColorsofObjectsbyUsing
exceed 2 particles in the size range from 10 to 100 µm, and
the CIE System
none larger than 100 µm.
3. Terminology
5.1.5 Refractive Index—The refractive index of the cured
3.1 Definitions—Many terms in this specification are de- adhesive shall be within a well-defined range as agreed upon
fined in Terminology D907. between the manufacturer and the purchaser.
5.1.6 Stability—The liquid adhesive shall not change in
4. Significance and Use
viscosity by greater than 20% of its original viscosity nor
4.1 The bond strength tests provide reasonably accurate
show any formation of solids, when tested as described in 6.6.
information with regard to the bond strength of the adhesives.
5.1.7 Light Transmission—Visible light transmission
through a bonded glass doublet (two glass disks bonded as
This specification is under the jurisdiction of ASTM Committee D14 on described in 6.8) shall not be less than 98.5% of the total light
Adhesives and is the direct responsibility of Subcommittee D14.60 on Adhesive
transmitted through a single glass disk. There shall be no
Material Classification System.
change in light transmission of a glass doublet after the
Current edition approved Nov. 1, 2009. Published November 2009. Originally
environmental test (see 6.9).
approved in 1970. Last previous edition approved in 2004 as D2851–98(2004).
DOI: 10.1520/D2851-98R09.
5.1.8 Environmental Test—Separation within the adhesive
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
layer or from either glass surface of the glass doublet shall not
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
exceed 1.0 mm in depth nor extend beyond 180° of the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. periphery of the adhesive layer (see 6.9).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D2851−98(2009)
5.1.9 Bond Strength—Thetensilestrengthofabondedglass
Pt-Co Stock Solution Distilled H O
doubletafterbeingsubjectedtotheenvironmentaltest(see6.9)
Number of Pt-Co 500, mL to Be Added, mL
shall be greater than 200 psi (1.38 MPa) or any value agreed
500 100 0
upon between the manufacturer and the purchaser.
450 90 10
400 80 20
350 70 30
6. Test Methods
300 60 40
6.1 Volatility: 250 50 50
200 40 60
6.1.1 Thoroughly clean three petri dish bottoms, 95-mm
150 30 70
outsidediameter,bywashingwithdetergentandascrubbrush.
100 20 80
Rinse with warm running tap water. Place petri dishes in an 75 15 85
50 10 90
air-circulatingovenfor30minat65 62°C(150 64°F).Raise
0 0 100
temperature to 110 6 2°C (230 6 4°F) for 1 h. Remove petri
dishes from oven and place in a desiccator. After petri dishes
Store the stock solutions in clean glass bottles and stopper
have cooled to room temperature, approximately 2 h, weigh
them to prevent evaporation loss.
each dish to the nearest 0.1 mg. (Warning—In addition to
6.4 Foreign Particle Content—Inspect a 100-mL sample of
other precautions, do not handle petri dishes with bare hands.
Use tongs.) the liquid adhesive and a sample of its catalyst for cleanliness
byfilteringeachthroughalow-formGoochcruciblefittedwith
6.1.2 Replaceeachpetridishintheovenat110 62°C(230
6 4°F) for 1 h. Repeat cool-down procedure. Reweigh each a filter membrane of 5.0 to 10.0-µm pore size and a color
suitabletoeasilydetectandexamineforeignparticles.Measure
petridishtothenearest0.1mg.Ifweightagreestowithin 60.2
the size of the particles by means of a calibrated traversing
mg of initial weight, proceed to 6.1.3. If weight exceeds this
microscope(10×)orotherequivalentmeans.Iftheviscosityof
60.2-mgrange,repeatprocessuntilaconstantweightforeach
the sample is too high, dilute it with any clean and suitable
petri dish is obtained.
solvent to permit easy flow of the liquid through the filter
6.1.3 Toeachpetridishaddapproximately10gofadhesive,
membrane.
and mix with catalyst or any component part required for
cur
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