High Pure Fused Silica Glass/Lithography Lens/Excimer Laser Optics

• Certification: CE, ISO, BV
• Application: Rubber, Plastic, Chemical, Construction, Metallurgy, Ceramic, Casting, Glass, Astronomy, Medicine, Biology, Communication, Milit
• Type: Corning Optical Substrate
• Substrate: Corning 7978 Hpfs
• Oh Content [Ppm]: Less Than 1
• Strain Point: 1068 Celsuis Degrees
• Model NO.: RAY-LH382#
• Annealing Point: 1180 Celsuis Degrees
• Softening Point (Estimated): 1627 Celsuis Degrees
• Grade: Corning 7978 IR Grade
• Transport Package: Wood Case
• Specification: D500mm*H65mm
• Trademark: Corning
• Origin: USA
• HS Code: 2811229000
• Production Capacity: 100000kg Per Year

Product Description

General Introduction: Corning 7978 are high purity, noncrystalline silica glasses that combine a very low thermal expansion coefficient with excellent optical qualities and exceptional transmittance. Characteristics include homogeneity, low birefringence and outstanding transmittance in the DUV, UV, visible, and infrared ranges.
Corning HPFS Fused Silica glasses are known throughout the industry for their consistent, repeatable performance. We offer many different grades of fused silica to support various product applications. Glass codes 7978 is high purity non-crystalline silica glasses with excellent optical qualities. Product characteristics include extraordinarily low refractive index variations leading to state-of-the-art homogeneity values, low birefringence values, large size capabilities, exceptional transmittance from the deep ultraviolet through the infrared region, and an ultra-low thermal expansion coefficient; all of which are critical to our customers demanding needs

Products Name: Corning 7978 Fused Silica Glass
Alias: Corning 7978, HPFS Corning 7978, Corning 7978 fused silica, Corning 7978 fused silica glass, HPFS Corning 7978 Fused Silica, 7978 Corning glass, 7978 Corning Fused Silica, etc

Optical and Thermal Properties:

Glass Code:	7978	Viscosity
Softening Point*	1627 ˚C	107.6 poises
Annealing Point*	1180 ˚C	1013 poises
Strain Point*	1068 ˚C	1014.5 poises
Specific Heat 0.770 J/(g K)
Thermal Conductivity 1.38 W/(m K)
Thermal Diffusivity 0.0075 cm2/s
Thermal Expansion** (ppm/C):
5 ˚C to 35 ˚C		0.52 x 10-6
0 ˚C to 200 ˚C		0.57 x 10-6
-100 ˚C to +200 ˚C		0.48 x 10-6
ASTM Procedures - *C-598, **E-228

Mechanical Properties:

Unless otherwise stated, all values @ 25 °C
Elastic (Young's) Modulus	73 GPa
Shear Modulus	31 GPa
Modulus of Rupture, abraded	52.4 MPa
Bulk Modulus	35.9 GPa
Poisson's Ratio	0.16
Density	2.20 g/cm3
Knoop Hardness (100g load)	522 kg/mm2
Tensile Strength	54 MPa
Compressive Strength	1.14 GPa

HPFS Data and Properties:

Grade	7978 IR Grade
Inclusion Class	0, 1, 2
Homogeneity Grade	AA, A, C, F
Birefringence Lower specifications available upon request[nm/cm]	≤ 5
Striae ISO 10110-4 Class	5
Metallic Impurities [ppb]	< 100
OH Content [ppm]	< 1

Main Applying Fields:

Applying Fields:	Application of microlithography Lithography lens, Photomask substrate Deep ultraviolet laser element Optical standard parts Excimer laser optics Lithographic optics Beam transmission element Light guide Laser fusion Application of various aerospace technologies
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Matching Custom Manufacturing Serivce:
Including Moulding, CNC machining, Polishing, Particle beam processing, Magnetic flux conversion processing, Grinding, Coating, Lightweighting, Custom Shaping, Counterbores, Drilling & Coring, Edge & Bevel Polishing,3D Contouring, Bevels & Chamfers, Steps & Slots, Laser Cutting & Marking, Metrology & Inspection, Precision Pitch Polishing, Double-Sided Polishing, Optical Assembly, Measuring, etc.
Matching processing equipments;
1).Single side lapping and polishing machines
2).Duble sided polishing machines
3).Ring throwing machines
4).DMG five-axis five-linkage spherical milling machine
5).DMG ultrasonic machining center
6).Super large scale gantry cnc machining center (2.0*2.0m)
7).Super large scale surface grinder (1.6m*1.6m)
8).CNC cutting machines
9).Thin plate cleaning machines
10).Ultrasonic trough cleaning machines
11).Plane interferometers
12).Two dimensional detectors
13).Ion beam polishing machines
14).Magnetorheological polishing equipments

Main Cooperation Materials Manufacturers: 
CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC

Main Export Countries & Areas: 
Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.

Raytekoptics Extra value added services offered:
1). Optical workcraft & process solution design;
2). Rough processing raw materials;
3). Semi finishing raw materials;
4). Fabricate custom sizes and shapes;
5). Design and supply custom coatings;
6). Modify and resurface customer supplied materials;
7). Drill holes, notch glass and provide beveled substrates;
8). Precision polish optics with non-standard aspect ratios;

Payment Method: by T/T or Western Union.
Delivery time: 7-10 days.
Quality Warranty: Ruitaiphotoelectric(Raytekoptics) offers quality warranty for our optics products with "3R" policy--return, replace & refund policy.
For any inferior-quality products, Ruitaiphotoelectric(Raytekoptics) is responsible for return, replacement and refund.