Category Archive: Glass Materials

Unique Applications for Soda Lime Glass

soda lime glassSoda lime glass is characterized by the greenish tinge from which it gets its name. It is a cost-effective, clear float glass that’s simple to fabricate and makes up approximately 90% of produced glass. Manufacturers can produce soda lime glass by floating the material over molten tin where it softens and forms into glass sheets. Soda lime glass is a versatile material that possesses a variety of unique properties and benefits that lend themselves to many applications.

What Is Soda Lime Glass?

Fabricators can produce basic soda lime glass from a mixture of compounds like lime (calcium dioxide), silica (silicon dioxide), soda (sodium oxide), and other elements that can imbue the glass with different properties. Soda glass has a history stretching back hundreds of years, with multiple variations and production techniques that have created a wide range of different types. Soda lime glass can also serve multiple applications, ranging from consumer goods and packaging to manufacturing. Soda lime glass can even be fabricated for specific scientific applications.

Not only is soda lime glass extremely versatile, but it’s also a sustainable material. Manufacturers can recycle soda lime glass by softening, remelting, and reforming it multiple times without the risk of diminishing its physical properties.

Unique Applications for Soda Lime

Product manufacturers across virtually every industry use soda lime glass to create consumer, commercial, and industrial goods. Some of the most common applications include:

  • Electrical and Electronics: Soda lime acts as a high-voltage insulator ideal for electronic devices.
  • Food and Beverage: Soda lime glass can be used to create food and beverage packaging.
  • Natural Gas, Oil, and Petrochemical Processing: When tempered, soda lime glass can withstand high temperatures and volatile compounds, making it an ideal choice for manufacturing fluid control process components and parts. 

Types of Soda Lime Glass

By introducing different mineral and chemical compounds into the lime, soda, and silica mix — and by using different finishing processes — fabricators can produce different types of soda lime glass properties. Some glasses offer additional strength characteristics or greater resistance to chemicals and volatile compounds. Still, others may be clear or hold different colors. Four of the most popular soda lime glass formulations are:

Guardian Clear Float Glass

This soda lime glass is visibly clear and transparent. It’s also free from distortions, making it an excellent choice for consumer goods, window panes, and any applications where the finished product will be visible or end-users must be able to see through the glass. Guardian Clear Float Glass is available in multiple different size and thickness options to accommodate the specifications of custom projects.

Vitro Clear Float Glass (formerly a PPG product)

Vitro Clear Float Glass is also clear, visually appealing, and doesn’t have visible flaws in the glass that mar its appearance or functionality. It’s a versatile product that can be used in a wide range of consumer, commercial, and industrial products, and manufacturers can reliably produce consistent orders of Vitro Clear Float Glass.

Vitro Solargray® Glass (formerly a PPG product)

Vitro Solargray Glass is a specialized type of glass with a distinct cool, medium-gray coloring. This glass can mitigate solar heat gain, as well as glare from sunlight, making it a popular choice for environmentally-friendly constructions. Commercial buildings frequently have Solargray Glass installations to reduce strain on the HVAC systems and reflect heat away from the interior of the building.

LimeX by Swift Glass

Swift Glass’s unique LimeX soda lime glass is an extra-thick glass product that can be fabricated in sheets as thick as 1.25 inches without compromising on strength or integrity. Our production team can also enhance the glass’s durability and strength by tempering it.

Turn to Swift Glass for Custom Soda Lime Glass

At Swift Glass, we specialize in creating high-quality glass for original equipment manufacturers (OEMs). We serve the global market with curated glassworking solutions and processes, and our services include:

  • CNC machining
  • Drilling
  • Chemical strengthening
  • Thermal tempering
  • Polishing

Our company has been a leading provider of glass services for nearly 100 years. We’re committed to quality, and our company is ISO 9001:2015 certified and ITAR registered. Contact us today to learn more about our capabilities or to start your soda lime glass order.

