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Glass volumetric flask (brown, Class A)

The glass volumetric flask (Brown Class A) is a light‑protected, high‑precision volumetric measuring instrument made of brown high‑borosilicate glass, specifically designed for preparing light‑sensitive standard solutions and reagents that are prone to photodecomposition.

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Glassware and Measuring Instruments

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lbt@lbt.ltd

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+86-15102211717

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Description

Product Introduction:

The glass volumetric flask (brown, Class A) is a light‑protected, high‑precision volumetric measuring instrument made of brown high‑borosilicate glass. It is specifically designed for preparing light‑sensitive standard solutions and reagents that are prone to photodecomposition. The flask body fits tightly with a ground‑glass stopper, ensuring excellent sealing to prevent evaporation and leakage of the solution.

The graduation lines are produced using photolithography and firing, ensuring clear, uniform markings that resist fading and are easy to read. The narrow, elongated neck provides high volumetric accuracy, effectively minimizing volume errors. This product meets Class A precision, with minimal capacity error and traceable measurement values, complying with relevant standards and laboratory regulations.

Application scenarios

It is widely used in universities, research institutions, environmental protection agencies, the food industry, the pharmaceutical sector, the chemical industry, and third-party testing laboratories, serving as a metrological instrument for preparing standard solutions, performing precise quantitative pipetting, conducting volumetric analyses, and carrying out titration experiments.

Technical Specifications:

Single-Graduated Volumetric Flask Parameter Table

Specifications	Tolerance value	Bottle mouth inner diameter	Overall height	Minimum wall thickness	Quantity/Box	Quantity/Box
1ml	±0.010	7mm	60mm	0.7mm	10 per box	210/piece
2ml	±0.010	7mm	60mm	0.7mm	10 per box	210/piece
5ml	±0.020	7mm	75mm	0.7mm	10 per box	210/piece
10ml	±0.020	7mm	90mm	0.7mm	10 per box	210/piece
25ml	±0.03	8mm	110mm	0.7mm	10 per box	210/piece
50ml	±0.05	9mm	140mm	0.7mm	10 per box	210/piece
100ml	±0.10	13mm	170mm	0.7mm	5 per box	150 per piece
200ml	±0.15	15mm	210mm	0.8mm	2 per box	60/piece
250ml	±0.15	15mm	220mm	0.8mm	2 per box	60/piece
500ml	±0.25	18mm	270mm	0.8mm	2 per box	32/piece
1000ml	±0.40	21mm	300mm	1.0mm	2 per box	24 per item
2000ml	±0.60	25mm	380mm	1.2mm	1/box	8/piece

Large-Volume Single-Graduation Volumetric Flask Specification Sheet

Specifications	Tolerance value	Bottle mouth inner diameter	Overall height	Minimum wall thickness	Quantity/Box	Quantity/Box
5ml	±0.020	9mm	75mm	1.2mm	10 per box	210/piece
10ml	±0.020	9mm	90mm	1.2mm	10 per box	210/piece
20ml	±0.03	9mm	100mm	1.2mm	10 per box	210/piece
25ml	±0.03	9mm	110mm	1.2mm	10 per box	210/piece
50ml	±0.05	13mm	140mm	1.2mm	10 per box	210/piece
100ml	±0.10	15mm	170mm	1.5mm	5 per box	150 per piece
150ml	±0.13	15mm	190mm	1.5mm	2 per box	60/piece

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Does your pipe pressure burst testing machine control test temperature automatically? What’s its main application?

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Customer Reviews

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From Thomas Bennett, Quality Director, UK plastic pipe factory

2026.06.05

★★★★★

“We have purchased two sets of pipe testing equipment from Laibote (Tianjin) for 18 months. The ring stiffness and hydrostatic burst testing machines run stably for daily batch inspection, test data matches ISO standard requirements precisely, and the intelligent test software is easy for our operators to master. Their after-sales team offers timely remote technical guidance whenever we have operational problems, spare parts supply is efficient. We have arranged a second bulk order for our new production workshop and will recommend Laibote’s testing machines to our industry partners across Europe.”

Middle East Construction Lab｜Purchase: Universal Electronic Testing Machine & Geotextile Test Equipment

From Mohamed Kareem, Lab Manager, UAE third-party construction inspection institute

2026.06.05

★★★★★

“We compared multiple testing equipment brands from Europe and China before cooperating with Laibote. Their WDW universal tester and full-set geotextile testing instruments meet local construction testing standards perfectly. Custom fixtures tailored per our specimen specifications save much testing time. Pre-sale technical communication was patient and professional; engineers provided online operation training after goods arrived. Stable machine performance greatly improves our laboratory’s detection efficiency, we are satisfied with cost performance and overall service.”

Southeast Asia Rubber & Polymer Factory｜Purchase: Vicat Softening Point & Tensile Testing Machine

From Tanaka Hiroshi, R&D Supervisor, Indonesia rubber materials enterprise

2026.06.05

★★★★★

“Laibote’s Vicat softening point tester and electronic tensile machine have been applied to our raw material incoming inspection and new formula development for over one year. High testing accuracy effectively controls our product defect rate. What impresses us most is their responsive after-sale service; technical staff reply our troubleshooting requests within 24 hours even for time zone differences. Compared with expensive European brands, Laibote’s equipment balances quality and price excellently, we plan to expand procurement of auxiliary testing instruments next quarter.”

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Glass volumetric flask (brown, Class A)

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