The Complete Guide to Auto Glass Installation: A Textbook

Overview

The Complete Guide to Auto Glass Installation is a comprehensive textbook on auto glass replacement and repair. It outlines the safe and proper installation and repair of all auto glass used in domestic and foreign motor vehicles and off road equipment. The Guide is written by two experts who have 42 total years of experience in the auto glass industry and 36 years of training experience in both technical and customer service.
The Guide is written with the student in mind. It ...
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Overview

The Complete Guide to Auto Glass Installation is a comprehensive textbook on auto glass replacement and repair. It outlines the safe and proper installation and repair of all auto glass used in domestic and foreign motor vehicles and off road equipment. The Guide is written by two experts who have 42 total years of experience in the auto glass industry and 36 years of training experience in both technical and customer service.
The Guide is written with the student in mind. It includes easy, understandable step by step instructions illustrated with color photography, diagrams and tables. It aids the instructor with learning quizzes and exams.
In the event of an accident, auto glass installed incorrectly can result in serious injury and possible death for the vehicle occupants. Correct auto glass installation:
· enhances vehicle performance
· aids in proper accessory operation
· contributes to safety equipment deployment
· Improves vehicle appearance
· Provides for the customers' comfort and safety.
This Guide not only helps the student learn how to put in auto glass but also teaches why the correct procedures are important. Improper auto glass installation can endanger the vehicle occupants and cause undue liability exposure to the installation shop. This Guide teaches the proper procedures according to Federal Motor Vehicle Safety Standards and the ANSI/AGRSS Safety Standard.
Auto glass installation is too important to the well being of the consumer and to the long term success of the repair shop to put the responsibility into the hands of others. Auto glass technicians and auto collision professionals must maintain the highest standard of safety glazing. This Guide aims to assist in that endeavor.
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Product Details

  • ISBN-13: 9781463441487
  • Publisher: AuthorHouse
  • Publication date: 8/30/2011
  • Pages: 372
  • Sales rank: 1,202,631
  • Product dimensions: 8.50 (w) x 11.00 (h) x 0.97 (d)

Read an Excerpt

The Complete Guide to Auto Glass Installation


By Bob Beranek Ann Schuelke

AuthorHouse

Copyright © 2011 Bob Beranek & Ann Schuelke
All right reserved.

ISBN: 978-1-4634-4148-7


Chapter One

The "Wind Shield"

What is the purpose of the windshield in a modern vehicle? Is it a weather barrier, a projectile shield, a bug screen? In reality, a windshield is all those things and more, including a safety device. It is as important to your security while on the road as a seat belt, child seat, or even the air bag.

The windshield is designed to keep occupants from being thrown from the vehicle in case of a frontal impact, to support the roof in a rollover accident and to position the passenger-side airbag for the most effective protection. Properly bonding that windshield to the vehicle's body is paramount to the safety of the occupants.

This course is designed to help you understand the changing role of glass in the automobile, including its introduction, production, and evolution, and ending with new innovations that will make driving easier and safer in years to come.

Course objectives

The objectives of this course are as follows:

• Learn the primary ingredients of glass.

• Understand glass manufacturing processes

• Be familiar with the history of auto glass development.

• Know what constitutes safety glass.

• List the numerous roles auto glass plays in the modern automobile

• Be familiar with auto glass technology

Auto Glass History Glass basics

Glass is a material made naturally, when extreme heat and sand are combined. This material, first found at the foot of volcanoes, is called obsidian. The first use of obsidian was for jewelry and other decorative products. Later, it was used for arrowheads, cutting utensils, and weapons. As the centuries passed, artisans learned to alter glass, after heating it, to form many usable items such as drinking vessels, bowls, and window glass.

Raw materials

Modern glass is made up of four major ingredients; sand, soda ash, dolomite and limestone. Each of these materials contributes to the success of the manufacturing process. Silica sand contributes as much as 70% of the glass recipe. Soda ash, the most expensive ingredient in glass, provides easier melting of the raw materials. Dolomite provides better working and weathering properties. Limestone adds to the durability of the finished product. Most glass manufacturers also utilize recycled glass, called cullet, in the manufacturing process. In addition to reducing material costs, cullet also melts at a lower temperature, thus reducing energy costs.

