SCHOTT B 270® i Glass | Specifications & China-Made Alternatives

SCHOTT B 270® i Glass

Original Manufacturer Reference · SCHOTT · Optical crown glass

Product Overview

Clear optical crown glass with high visible transmission, established optical constants and broad use in optical and technical components.

Typical Applications

Optical windows and filters
Imaging, sensing and illumination components
Technical glass parts requiring stable optical properties

Reference Specifications

The following values are condensed from the supplied manufacturer data sheet. Test conditions are retained where they affect interpretation.

Refractive index / Abbe number	nD ≈1.5229; Vd 58.0 (Ve 57.7 ±0.6)
Luminous transmittance	91.7% at 2.0 mm reference thickness
Density	2.56 g/cm³
Young’s / shear modulus	71.1 / 29 GPa
Poisson’s ratio	0.226
CTE	9.4 × 10⁻⁶ K⁻¹, 20–300°C
Tg / annealing / softening point	542 / 535 / 711°C
Thermal conductivity	1.02 W/(m·K) at 90°C
Chemical resistance classes	Hydrolytic HGB 3; acid S2; alkali A1

China-Made Alternative Products

A Chinese optical-glass option is selected by refractive index/Abbe value, spectral transmission, homogeneity, bubble/inclusion class, thickness and chemical durability, with coated or finished-part samples where needed.

Recommended matching criteria:

Chinese optical crown and technical glass
Polished windows, filters and custom shapes
Optical and coating qualification

Target modelCritical parametersCandidate gradeSample testingBatch qualification

Customization and Processing

Round wafers, square panels, windows and custom outlines
Precision cutting, edge grinding, chamfering and laser processing
Single- or double-side polishing, thinning, cleaning and marking
TTV, warp, roughness, dimensional and optical inspection to agreed criteria

Qualification Note

Important: “Alternative” means a candidate selected for the same application target. It does not mean an automatic drop-in replacement or identical composition. Final acceptance is based on agreed specifications, samples, test reports and process verification.

Request Material Matching

Manufacturer and product names are used only to identify reference materials and technical targets. Semicon Global Tech is an independent supplier and does not claim manufacturer authorization unless explicitly stated. Original-grade data and China-made alternative specifications are presented separately; supply specifications are confirmed by quotation, COA and approved samples.

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