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Premium manufacturer of Borosilicate 4.2 glass, reflex & transparent gauge glasses, pharmaceutical glass, and customized non-standard solutions trusted by global industries.
With a complete quality control and service system, every batch of our product is traceable from raw material to tempering — ensuring unmatched reliability and performance.
Our products meet international standards and have passed ASME, DIN, and JIS testing protocols for industrial safety and performance.
12+ years of expertise in gauge and sight glass production with precision tempering, cutting, and customization capabilities.
Orders completed on time with secure packaging and global shipping to meet your project deadlines without compromise.
Engineered for durability, clarity, and thermal resistance — our Borosilicate 4.2 glass series sets the benchmark in industrial and pharmaceutical applications.
Borosilicate 4.2 with high optical clarity and thermal shock resistance up to 150°C.
Borosilicate 4.2
Precision-etched prismatic surface for clear liquid level indication in pressure vessels.
High Pressure
Durable circular glass for inspection ports in pipelines, reactors, and tanks.
Sight Glass
Multi-level gauge glass for accurate fluid monitoring in industrial boilers and separators.
Industrial Use
Flat tempered borosilicate sheets for custom fabrication and specialized enclosures.
CustomizableNeutral 5.0 glass tubing for vials, ampoules, and drug containment systems.
Pharma GradeTailored dimensions, shapes, and finishes for unique engineering requirements.
Made to OrderThermal resistance up to 300°C with low coefficient of expansion for stability.
Heat ResistantFounded in 2012, Pujiang Yewt Glass Technology Co., Ltd. has over 12 years of experience in manufacturing high-performance gauge glass and sight glass solutions. With a team of 46 dedicated professionals and an annual production value of approximately $5 million USD, we serve clients across industrial, automotive, food, and medical sectors.
Our factory has implemented a comprehensive quality control system, including raw material traceability, equipment calibration, and finished product testing — ensuring every glass component meets the highest standards.
We recently partnered with China Building Material Group on pharmaceutical neutral 5.0 glass tubing and achieved a technological breakthrough in Metaglas sight glass development.
Our high-performance glass solutions are trusted in critical environments where safety, clarity, and durability are non-negotiable.
"All the goods listed are received and quality good. The sales are professional and give me good suggestion on material choosing. The order are finished in time and packing is safe."
Borosilicate 4.2 is a high-purity glass with excellent thermal shock resistance, low thermal expansion, and high chemical durability — ideal for industrial gauge and sight glass applications.
Yes, we specialize in customized non-standard glass solutions including unique dimensions, shapes, drilling, and edge finishing to meet your exact specifications.
Yes, our products meet international standards and have passed ASME, DIN, and JIS testing for safety and performance in pressure and high-temperature environments.
We serve industrial, automotive, food processing, medical, pharmaceutical, and chemical industries with reliable sight and gauge glass solutions.
We're ready to provide service for customers at any time. If you're interested in our products or have any questions, feel free to reach out.
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