The Benefits of 3D Printing on a Glass Surface

From aluminum and glass to acrylic and thermoplastic polyurethane, there are many options on the market for printer bed materials. However, it’s essential to choose carefully, as the quality of any 3D printed object starts with its first layer of substrate. For that reason and many more, glass has emerged as a top choice for 3D printer beds in recent years.

3D printing involves high amounts of heat that create warping and deformation in materials like plastic or aluminum. Suboptimal printer bed materials that are not completely flat can cause flaws in the first layer, dooming the project. Glass, specifically a special type called borosilicate glass, is ideal for 3D printing in a wide range of applications. Below, our team at Swift Glass explains in detail why this material is best for ensuring optimal part quality and performance.

6 Reasons to Print on Glass

benefits of 3d printing on a glass surfaceEven if your 3D printer didn’t come with a glass bed, it may be worth the investment to replace and upgrade it. The price of glass to upgrade your printer bed should be the only cost, but the return on investment results in many benefits. Some of the many reasons to choose glass for a 3D printer bed include:

1. One-time setup: Other materials require adhesion promoters that are one-time use only. The 3D printer glass bed needs only a one-time setup, as opposed to many printer bed materials that require periodic replacement and recalibration to level the bed.

2. Easy to clean: Glass is easy and quick to clean. Since glass has the perfect level of adhesion, it needs no promoters like glue or hair spray that must be cleaned and reapplied after each use.

3. Consistency: Aluminum printing beds are rarely completely flat even when new, and they continue to warp with heat or stress. Unlike aluminum or other materials, glass has less of a tendency to deform under pressure. Printing on an ideal flat surface like glass ensures the bed remains level after each print job.

4. Durability: Other alternative materials like Kapton tape, painter’s tape, and plastic print surface sheets are only good for one print job. Glass does not wear out, meaning you don’t need to worry about replacement.

5. Cost-Efficient: The price for glass is relatively low. Glass is flat, level, and durable, so there is rarely a need to replace it. When you consider that it leads to less waste, requires little maintenance, and rarely needs replacing, it is easily the most budget friendly option over time.

6. Effortless print removal: Some adhesion is vital to the success of your 3D printing project. However, too much can cause problems with the removal of the object. Glass naturally has the ideal surface adhesion for 3D printing, as it holds the item steady during the project, then easily releases it when completed.

Glass for 3D Printer Beds

glass for 3d printer beds

Like any material, price and quality vary between types of glass. Soda-lime silicate is the least expensive. However, it contains air bubbles that make it less durable and more likely to crack under stress or heat. It is also vulnerable to chemicals, meaning that it can’t be cleaned with solvents.

The ideal 3D printer glass bed consists of borosilicate glass. This type of glass is a highly durable blend of silica and boron trioxide, chosen for cookware and lab equipment. It not only is chemical resistant, but it has no air bubbles, which means that it won’t crack when heated. Borosilicate glass is also consistently flat and smooth.

Because it has a low coefficient of thermal expansion, the removal of completed parts is effortless. Borosilicate glass expands minimally during heating and therefore contracts minimally while cooling. The contraction results in parts popping easily off the glass surface with no tools or force required.

3D Printing Bed Materials From Swift Glass

3D printing on a glass bed provides many benefits over traditional options. Borosilicate glass is a high-quality, consistently flat glass with supreme thermal shock and chemical resistance and a high level of durability under repeated stress. It is one of the most versatile 3D printing bed materials available, ensuring a level substrate to build consistently even layers.

Swift Glass is an ISO 9001:2015 certified and ITAR registered company that is widely regarded as a leader worldwide in fabricating quality glass parts. We invite you to review our 3D printing portfolio to learn more about custom glass for 3D printing applications. For questions about the benefits of borosilicate glass in 3D printing applications, contact our team today.


Properties of Glass Materials

In general, glass is a hard and brittle substance that is usually transparent or translucent. It may be comprised of a fusion of sand, soda, lime, or other materials. The most common glass forming process heats the raw materials until they become molten liquid, then rapidly cools the material to create hardened glass.

