When it comes to high-performance glass tubes, you might hear two names that dominate the conversation. One is “Quartz” and the second is “Borosilicate”. Both of these are widely used in numerous industries, from critical ones like scientific research and semiconductors to usual ones like lighting and chemical processing. However, despite their similar appearance and likely characteristics, they are fundamentally different and come with unique properties, costs, and applications.
No matter whether you are a purchasing manager, an engineer, or even a product developer, deciding between these two glass types is a crucial step. Therefore, we have brought this comprehensive guide that will ultimately help you understand the major differences, strengths, limitations, as well as ideal use cases for each of them.
What is a Quartz Tube?
Quartz glass is also known as fused quartz, and it is manufactured through the purest form of silica. The primary benefit of quartz tubes is their thermal resistance and longevity. It also comes with properties like high-temperature resistance, thermal shock resistance, clarity, and chemical purity.
What is a Borosilicate Tube?
A borosilicate tube not only contains silica but also an amalgamation of boron trioxide. When both of them are merged together in a highly delicate way, borosilicate glass is the output. These are known for their impressive thermal shock resistance, low coefficient of thermal expansion, convenient processing, and smooth surface.
Composition and Manufacturing
As already elaborated, quartz tubes are manufactured from nearly pure silicon dioxide (SiO₂). It also depends upon the grade, like they may be manufactured through electric fusion, which makes them fused quartz, or chemical vapor deposition. The second method of manufacturing quartz glass makes it of this type called “synthetic quartz”. Resultantly, an extremely pure material that is great for ultra-sensitive and high-temperature applications is achieved. This is also the reason why quartz is often preferred in industries like semiconductors, photonics, and aerospace, where even minute impurities can be disastrous.
On the other hand, borosilicate tubes contain around eighty percent silica. The remaining composition consists of boron trioxide, sodium oxide, and aluminum oxide. This is a perfect blend that magically reduces thermal expansion while improving chemical durability when compared to ordinary glass types. Moreover, borosilicate glass is widely used in laboratory glassware, household kitchenware such as Pyrex, and countless other industrial components.
The manufacturing methods for both quartz and borosilicate also differ. Quartz tubes usually require electric or flame-oriented fusion under strictly controlled conditions. While borosilicate is softer and lower melting point. It can be processed using more common glassblowing or other extrusion methods with minimum cost and complexity.
Heat Resistance and Thermal Shock
Heat resistance is a significant property that is focused on before choosing between quartz and borosilicate tubes. Following is a comprehensive breakdown of the differences in terms of heat resistance and thermal shock:
Quartz Tubes
- These specialized tubes can endure continuous temperatures exceeding 1,100°C (2,012°F)
- Usually, the melting point remains around 1,650°C (3,002°F)
- These glass tubes come with a remarkably low thermal expansion coefficient (~5.5 x 10⁻⁷ /°C) that offers exceptional thermal shock resistance
- Quartz can withstand rapid heating and cooling without any deformations, like cracking
Borosilicate Tubes
- They can operate for up to 500°C (932°F) with a sufficient melting point of around 820°C (1,508°F)
- Borosilicate tubes comes with higher thermal expansion (~3.3 x 10⁻⁶ /°C) than quartz tubes
- They also provide decent thermal shock resistance, but cannot be comparable with the extreme limits of quartz tubes
Verdict
When it comes to heat resistance and thermal shock capabilities, quartz is a clear winner. You can use these quartz tubes as furnace tubes, UV curing lamps, and critical products in semiconductor processes.
Purity and Chemical Resistance
Quartz is known for its ultra-high purity due to its chemical formulation. No matter in fused or synthetic forms, it has the ability to achieve over 99.99% SiO₂ content. This content is free from contaminants such as sodium or calcium. Therefore, quartz tubes prove to be an ideal choice for environments where even small trace metals could interfere with processes. One such example is their application in semiconductor wafer production as well as in photonic sensor calibration.