Once the glass is manufactured and cut to shipping sizes, it is sent to be fabricated. Fabrication is the act of refining a manufactured item into a finished product for sale. When auto glass is fabricated, it becomes a windshield or a tempered auto glass part. A windshield today is made up of the two pieces of annealed glass with polyvinyl butyral (PVB) sandwiched in between. A tempered piece is a single piece quickly cooled to provide extra impact resistance, as we will explain later in this chapter.

Methods of manufacture

There are two types of manufacturing processes used in making glass, the sheet method, and the float method.

To make glass using the sheet method, the glass is vertically stretched, in the molten state, to the desired thickness. Because the quality capabilities are very limited with this process, today this flat glass method of production is usually found only in less developed countries.

The float method is by far the most widely used process, today. The float method starts with the raw materials, mixed and melted in a refractory tank. Once the molten glass is melted and refined, it is forced through a narrow opening onto a bed of molten tin. Glass is lighter than molten tin, so it floats, much like oil on water. The glass is then slowly cooled to a temperature of 1130°F, where it becomes rigid and is lifted off the molten tin by a series of lift out rollers. The glass is then slowly cooled or annealed. This allows the glass to be cut and shaped later.

Early history

Horseless carriage

On the first automobiles, there were no windshields. The speed of the Model T's was only a few miles per hour, much like the speed of a galloping horse, thus the name "horseless carriage". The few safety problems included bugs and debris getting into one's eyes. Most occupants of the early vehicles protected themselves with long coats, sometimes referred to as "slickers", and goggles.

Glass introduction

As vehicle engine power increased, so too did the demand for further comforts and protection from flying projectiles. The first use of a windshield on a motor vehicle was on racecars. A round, glass windscreen was mounted directly in front of the driver to improve the visibility. This new addition to the automobile became a popular option for road worthy cars between the periods of 1907 and 1910.

Most car owners of the time enjoyed the fact that the automobile was an open-air vehicle. The air rushing by their bodies lent a sense of exhilaration, not felt in slower moving carriages. This is why most of the new windshields were installed into movable frames to allow airflow through the vehicle.

When vehicles started to reach speeds of 25 miles per hour and more, it decreased the exhilaration of having the wind in one's face. In 1910, the Cadillac was the first vehicle to have an all enclosed body. This new advance in vehicle design increased in popularity, between 1915 and 1920 and greatly increased the use of glass.

Ford discovery

Before 1920, the role of auto glass was primarily for comfort. However, as roadways improved, speeds increased and the popularity of the motor vehicle grew, the role of auto glass was changed. In the early 1920s, vehicle accidents increased dramatically due to vehicle population on the roadway. The first windshields were constructed of a single sheet of annealed glass. When annealed glass breaks, sharp shards of glass would fly into the face and bodies of the occupants, thus causing serious injuries. It is estimated that in 1923, half of all persons injured in auto accidents were hurt by broken glass.

It is said that a friend of Henry Ford's received serious injuries due to glass breakage when he was involved in an auto collision. This caused Henry Ford to investigate a new invention called laminated glass. A French scientist by the name of Edouard Benedictus accidentally dropped a flask coated in dried out cellulose and discovered that the cellulose held together the glass shards of the dropped flask. This breakthrough led to the invention of laminated safety glass in 1913.

Laminated glass

The first generation of laminated glass was two panes of annealed glass with a coating of cellulose sandwiched in between. It was first used in the gas masks of World War I. Henry Ford realized that utilizing laminated glass technology in his automobiles would greatly decrease injuries due to glass breakage, and incorporated this safety glass into his new vehicle designs. By 1929, laminated glass was used in all of the new Ford vehicles. The introduction of laminated glass was the first time that glass played a direct role in the safety of a vehicle's occupants, but it wouldn't be the last.