Swift Glass is an industry leader in glass fabrication. We stock materials from a wide variety of glass manufacturers, such as:

  • Vitro
  • GE

Each material we stock is carefully selected for its physical properties and unique performance capabilities.

Some of our offerings include:

  • Different varieties of sight glass for use across a broad spectrum of industries
  • SCHOTT BOROFLOAT® Glass, which is utilized in a variety of lighting, optical, and glass wafer applications for its beneficial properties, which include excellent mechanical strength, resistance to extreme temperatures, and exceptional transparency
  • Silica float glass for windows and displays
  • Pyrex® (discontinued) for use in both low- and high-pressure environments
  • Vycor® (discontinued) for optical applications that operate under highly pressurized, high temperature conditions

The Key Differences Between Transmission & Transmittance and How to Apply Them to your Application

From magnifying glasses to tinted windows to one-way mirrors, people prize glass for its ability to transmit (or not transmit) light.

Measuring light transmission and transmittance plays a huge role in selecting an appropriate type of glass for your needs. Transmittance measures the amount of light able to pass through a material without the material reflecting or absorbing it. Therefore, transparent glass will transmit 100% of light, translucent material only allows some light to come through, and opaque glass will achieve close to 0% transmittance.

A few key differences exist between light transmission and transmittance. Understanding the distinction between these two terms will help you select the perfect type of glass for your application.

Transmission vs. Transmittance

Transmission refers to the amount of incident light that successfully passes through glass or other material, and it’s usually expressed as a percentage of light that made it through the material. On the other hand, transmittance refers to the amount of light that a material disperses, effectively resulting in an inverse value of that found for transmission.

There are two basic types of transmission—external and internal—and both differ from light transmittance:

  • External transmission is calculated from the intensity of the incident light as it enters the glass versus the light’s intensity after exiting the glass. This transmission measurement technique provides an accurate figure of the actual amount of light allowed to pass through a material.
  • Internal transmission is determined by the light’s intensity once it has entered the glass versus its intensity after it leaves the glass. Internal transmission primarily measures the light filtration ability of the glass itself, allowing you to get a more accurate idea of the glass’s properties.
  • Transmittance refers to the amount of light energy that the glass absorbs, scatters, or reflects. It’s measured using the formula T = I/I0, with T denoting the transmission intensity, I indicating intensity, and I0 indicating intensity at the start. This calculation allows you to determine the ratio of transmitted radiant power to incident radiant power, giving a greater idea of a glass’s ability to block photons.

How Does Transmittance Apply to My Application?

Transmittance values can vary based on which application or common industry nomenclature they use.

For example, while most manufacturers measure industrial glasses in terms of external transmittance, they usually measure filter glasses in internal transmittance. This is because manufacturers can put an anti-reflective (AR) coating on the glass’s surface, reducing the amount of light intensity lost to reflection.

A couple of common applications that measure transmission include:

  • Testing window tint or films for cars, homes, and businesses. Desired tint levels will correspond with the amount of light the glass transmits.
  • Measuring glass clarity. Many industries have stringent specifications governing the use of glass in assembly regarding both external or internal transmission. For instance, FAA specifications for airport and aerospace applications typically govern the product’s external transmission potential.

It’s also good to keep in mind that engineers who design optics for extreme environments must recognize that each type of glass will have slight variations in chemical, thermal, and mechanical properties, all of which factor into their ability to reflect and absorb light.

Glass for All Occasions at Swift Glass

At Swift Glass, we pride ourselves on having delivered industry-leading custom glass manufacturing services for almost 100 years to OEMs across the country. Our experience and dedication to customer success enables us to understand our customers’ intricate needs and exceed their expectations.

We’re an ITAR-registered, ISO 9001:2015–certified company and a worldwide leader in fabricated glass parts. We offer holistic assistance in glass crafting, material selection, and custom design, maintaining a high standard of precision and quality.

To learn more about the optical properties of glass, download our latest eBook here, and don’t hesitate to contact us today if you have any questions.

