1、Designation:D285115Standard Specification forLiquid Optical Adhesive1This standard is issued under the fixed designation D2851;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicate
2、s the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers liquid optical adhesive for usein bonding glass to glass or other transparent adherends.1.2 The values stated in SI units are to be regarded as
3、standard.The values given in parentheses are provided forinformation purposes only.1.3 The following precautionary caveat pertains only to thetest method portion,Section 6,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is t
4、he responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.Specific precautionary statements are givenin 6.1.1.2.Referenced Documents2.1 ASTM Standards:2D542 Test Method for Index of Refrac
5、tion of TransparentOrganic PlasticsD897 Test Method for Tensile Properties of Adhesive BondsD904 Practice for Exposure of Adhesive Specimens toArtificial LightD907 Terminology of AdhesivesD1084 Test Methods for Viscosity of AdhesivesE308 Practice for Computing the Colors of Objects by Usingthe CIE S
6、ystemE1953 Practice for Description of Thermal Analysis andRheology Apparatus3.Terminology3.1 DefinitionsMany terms in this specification are de-fined in Terminology D907.4.Significance and Use4.1 The bond strength tests provide reasonably accurateinformation with regard to the bond strength of the
7、adhesives.Bond strength data may be suitable for specificationacceptance,service evaluation,manufacturing control,research,and development.Bond strength tests are not consid-ered significant for applications differing widely from the testin rate and type of loading.5.General Requirements5.1 The adhe
8、sive shall be in liquid form and free of solventin order to avoid bubble formation in the adhesive layer.Eachcomponent shall be completely reactive(without residualvolatile products).The adhesive may be heat-,catalyst-,orradiation-cured.5.1.1 VolatilityVolatile content of the adhesive shall notexcee
9、d 0.5%,unless otherwise agreed upon between themanufacturer and the purchaser.5.1.2 ViscosityThe viscosity of the adhesive shall bewithin a well-defined range as agreed upon between themanufacturer and the purchaser.5.1.3 ColorThe color of the adhesive shall not exceed thecolor of a platinum-cobalt
10、standard solution No.300.5.1.4 CleanlinessThe number and size of foreign particlesfound in 100 mL of the adhesive shall not exceed 5 particles inthe size range from 10 to 100 m(0.1 mm),and none largerthan 100 m.The number and size of foreign particles in thecatalyst required to cure 100 mL of the ad
11、hesive shall notexceed 2 particles in the size range from 10 to 100 m,andnone larger than 100 m.5.1.5 Refractive IndexThe refractive index of the curedadhesive shall be within a well-defined range as agreed uponbetween the manufacturer and the purchaser.5.1.6 StabilityThe liquid adhesive shall not c
12、hange inviscosity by greater than 20%of its original viscosity norshow any formation of solids,when tested as described in 6.6.5.1.7 Light TransmissionVisible light transmissionthrough a bonded glass doublet(two glass disks bonded asdescribed in 6.8)shall not be less than 98.5%of the total lighttran
13、smitted through a single glass disk.There shall be nochange in light transmission of a glass doublet after theenvironmental test(see 6.9).5.1.8 Environmental TestSeparation within the adhesivelayer or from either glass surface of the glass doublet shall not1This specification is under the jurisdicti
14、on of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.60 on AdhesiveMaterial Classification System.Current edition approved Sept.1,2015.Published September 2015.Originallyapproved in 1970.Last previous edition approved in 2015 as D2851 98(2015).DOI:10.1520/D2851-1
15、5.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,W
16、est Conshohocken,PA 19428-2959.United States1 exceed 1.0 mm in depth nor extend beyond 180 of theperiphery of the adhesive layer(see 6.9).5.1.9 Bond StrengthThe tensile strength of a bonded glassdoublet after being subjected to the environmental test(see 6.9)shall be greater than 200 psi(1.38 MPa)or any value agreedupon between the manufacturer and the purchaser.6.Test Methods6.1 Volatility:6.1.1 Thoroughly clean three petri dish bottoms,95-mmoutside diameter,by washing with detergent and a scru