India’s leading glass portal
  • Home
  • About Glazette
  •                                       
  •             
  • Register
  • |
  • Sign-in
G+FacebookTwitterYoutubeRSSLinked In
  • FEATURES
  • VIDEOS
  • WEBINARS
  • GLASS RESOURCES
    • Processing Glass
      • Tempered Glass
      • Heat Strengthened Glass
      • Laminated Glass
      • Insulated Glass
      • Ceramic Printed Glass
      • Heat Soaked Glass
      • Fire Resistant Glass
      • Low-emission GLass
      • Reflective glass
    • History of Glass making
      • Disc process
      • Glass History
    • Float Glass
      • Float Glass Production Process
    • Glass Types
      • Bullet Proof Glass
      • Self-Cleaning Glass
      • Body-tinted Glass
      • Etched Glass
      • Acid-Etched Glass
      • Low-emission GLass
      • Sandblasted Glass
      • Liquid Crystal Glass
      • Photovoltaic Glass
      • Bent Glass
      • Enamelled Glass
      • Electrically Heated Glass
      • Electrochromic Glass
      • Electrochromic Vacuum Glass
      • Satin Glass
      • Burmese Glass
      • Annealed Glass
      • Crown Glass
      • Dichroic glass
      • Tiffany Glass
      • Fused glass
      • Wired Glass
      • Chemically Strengthened Glass
      • Patterned glass
      • Frosted glass
      • Smart Glass
      • Spandrel Glass
      • Foam Glass
      • Anti-Fogging Glass
      • Hurricane-Resistant Glass / Hurricane Proof Glass
    • Tools & Calculators
  • CONTESTS
    • Transparence 2014
    • World Habitat Day 2011
      • Quiz
      • My Green City
      • Wall Poster
    • Bio Diversity 2011
    • Creativity & Innovation
    • Green Building Contest
    • NASA Utopia 10
      • Express Yourself
      • Beyond the Break
      • May I Help You
      • La Dicte
      • Caught in the Web
      • Style Icon
      • Twitter
  • JOBS
    • Search Jobs
    • Add Jobs
  • MEMBERS
    • Membership Benefits
    • Become a Member
    • Women's Day 2012 Featured Members
    • Associate Club Members
  • SEARCH
    • Custom Search
    • Search for Member
    • Advanced Member Search
Crown Glass

Crown glass was one of the two most commonly used types of glass for windows up until the 19th century, the other being blown plate glass. The process of making crown glass was first perfected by French glassmakers in the 1320s. Crown glass is made without lead, chiefly by fusing fixed alkali with silica sand, to which is added some black oxide of manganese – which gives the glass a tinge of purple.

For the best crown glass, the ingredients must be prepared in the same manner as for mirrors, and mixed in the following proportions: 60 lbs. of white sand, 30 lbs. of pearlash, and 15 lbs. of nitre, 1 lb. of borax, and 1/2 lb. of arsenic.

Crown Glass Making Process

crown glassA blowpipe is dipped into melted glass, which is then blown into the form of a large globular bottle. A rod tipped with a blob of hot glass is so placed that the blob or "punty" sticks to the centre of the bottom of the blown globe. Spinning the semi-molten ball then causes it to flatten and increase in size, but only up to a certain diameter.
The globe is then detached from the blowpipe, heated, and rotated vigorously until it whirls out by centrifugal force into a flat disc or "table" having a blob or "bullion" of glass in the centre.

The finished “table” of glass was thin, lustrous, highly polished (by “fire-polish”), and had concentric ripple lines, the result of spinning; crown glass was slightly convex, and in the centre of the crown was the bull’s eye - a thickened part where the pontil was attached. This was often cut out as a defect, but later it came to be prized as evidence of antiquity. Nevertheless, and despite the availability of cheaper cylinder glass (cast and rolled glass had been invented in the 17th century), crown glass was particularly popular for its superior quality and clarity.

This process allows the colour range to be limitless; crown glass is used ecclesiastically, commercially, domestically and for restoration purposes.
 

 
Glazette
Thought Leaders

Rajan Govind
Glass Academy Board Member
& Facade Specialist, BES Consultants


M Anand
Senior Counsellor – CII GBC
R Subramanian
Chairman – Glazing Society of India

Sriram N
IGBC accredited Professional & GRIHA Trainer

Deepa Sathiaram
Founder – Director, EN3 LEED Professional

S Srinivas
Principle Counsellor - IGBC LEED accredited Professional

Quick Search
Members (12893)
Become a Member of India's Leading Glass Portal - Join Now!

Architects  (4737)
Builders  (543)
Dealers  (460)
Fabricators  (839)
Facade Consultants  (305)
Guest Users  (1490)
HVAC Consultants  (80)
Interior Designers  (1624)
Processors  (118)
Students  (2617)
Window Makers  (80)


Newsletter Sign-up


Subscribe to get updates on glass, architecture,green movement, design trends in glass, events for students
Glass Knowledge Bank
Tempered Glass
Heat Strengthened Glass
Laminated Glass
Insulated Glass
Ceramic Printed Glass
Heat Soaked Glass
Fire Resistant Glass
Low-emission GLass
Reflective glass
Disc process
Glass History
Float Glass Production
Bullet Proof Glass
Self-Cleaning Glass
Body-tinted Glass
Etched Glass
Acid-Etched Glass
Low-emission GLass
Enamelled Glass
Photovoltaic Glass
Sandblasted Glass
Bent Glass
Smart Glass
Tiffany Glass
Crown Glass
Wired Glass
Green Buildings
Electrochromic Glass
Sustainable Design
Liquid Crystal Glass
Spandrel Glass
Fire Resistant Glass
Ceramic Printed Glass
Electrically Heated Glass
Glass History
LEED | BEE
© The Glass Portal with Resources on Glass in Green and Sustainable Architecture, Interior Design and Innovations in Glass.
No part of this site should be used in any other media without prior permission. Terms of Use and Legal Disclaimer   |   Contact Site Admin   |   Sitemap
Website Design and Online Marketing: Niyati