SCHOTT B270
SCHOTT B270 is an ultra-white modified sodium calcium glass with high transparency, which is widely used in the optical field. It is favored for its excellent optical properties and excellent processing characteristics. B270 has a transmittance of up to 92% in the visible range, which can be increased to more than 99% when treated with an anti-reflective coating, ensuring a clear field of view in a variety of optical applications. The glass has a uniform refractive index and minimal variation, making it suitable for use in precision optical systems. In addition, the thermal expansion coefficient of B270 is 9.4 × 10⁻⁶ K⁻¹, showing good thermal stability, and can maintain stable performance in the environment with large temperature changes. It also has excellent anti-ultraviolet ability, which can effectively resist the influence of solar radiation. Easy to process and suitable for mass production, the B270 is widely used in lenses, filters, displays and other optical components. Its high surface quality and geometric size make it ideal for a variety of high-precision optical applications.
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Excellent UV resistance:The B270 performs well under solar radiation, with an offset of less than 2 nanometers at the UV edge, ensuring its durability and stability in outdoor environments.
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High light transmittance:B270 has a transmittance of up to 92% in the visible range, making it excellent in a variety of optical applications, especially where high transparency is required.
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Uniform refractive index:The refractive index of the glass varies very little, ensuring consistent optical performance at different thicknesses and sizes, which is essential for precision optical systems.
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Good thermal stability:B270 has a high coefficient of thermal expansion (9.4 × 10⁻⁶ K⁻¹), can maintain good stability in the environment of large temperature changes, suitable for a variety of optical applications.
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Easy to process:The material is easy to process and form, helping to achieve high cost effectiveness and suitable for mass production.
B270® Flat Glass:
To meet different market demands, SCHOTT offers the well-known B270® crown glass in flat sheets. B270® glass produced by the up-drawing method has the following characteristics:
Features:
a) High stability to sunlight
b) High transmittance in the visible light range
c) High stability of thermal and chemical properties
d) Fire polished surface
Applications:
a) CD/DVD optical connection system
Optical components, such as polarizing beam splitters, mirrors and prisms that require optical connection systems, are composed of B270®.
Glass sheets of various thicknesses, their high transmittance and practicality can ensure good performance of optical connection systems.
b) Digital projection:
Due to its high transmittance and practicality on thin sheets, many optical components, such as P/S converters, integrator lenses or dichroic filters, are made of B270®. B270® flat glass is easy to produce and easily coated, which gives the glass processor the flexibility to manufacture the desired product.
c) CRT door phone gift:
CRT intercom systems for the B270®, including monitors, are a popular application. Since B270® has a fire-polished surface and is stable when exposed to the sun, a non-processed version of the glass can be used as the cover panel.
d) Gifts:
Due to the unique blend of glass with other parts and beautiful appearance, B270® can be used in many decorative areas such as artwork, shelves and watch glasses.
e) Touch screen pad
Nowadays, many computer drive systems are equipped with touch screen pads. B270® provides a coefficient of expansion and responsiveness relationship that makes our glass attractive.
f) Coated monitoring glass
B270® can be used as a test glass to evaluate coatings. In order to check the machine settings and ensure the accuracy of the measurement results, this procedure requires the glass to be able to increase its high transparency.
Technical Data:
a) Dimensions: 406 mm x 258 mm, 840 mm x 800-920 mm,
1680 mm x 800-920 mm (16.0 in x 10.1, 33 in x 31.5-36.2 in,
66.1 in x 31.5-36.2 in) other sizes upon request
b) Thickness: from 0.8mm to 10mm
c) VD65 light transmittance (d=2.0mm): 91.7%
d) Linear thermal expansion coefficient α (20 °C; 300 °C): 9.4 ´10–6 K–1
e) Transformation temperature (Tg): 536°C
f) Dielectric constant εr at 1 MHz: 7.0
g) Refractive index (nD): 1.5229
h) Density (ρ): 2.56 g/cm
SCHOTT B270 applications：
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