In contrast, Borosilicate glass has reliable chemical resistance but not the same purity level as quartz does. However, it is suitable for some general laboratory and chemical applications, but its boron and sodium content have a tendency to leach out under extreme pH or temperature conditions. This phenomenon can lead to contamination in different scenarios.
Quartz tubes can resist virtually all acids except one, which is called hydrofluoric acid. These tubes can also resist numerous chemical bases. Moreover, quartz tubes are non-porous as well as non-reactive. Borosilicate also comes with resistant properties to many chemicals, but there are certain limitations, like its highly alkaline nature, and it cannot work properly in acidic environments.
Verdict
It is advised to use quartz tubes if you need purity over other aspects. Moreover, these tubes also provide unmatched chemical stability like never before.
Optical and UV Transmission
Sometimes, light transmission plays a phenomenal role in many technical applications such as spectroscopy and UV sterilization. We have completely broken down the optical properties of both glass tubes.
Quartz Tubes
- It is an incredible ability of quartz tubes to transmit ultraviolet light down to 185 nm (deep UV). It makes them ideal for germicidal lamps, photolithography, as well as analytical equipment
- These tubes are also transparent to IR wavelengths. It means quartz tubes allow the use of IR lasers and heating elements
- For specific light filtration, quartz tubes are available in numerous characteristics, like transparent, translucent (opaque), and doped grades
Borosilicate Tubes
- These are transparent in the visible range, but can block ultraviolet (UV) light below around 300 nm
- Borosilicate tubes are mostly suitable for visible spectrum work and some near-IR use cases. Some examples include lab glassware or visible-light lighting systems.
Verdict
Quartz is undoubtedly superior in optical clarity across the UV and IR spectrums, but it also depends upon your budget and specific project requirements.
Mechanical Strength and Durability
Both of these glass tube options offer good mechanical performance, but the strength is different.
Quartz Tubes
The hardness of quartz tubes is quite reliable, with around Mohs 7. It also provides more resistance to scratching and surface wear. These tubes become brittle under high mechanical shock due to their rigid molecular structure.
Borosilicate Tubes
These tubes are lower in hardness as compared to quartz tubes, with a hardness of around 5.5 Mohs. These tubes also provide better resistance to impact and vibration. These are more forgiving under rough handling or sudden drops as compared to their counterparts.
Verdict
If you have a minimum budget, going for borosilicate might be a feasible option. However, quartz is better in numerous ways and installations. If there is a strong prediction for impact, borosilicate could be a good option to consider.
Electrical Insulation
Quartz has some excellent dielectric properties that make it widely acceptable in high-voltage, high-frequency, and RF applications. It also remains non-conductive at elevated temperatures and may provide a low-loss medium for electrical energy.
Borosilicate, on the other hand, provides electrical insulation but suffers from decreased performance as the temperature rises. Therefore, it is mostly suitable for low-to-moderate temperature insulation and general-purpose electric appliances.
Verdict
Quartz tubes dominate in the area of electrical and electronic component design. Whereas, borosilicate is a good option if your project does not require higher electrical insulation.
Cost Comparison
This is the most fundamental consideration that most people have while choosing between borosilicate and quartz tubes.
Price of Quartz Tubes
These are expensive due to raw material purity as well as factors like controlled manufacturing and limited supply. The usage and applications of quartz in high-performance areas justify its cost. If you need more customizations, the price may go higher.
Price of Borosilicate Tubes
These are the most economical and widely available glass tubes for your project. For bulk applications, the price becomes more cost-effective. Moreover, these borosilicate glass tubes are simple to fabricate, cut, and bond in numerous settings.
Verdict
If cost is a defining and concerning factor for you, borosilicate tubes are a better option.
