Customized Deep Processing Borosilicate Glass Sheet N-Bk7 Optical Glass Plate

• Customization: Available
• Certification: CE, ISO, BV
• Application: Rubber, Plastic, Chemical, Construction, Metallurgy, Ceramic, Casting, Glass, Astronomy, Medicine, Biology, Communication, Milit
• Model NO.: RAYTEK-OG-0007#
• Type: Optical Glass
• Substrate: N-Bk7 Optical Glass
• Cte: 7.1*10-6/K (-30 Celsuis Degree to +70celsuis Degr)
• Annealing Point: 719celsuis Degrees
• Transformation Temperature Tg: 557celsuis Degrees
• Abrasion AA: Ve = 63,96 Vd = 64,17
• Transport Package: Wood Case
• Specification: 300mm*200mm*170mm
• Trademark: Raytek
• Origin: Germany
• HS Code: 2811229000
• Production Capacity: 100000kg Per Year
• Package Size: 40.00cm * 40.00cm * 25.00cm
• Package Gross Weight: 8.000kg

Product Description

High-Quality N-BK7 Borosilicate Crown Glass for Laser Components & Optics

Product Description

As a premium grade of borosilicate crown glass, N-BK7 stands out for its exceptional optical homogeneity, making it a top choice for high-precision optical applications worldwide. Specifically engineered for scenarios where uncompromising quality in both light transmission and reflection is required, this high-quality N-BK7 glass is widely adopted in manufacturing critical laser component glass-meeting the strictest performance standards for laser systems, optical lenses, and precision mirrors.

Cost-Effective Excellence: Delivers excellent optical quality at a competitive price point, offering exceptional value for high-volume or precision-focused projects without compromising on performance.
Superior Processability: Easy to polish to a high-quality finish; the achievable polishing precision meets the demanding needs of high-power laser component glass applications, ensuring minimal light scattering and optimal beam transmission.
Broad Wavelength Compatibility: Ensures unobstructed transmission in the wavelength range of 400nm to 2000nm, making it ideal for visible light optics, near-infrared sensors, and mid-range laser systems.
Extended Utility for HR Mirrors: When used as a High-Reflection (HR) mirror, this N-BK7 glass can operate beyond the 400nm-2000nm range. Since the laser beam does not penetrate the material, it maintains stable reflection performance for specialized wavelength requirements.
Customizable Thickness: As a block glass, N-BK7 is not available as pre-cut natural blank sheets or standard-thickness panels. We offer fully customized thickness options-each order is tailored to your exact specifications, ensuring seamless integration into your optical designs.

Product Parameters

Thermal Properties:

Item	Value
Coefficient of Expansion:	7,1 x10^-6/K (-30 °C to +70 °C)
	8,3 x10^-6/K (+20 °C to +300 °C)
Viscosities:
Softening Point (107,6 dPa):	719 °C
Annealing Point (1013 dPa):	557 °C
Transformation temperature Tg:	557 °C
Thermal conductivity:	1,114 W/(m x K)
Specific heat capacity:	0,858 J/(g x K)(20 °C ; 100°C)

Mechanical Properties:

Item	Unit	Value
Density	g/cm^3	2.51
Yong's Module E	GPa	82 x 10^3 N/mm^2
Poisson's ratio μ		0,206
Compression strength	GPa	-
Bending strength	MPa	-
Tensile strength	MPa	-
Torsional rigidity	GPa	-
Vickers hardness	GPa	--
Knoop Hardness HK 0,1/20 (ISO9385)	-	610
Abrasion Aa*	-	ve = 63,96 vd = 64,17
Refractive index nd	-	-
Softening point	ºC	-
Annealing point	ºC	-
Strain point	ºC	-
Specific heat(26ºC)	kJ/kgK	-
Thermal conductivity ratio(26ºC)	cal/cm.sec.ºC	-
Thermal conductivity ratio(100ºC)	Cal/cm.sec.ºC	-

Refractive Index name	Wavelength (nm)	Refractive Index
ni	365,0	1.53627
nh	404,7	1,53024
ng	435,8	1,52668
nF'	480,0	1,52283
nF	486,1	1,52238
ne	546,1	1,51872
nd	587,6	1,51680
nD	589,3	1,51673
n632,8	632,8	1,51509
nC	643,8	1,51472
nc	656,3	1,51432
nr	706,5	1,51289
ns	852,1	1,50980
nt	1014,0	1,50731

Main Applying Fields:

Applying Fields:	Typical Applications 1).Demanding optical applications 2).Base material for precision optics 3).Windows, lenses, and prisms 4).Substrates for mirror and filter coatings 5).Measurement and sensor-technology use 6).Lenses and dispersion prims
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Our Advantages

Why Choose Our N-BK7 Glass?
Uncompromised Purity: Sourced from high-grade raw materials and manufactured under strict quality control, ensuring minimal inclusions and bubble-free composition-critical for laser component glass performance.
Tailored Solutions: Flexible customization of thickness and processing (e.g., polishing, cutting) to match your specific application needs, from small-scale laboratory projects to large-volume industrial orders.
Consistent Quality: Each batch undergoes rigorous optical testing (e.g., homogeneity checks, transmission measurement) to guarantee compliance with international optical glass standards.
Industrial Expertise: With years of experience in optical glass manufacturing, we provide technical support to help you select the right borosilicate crown glass specifications for your project, ensuring optimal performance and cost efficiency.

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 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.