ASTM C1048-25 PDF

Full title and description

ASTM C1048-25 — Standard Specification for Heat-Strengthened and Fully Tempered Flat Glass. This specification defines requirements for monolithic flat heat-strengthened (HS) and fully tempered (FT) coated and uncoated glass produced on horizontal heat‑treating systems for use in general building construction and related applications.

Abstract

ASTM C1048-25 covers kinds, conditions, fabrication, and performance requirements for heat‑treated flat glass (kind HS and kind FT) in uncoated (Condition A), spandrel/ceramic‑coated (Condition B), and other coated (Condition C) forms. It establishes production and acceptance criteria, notes limitations (for example, that glass cannot be cut after tempering), and describes relevant test requirements for coatings, surface condition, and resistance to alkali/acid exposure. The standard applies to products processed on horizontal tempering systems and excludes vertically treated or bent glass.

General information

• Status: Active
• Publication date: January 1, 2025
• Publisher: ASTM International
• ICS / categories: 81.040.30 (Glass products)
• Edition / version: C1048-25
• Number of pages: 9

Scope

The standard specifies requirements for monolithic, flat, heat‑strengthened and fully tempered coated and uncoated glass produced on horizontal heat‑treating systems for building construction and similar uses. It excludes bent glass and heat‑treated glass produced on vertical tempering systems. SI units are the standard; other units are informational. Safety and test‑method caveats are noted for users to address applicable safety and regulatory practices.

Key topics and requirements

• Definitions of kinds: Kind HS (heat‑strengthened) and Kind FT (fully tempered).
• Conditions: Condition A (uncoated), Condition B (spandrel — one surface ceramic coated), Condition C (other coated glass).
• Fabrication requirements: all cutting, edgework, drilling, notching, grinding, sandblasting, etching and similar fabrication shall be performed prior to heat treatment.
• Mechanical and optical considerations: strain patterns, surface and edge compression/strength characteristics, and limitations on post‑treatment cutting.
• Coating requirements: expansion fit and porosity testing for ceramic coatings and acceptance criteria for spandrel surfaces.
• Durability tests: specimen preparation and tests for resistance to alkali and acid as prescribed.
• Application limits: guidance that roll wave, bow, and support/deflection characteristics should be considered in design and specification.

Typical use and users

Used by architects, façade and glazing specifiers, structural engineers, glazing and glass fabricators, quality and testing laboratories, building code officials, and manufacturers of heat‑treated flat glass to specify, produce, inspect, and verify heat‑strengthened and fully tempered glass for building and architectural applications.

Related standards

Commonly used alongside ASTM standards for flat glass and testing, including ASTM C1036 (Flat Glass), ASTM C1172 (Laminated Architectural Flat Glass), ASTM C1422 (Chemically Strengthened Flat Glass), and test methods such as ASTM C1651 (measurement of roll‑wave distortion). C1048-25 revises and replaces earlier editions of C1048 (for example C1048-18).

Keywords

heat-treated glass, heat-strengthened glass, fully tempered glass, HS, FT, spandrel glass, ceramic coating, surface compression, edge compression, strain pattern, tempering, flat glass, architectural glass

FAQ

Q: What is this standard?

A: ASTM C1048-25 is the ASTM International specification that sets requirements for monolithic heat‑strengthened (HS) and fully tempered (FT) flat glass produced on horizontal heat‑treating systems for use in buildings and related applications.

Q: What does it cover?

A: It covers kinds and conditions of heat‑treated flat glass, fabrication-before‑tempering requirements, coating criteria (including spandrel/ceramic coatings), performance and test requirements (including coating porosity and resistance to alkali/acid), and design considerations related to strain patterns and glass support/deflection.

Q: Who typically uses it?

A: Architects, glazing and façade specifiers, glass manufacturers and fabricators, testing laboratories, structural engineers, and building code officials use this standard to specify and verify heat‑treated flat glass products.

Q: Is it current or superseded?

A: C1048-25 is the active current edition, replacing earlier editions such as C1048-18.

Q: Is it part of a series?

A: It sits within ASTM Committee C14 (Glass) standards and is commonly used with related flat‑glass specifications and test methods (for example C1036, C1172, C1422, and C1651).

Q: What are the key keywords?

A: Key keywords include heat-treated glass, heat-strengthened, fully tempered, tempered glass, spandrel, ceramic coating, strain pattern, surface compression, and flat glass.