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Understanding the Refractive Index of Glass

Understanding the behavior of light can be an important factor when determining which glass materials to use for your manufacturing process. When light passes through a substance, it decreases in velocity. This is manifested by an increase in the substance’s refractive index. Much can be learned about the optical properties of a glass material by looking at its refractive index.

Refractive index is useful for various reasons. For one thing, it can be used to calculate the focusing power of lenses and the dispersive power of prisms. It can also be used in estimating the thermophysical properties of hydrocarbons and petroleum mixtures.

What is the Refractive Index?

Also commonly referred to as the index of refraction, the refractive index, n, measures a ray of light as it travels from one medium to another. As it begins to travel through a material, the interaction between electrons and photons reduces the speed of light. As the density of the electrons increase, the velocity of light becomes slower.  This is why light moves at its highest possible speed in a vacuum, where no electrons hamper its speed.

Knowing the refractive index – among other thermal, chemical and physical properties – helps ensure that the glass material you’re considering for your application is suitable for its intended use.

Determining the Refractive Index of a Material

The ratio between the speed of light in a vacuum and the lower velocity of the light as it travels through a given material enables us to determine the refractive index of a given material.

In addition, the amounts of transmitted and reflected light will determine not only the refractive index of a glass material, but also its angle of refraction. This is because light gets transmitted and reflected as light rays pass through the surface of a glass material.

The light’s transmission angle can be calculated using Snell’s law:

The discrepancy between the light’s transmission and the incidence angle becomes bigger as the index of refraction becomes larger. When this occurs, there is a change in the existing refractive index between the glass and the surrounding medium.

When Θi = 0°, the amount of reflected light can be determined using the following formula:

Lastly, the intensity of light is reduced by an average of 4% due to lost reflection from the surface of most glass materials with a 1.5 refractive index.

A change in the index of refraction due to changes in wavelength is known as chromatic dispersion.


Swift Glass has been providing custom glass manufacturing services for nearly a century, and providing high-quality solutions to OEMs is one of our core principles. Our experience and dedication to customer service enables us to understand the intricate needs of our customers, and to exceed their basic needs.

An ITAR registered, ISO 9001:2015 certified company, Swift Glass is a privately-owned global leader in the quality fabricated glass parts. Swift Glass offers assistance in craftsmanship, material selection, and manufacturing of custom solutions, and design, while guaranteeing high quality and precision.

To learn more about the optical properties of glass, download our latest eBook, Understanding the Optical Properties of Glass today!

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Alternative Materials to the Discontinued Corning® Vycor® Glass

Material Options to Substitute for Corning® Vycor® Glass

Invented by Corning in 1939, Corning® Vycor® Glass has been used in a wide range of applications over the years, from laboratory equipment to early spacecraft viewing ports.

A blend of 96% silica and 4% boron trioxide, Corning® Vycor® Glass is a high-temperature glass valued for its low coefficient of thermal expansion — 7.5 x 10-7/°C when measured between 0 °C (32 °F) and 300 °C (572 °F). It also features excellent thermal shock resistance and superior optical qualities.

Recently, however, Corning discontinued Corning® Vycor® Glass, and now companies across various industries are searching for reliable alternatives.

Quartz: A Viable Corning® Vycor® Glass Replacement

Among dozens of types of glass, quartz is one of the best replacements for Corning® Vycor® Glass. Extremely versatile, quartz — like Corning® Vycor® Glass — is a high-silica glass, as it’s produced from naturally occurring quartz, which is composed entirely of silica dioxide. Because quartz is naturally occurring, quartz glass may have residual levels of impurities, but these typically only affect ultraviolet transmission.

Like Corning® Vycor® Glass, quartz has superior optical properties and strong thermal performance variables, including high working and melting temperatures, thermal shock resistance, and low coefficient of thermal expansion. Quartz also exhibits strong resistance to corrosion caused by atmospheric gases, water, and acid, and has good electrical properties.