Application Use Cases
The following is a reliable breakdown of the difference between the applications of these two.
| Application | Quartz Tubes | Borosilicate Tubes |
| UV Sterilization | Required for UV-C transmission | Not suitable, but it blocks UV-C rays |
| Semiconductor Fabrication | Preferred due to purity and chemical resistance | Unsuitable due to potential contamination |
| Laboratory Glassware | Best for ultra-sensitive or high-temperature reactions | Great for general chemical usage scenarios |
| High-Intensity Lighting | Used in UV, IR, and HID lighting | Works for standard lamps |
| Analytical Instruments | Ideal for spectroscopy and photonics | Limited to visible-range instruments |
| Industrial Furnaces and Reactors | Withstands repeated high-temp cycling | Cannot endure the same temperatures |
| Medical and Biotech Equipment | Non-reactive, high-purity for diagnostic tools | Suitable for general bio applications |
| Food Processing | Safe and durable, but overqualified | Often, it depends upon the material of choice |
Fabrication and Customization
Quartz can be molded and customized into nearly any shape. However, it requires specialized tools and techniques to do that. Some quartz tube customization processes include flame fusion and CNC-based grinding. The fabrication mostly includes:
- Customized bore sizes
- Ability to keep ends either open or closed
- Ground flanges
- Customized optical polishing
- Multi-bore configurations in different scenarios
Borosilicate glass is far easier to shape using standard glassblowing methods and does not require specialized methods. Most importantly, borosilicate glass tubes can be bent, joined, and annealed without requiring extreme temperatures.
At Shenxun, we offer engineered quartz and borosilicate solutions to exacting tolerances as per your requirements. We have expertise in manufacturing all types of quartz and borosilicate tubes, such as custom reactor tubes or lighting sleeves. Every product is tailored to meet your specific project requirements and other dimensions.
Environmental Impact and Longevity
Quartz
It is highly durable and recyclable to cope with environmental concerns. Even in high-heat and high-chemical settings, it offers a long lifespan. It also offers a lower environmental footprint over time due to fewer replacements.
Borosilicate
Borosilicate is also recyclable and non-toxic in most scenarios. Moreover, as compared to quartz, it is easier to source but requires more frequent replacement in challenging environments.
So, for sustainability-focused projects, both of these options are great, but you have to choose one. Quartz may provide better lifecycle value despite the fact that it might require additional cost at the start.
Frequently Asked Questions (FAQs)
Can Borosilicate replace Quartz in any application?
Yes, it can replace quartz, but only where temperature, purity, and UV transparency are not that critical. Some examples include basic lab glassware where high purity is not required. Household lighting components can also be manufactured through borosilicate tubes instead of quartz.
Is Quartz stronger than Borosilicate?
Quartz is normally harder and more scratch-resistant, but it’s more brittle. Borosilicate is recommended in environments where mechanical impact may occur.
Are there different grades of Quartz and Borosilicate Tubes?
Yes, there are different grades for both of them. For instance, synthetic quartz offers higher purity than usual fused quartz. Likewise, borosilicate glass tubes also come in various lab and industrial grades.
Where can I buy custom Quartz or Borosilicate Tubes?
With more than two decades of professional experience, Shenxun is the best glass manufacturer in the world. It supplies both custom and standardized options with full customization, engineering support, and remarkably fast turnaround.
What are the common failure points in Quartz and Borosilicate Tubes?
Usually, Quartz really breaks due to sudden mechanical impact, although it is resistant to heat. Borosilicate, on the other hand, tends to degrade faster in extreme chemical and thermal environments.
Are Borosilicate Tubes food safe?
Absolutely! Borosilicate tubes are widely used in kitchenware and laboratory settings. It also involves food and beverages. Therefore, it’s completely and thermally safe for food.
Conclusion: Which One Should You Choose?
Choosing between borosilicate and quartz totally depends on your preferences. It is not only about the budget but also about the performance, reliability, and long-term results. You should go with quartz if your application involves high temperatures, UV or IR exposure, electrical insulation, and chemical purity.
In contrast, you should go for the borosilicate if your project requires budget efficiency, general use, lower temperature and visible light needs. Both of these tubes serve important roles within their domains. At Shenxun, our experts will help you find the best option for your project. Contact us now!