SIST EN 3862:2014

Overview

EN 3862:2013 is a European material standard from CEN for chemically tempered soda‑lime float glass used in aerospace transparencies. Intended as part of the EN aerospace non-metallic materials series, this level‑3 document defines the requirements for universally available and high light‑transmission glass plies supplied in the final condition of use. It was approved by CEN on 17 November 2012 and prepared in accordance with EN 4385 and TR 7000‑5.

This standard targets manufacturers, aerospace designers, procurement specialists and quality engineers who specify or accept glass transparencies for aircraft and related applications.

Key Topics

• Material scope: Soda‑lime float glass plies, chemically tempered, for aerospace transparencies.
• Grades and types: Multiple grades (A03 through A19 and B08) are defined with associated thickness bands and designation as Type A (universally available) or Type B (high light transmission).
• Optical characteristics:
  • Light transmission requirements by grade (visible range), with Type B offering the highest transmission.
  • Haze limited to ≤ 1%.
  • Refractive index specified as n = 1.52 ± 0.01.
• Physical properties:
  • Density: 2.50 ± 0.02 g/cm³.
  • Coefficient of linear thermal expansion: 88.5 ± 3.5 × 10⁻⁷/K.
  • Surface compression stress and modulus of rupture: to comply with limits agreed during product qualification (specified during qualification rather than as a fixed value in the standard).
• Delivery and handling:
  • Supplied in final condition of use (processing condition 1.013).
  • Storage: suitable conditions avoiding surface condensation.
• Quality and acceptance:
  • References EN 3001 for technical specification, test methods and acceptance criteria.
  • Batch acceptance criteria are highlighted as mandatory for routine acceptance.

Applications

EN 3862:2013 is focused on practical aerospace use of glass transparencies where high optical clarity and reliable supply are required. Typical applications include:

• Aircraft cockpit and cabin windows where high light transmission and low haze are critical for visibility.
• External transparent panels and inspection windows requiring consistent optical performance.
• Replacement and retrofit components where universally available grades ensure supply chain continuity.

Benefits for users:

• Clear, standardized acceptance criteria for optical and physical properties.
• Consistent supply specification across CEN member states.
• Alignment with aerospace material series (EN 4385) and existing technical specifications (EN 3001).

Related Standards

• EN 3001 - Tempered float glass plies for aircraft applications (technical specification referenced by EN 3862).
• EN 4385 - General organisation of non‑metallic materials standards and links between standard types.
• TR 7000‑5 - Rules for drafting and presentation of glass transparency material standards.

For procurement and qualification, reference EN 3862:2013 together with EN 3001 to ensure full test methods, dimensional tolerances and batch acceptance procedures are met. Always consult the national implementation of the CEN standard and the manufacturer’s product qualification records for agreed strength and stress limits.