Versatile and reliable, quartz is an ideal Corning® Vycor® Glass replacement for any project that requires strong, high-performance glass.

Learn More

Although quartz is an excellent Corning® Vycor® Glass alternative for many applications, you may require a different material depending on the intended end use of the glass. Extreme applications, in particular, often necessitate a different Corning® Vycor® Glass substitute.

Founded nearly 100 years ago, Swift Glass Co. is an industry-leading manufacturer of fabricated glass parts. Over the decades, we’ve developed a wealth of expertise working with a variety of glasses, many of which are well suited for use as Corning® Vycor® Glass alternatives.

To learn more about glass materials that can withstand extreme temperatures, download our free eBook, “Creating Glass That Withstands Extreme Environments,” or contact the team today to discuss your specific needs.

Download: Creating Glass That Withstands Extreme Environments

What’s the Right Thickness for your Sight Glass?

Used in a range of industries and applications, sight glass is used to check the level of liquid in a reservoir or supply line. Critical tools for ensuring operations are running safely and smoothly, these transparent tubes or windows allow users unimpeded observation in order to monitor conditions in piping, vessels, chemical reactors, and other industrial equipment.

Because sight glass is made from sturdy glass substrates, it can be used in harsh conditions and can withstand high temperatures and pressures, as well as chemical attacks. Sight glass may be subjected to thermal shock, caustics, abrasives, and impacts. But only properly designed, appropriately thick sight glasses will offer reliable resilience.


Sight Glass Thickness Design Considerations

sight-glassSpecific sight glass design will depend on the specific application, so it’s important to carefully consider the exact conditions the glass will be exposed to and any potential hazards or special requirements. Various internal and external forces can impact the strength of glass components, and even minute flaws in the glass can lead to failure, so selecting the appropriate thickness is crucial.

Glossing over these preliminary considerations can result in a subpar design, increasing the risk of sight glass failure. This wastes both time and money, as projects must be stopped until the equipment can be repaired or replaced. Even more importantly, these failures can be extremely dangerous to the operator and surrounding workers, resulting in injury or even death.

There are several factors to consider when selecting sight glass thickness, but temperature and pressure, in particular, play key roles.


When designing sight glass, it’s important to consider any temperature extremes in which it will operate, determine whether the temperature will fluctuate, and pinpoint the highest and lowest possible temperatures. Certain glass types perform differently depending on the temperature range. For example, soda lime glass can be used at temperatures less than 300 °F, while borosilicate glass can be used at temperatures up to 500 °F. Quartz or sapphire glass should be used for temperatures greater than 500 °F. 


Pressure can also fluctuate greatly during operations, but it’s first important to understand that pressure is classified in multiple types: Working pressure is the greatest pressure allowable in an operating environment; design pressure is the maximum pressure the specific system has been designed to withstand; test pressure is generally specified by end users in order to ensure that components not just meet but exceed safety requirements; and burst pressure is essentially what it sounds like — the amount of pressure that can be applied before failure. (Burst pressure tests are usually only conducted in highly sensitive or critical applications, such as nuclear facilities.)

The various pressure capabilities of sight glass assemblies are determined by the material, thickness, and unsupported diameter, and both normal operating pressure and peak upset pressure should be taken into consideration when creating sight glass thickness specifications.

Find the Glass Thickness You Need

As a worldwide leader in the manufacture of quality fabricated glass parts, Swift Glass has years of experience fabricating sight glass for many applications. To make the process for our customers even easier, we’ve created a glass-thickness calculator; simply type in the unsupported diameter of the glass you’re working with, as well as the PSI it needs to withstand, and it will provide the recommended thickness to ensure optimal strength and durability. If you already have the unsupported diameter and the thickness of the piece of glass you’re working with — enter those values and calculate the PSI it will be able to withstand.


Watch our video!

5 Common Glass Edge Finish Types

Glass materials can receive many different types of glass edge treatments, each of which will uniquely affect the overall functionality and performance of the finished piece. Edging can improve safety, aesthetics, functionality, and cleanliness while improving dimensional tolerance and helping to prevent chipping.