Polyvinyl Butyral (PVB)

There were two major problems with the first generation of laminated glass as it aged; one, the discoloration of the cellulose inner layer, and two, the ease with which the cellulose could be punctured. These two problems were solved in the late thirties with the introduction of a material called polyvinyl butyral (PVB).

PVB is a plastic material that is usually .030 inches thick when used in a windshield. At that thickness it is very difficult to penetrate, even with the forces applied to it in an accident. It is also less susceptible to discoloration, making visibility better. By 1966 laminated glass containing PVB was required in all vehicles by Federal Motor Vehicle Safety Standard 205.

Increase in glass usage

By the mid to late 30s, glass usage increased dramatically in the new enclosed vehicle designs. The auto parts were primarily made out of laminated flat glass. The flat glass was cut to size and installed in metal frames or into rubber gaskets. The glass mounted in frames required cushioning to prevent fracture. The two materials used to cushion the frame-mounted glass were called "EverSeal" a rubber type material that absorbed oil and "Tuf-Pack" a cork and fabric material. Glass in gasket mounted parts was cushioned by the rubber of the gasket or weatherstrip.

Tempered glass introduced

As vehicles evolved, safety became a bigger concern. Tempered glass was developed in 1938 and soon began playing an ever-increasing role for the glass in doors, vents (sidelites) and for rear windows (backlites). Tempered glass was rapidly cooled after it was formed, causing it to develop an outer "skin" that made it stronger than laminated glass. Tempered glass had the flexibility to be formed to much more complex shapes with an overall thickness that was significantly less than the laminated glass. In addition to being stronger, it was cheaper to fabricate than laminated.

Tempered glass, unlike annealed glass, is quick cooled rather than slow cooled. This causes the outer surface to harden faster than the core. As the core hardens, it causes pressure on the outside surface, giving the glass additional strength to withstand the closing of the door. Unlike annealed glass that fractures into long sharp shards, tempered glass shatters into relatively small dull pieces. Almost all the glass found in today's cars and trucks is tempered, with the exception of the laminated windshield and the occasional laminated back glass. Look for an increase in laminated side parts in the future however, due to efforts to prevent ejection of occupants through the side glass in the event of a crash.

Introduction of curved windshields (1947 Studebaker Starlight Coupe)

Another huge innovation came in 1947 when Studebaker Motors designed the new Starlight Coupe with a curved windshield and back glass. Prior to this, all auto glass was flat and could be fabricated by any glass professional. Curved glass meant that the glass must be produced by special fabricating procedures not usually found in the typical retail glass shop.

Tinted/Sunshaded glass

After World War II, vehicle design incorporated curved glass on many parts of the vehicle. This change meant that glass covered a larger percentage of the vehicle's surface than ever before. Although this improved visibility, the bigger glass areas also increased solar heat gain. Glass manufacturers responded with the introduction of tinted glass. Iron oxide was added to the glass batch, adding a blue or blue-green color to the glass.

As technology grew in the lamination process, other advances were made to decrease infrared light absorption. Glass manufacturers were able to add a darker band of color at the top of the windshield, called the Sunshade, by applying a dye to the top of the PVB inner layer of the windshield.

Float glass (1959 UK Alistair Pilkington)

All early glass was manufactured by the sheet method, in which flowing molten glass is stretched onto a flat surface, ground to the desired dimensions and then slow cooled. This was a slow and arduous method of manufacturing glass, which also produced defects, distortions, and imperfections.

In 1959, Alistair Pilkington invented the float process. The process, which was described earlier, greatly improved the quality and the clarity of glass in the marketplace and has quickly become the method of choice by modern day glass manufacturers.

Fuel embargo

In 1973, the OPEC nations imposed a fuel embargo on United States and created an upheaval in the automotive industry. Fuel costs went from 25 cents for a gallon of gas to over a dollar per gallon almost overnight. In the United States, which depended heavily on affordable gasoline, this turn of events was catastrophic. Manufacturers had to completely redesign their new vehicles to compensate for higher fuel costs. At the time, it took approximately 7 years for a manufacturer to bring a new vehicle model from design to production. However, the vehicle manufacturers needed to reduce that time frame significantly to increase gas mileage. Some of the things that needed to be done were to:

• Downsize the vehicle.