Below, we’ll explore five common glass edge types and their unique benefits.

Cut and Swipe or Seamed Edges

Also referred to as safety seams or swiped edges, this type of glass edging — in which a sanding belt is used to lightly sand off sharp edges — is primarily employed to ensure the finished piece is safe for handling. This style of edging does not provide a smooth, cosmetically finished edge and is not used for decorative purposes; therefore, this method is ideal for applications in which the edge of the glass piece will not be exposed, such as the glass installed into the frame of fireplace doors.

Grind and Chamfer (Bevel)

This type of edging involves flat grinding glass edges until they are smooth and then running the top and bottom edges along a belt to eliminate sharpness and remove chips. The resulting glass piece features a smooth chamfer top and bottom with an exterior ground edge. Available with straight or curved bevels, chamfered edges are most often seen on frameless mirrors, such as those on medicine cabinets.

Pencil Grind

Pencil grinding, achieved through the use of a diamond-embedded grinding wheel, is used to create a slightly rounded edge and allows for a frosty, satin, or matte glass finish. “Pencil” refers to the edge radius, which is similar to a pencil or C shape. This grind is also referred to as a Semi-Polished Edge.

Pencil Polish

Pencil polished glass edges are ground smooth, finished with a shiny or glossy polish, and feature a slight curve. The unique finish makes pencil polishing ideal for aesthetics-focused applications. Like pencil-ground edges, the edge’s radius is similar to a pencil or C shape.

Flat Polish

This method involves cutting the edges of the glass and then flat polishing them, resulting in a sleek appearance and shiny or glossy finish. Most flat-polished applications also employ a small 45° angle chamfer on the top and bottom glass edges to remove sharpness and “chatter” which can also be polished.

Learn More

Swift Glass can accommodate a variety of glass edgework methods. To learn more about the different types of edgework available, download our comprehensive Edgework Terminology Infographic, complete with multiple surface views and detailed descriptions of various glass edge types.

How Much Does Glass Cost? 3 Important Factors

If you’ve ever wondered why your glass order was quoted at a certain number, you are not alone.

“What makes up the cost of my glass?” is one of the most common questions we get here at Swift Glass.

There are a variety of factors that contribute to the price of a glass part — the quantity of the order and the size of your glass piece being the two most obvious factors. Here are three other notable considerations.


irregular shaped glassAdvances in manufacturing technology have led to advances in glass shaping capabilities. Processes like state-of-the-art glass drilling, waterjet cutting, and computer numerical control (CNC) machining can all be applied to glass shaping.

Today, glass parts can have virtually any shape, from standards like squares and circles to highly complex organic, irregular, and geometrical shapes. The more complex the shape of your glass, however, the more advanced technologies required to produce it. The use of advanced machining processes adds to your glass prices.


edge-grindingThere are many different forms of edgework that you could specify for your glass part, and they all have an impact on the price of glass.

The most basic edgework, a simple cut, is required for virtually every glass part as a matter of course, and will have minimal to no impact on the cost of glass.

Cut and swipe, a swipe being a very slight bevel, will increase your glass price modestly. Very complex edge grinding, such as special or custom bevels, could increase the cost of glass considerably.

Strengthening & Tempering

heat strengthened glassStrengthening and tempering procedures — additional steps performed after your parts are cut — increase your glass prices. If your glass parts are going to be used in a challenging environment and face exposure to extreme heat, pressure, stresses, or chemicals, a strengthening processes is likely required.

Chemical strengthening processes are best for glass that will encounter wind load and thermal stress, while thermal tempering is ideal for glass that will be used in high pressure, high heat, and explosive environments.

Get More Price Factors

The glass price factors here are only a small sample — there are dozens of considerations that go into the price of a glass quote. To learn more about the different ways glass cost is determined, download Swift Glass’s latest guide, What Affects the Price of My Glass?

Learn how your glass quote is calculated

Download the Guide >



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