• Make the vehicle more aerodynamic

• Redesign unibody construction.

• Increase glass surfaces

Obviously, the best way to save fuel is to reduce weight and size. Vehicle manufacturers reduced weight in every way possible. Manufacturers reduced the amount of steel in the vehicle, incorporated more plastic parts, and required more (and thinner) glass to be used in the vehicle's design. Glass has a smoother surface than paint thus reducing the drag coefficient. It is also lighter weight than steel, thus improving fuel efficiency.

New role for auto glass

With smaller and lighter weight vehicles on the road, the public became more concerned about occupant safety. In designing more fuel efficient automobiles, advanced crash dynamics were studied to determine the factors that go in to making vehicles safer. Much of the designed safety is dependent on the proper installation of the glass into the vehicle. The new role of auto glass includes:

• Reducing occupant ejection

• Support of the roof structure

• Positioning of passenger-side air bag

• Support to the firewall

• Better visibility

• Added security

Today's vehicles are safer than they have ever been. Auto glass and its proper installation are essential to this crash worthiness, whether that glass is installed by the vehicle manufacturer in its initial assembly or by the auto glass technician who replaces it in the aftermarket.

Urethane introduction

The added role put on auto glass, to protect occupants in a crash, meant that the glass must be bonded to the body of a vehicle by a strong and flexible product. This requirement was met by the introduction of polyurethane as the bonding adhesive. Urethane, as it is commonly known, is a very special moisture-attracting adhesive with tremendous bonding strength characteristics. In comparison, the prior glass adhesive, butyl, has approximately 30 pounds per square inch of tensile strength, while urethane has approximately 1000 pounds per square inch of tensile strength. This strength is necessary for windshield retention, roof support and airbag deployment in the event of a crash. The first use of urethane in a production vehicle was on a 1973 Oldsmobile Cutlass. The success of this adhesive paved the way in 1974 for General Motors and other vehicle manufacturers to incorporate it in their entire car lines as new models were introduced. Currently, every passenger vehicle and truck under 10,000 pounds gross vehicle weight uses urethane to bond the windshields to the car body.

Auto Glass Technology

Auto glass has come a long way from the flat piece of annealed glass found on early automobiles. Many modern auto glass parts have value added components that enhance safety, comfort, and styling. Let's take a quick look at some of the innovations incorporated into the new modern-day auto glass.

Diversity antennas

The introduction of antennas mounted in a windshield was realized in the early 1970s. However, the antennas of today not only improve radio reception, but can also be multitasking. These multitasking antennas are referred to as diversity antennas. Some of the jobs these antennas accomplish are:

• Improved radio reception

• Connection with global positioning satellites (GPS)

• Cellular phone reception

• Locks and unlocks the door by remote control

• Remote vehicle ignition

Some or all of these jobs can be accomplished with one or more antennas. Some are mounted on fenders, some on roofs and others fabricated on to the glass surface.

Bonded Glass

Bonded glass comes to the auto glass technician with parts already attached, for ease of installation. Some of the parts that can be bonded to the glass are:

• Moldings • Guides • Mounting Brackets • Regulators • Rain sensor lens

(Continues...)



Excerpted from The Complete Guide to Auto Glass Installation by Bob Beranek Ann Schuelke Copyright © 2011 by Bob Beranek & Ann Schuelke. Excerpted by permission of AuthorHouse. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

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Table of Contents

Contents

Acknowledgements....................3
The "Wind Shield"....................5
Regulatory Standards....................15
Personal Safety....................31
Tools....................45
Auto Glass....................77
Picking and Pricing Parts (NAGS)....................97
Adhesive Bonding....................121
Bonding Chain....................136
Miscellaneous Parts and Supplies....................151
Stationary Auto Glass Installation....................175
Moveable Auto Glass Installation....................227
Troubleshooting....................263
Windshield Repair....................283
Trade Math....................299
Pattern Making....................317
Glass Cutting....................331
Glossary....................351
Index....................361
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