Science folks, this TN Lab Erlenmeyer flask is the real deal for your home lab, classroom, or professional workspace! Made from heavy-wall borosilicate glass 3.3, this 500ml conical flask can handle temperature extremes from -180°C to 500°C without cracking - seriously impressive stuff. The narrow neck design is perfect for mixing without splashing, and it comes with a matching rubber stopper that creates a tight seal for safe storage and transport. The printed graduations make measuring liquids accurate and easy, while the large marking area lets you label your experiments clearly. With an outer neck diameter of 35mm, bulb diameter of 110mm, and height of 180mm, it's the perfect size for most common laboratory applications. Borosilicate glass is highly resistant to most chemicals and leaching, so you don't have to worry about contamination affecting your results. Manufactured to ISO 9001 standards, you're getting professional-grade quality that stands up to repeated use. Whether you're a student, teacher, hobby chemist, or professional researcher, this flask delivers reliable performance. The rubber stopper fits snugly to prevent evaporation and contamination - no more makeshift covers that don't quite work right. It's one of those fundamental lab pieces that every science enthusiast needs in their collection. The quality is immediately apparent when you hold it - substantial, well-made, and designed to last through years of experiments. If you're tired of cheap glassware that chips easily or doesn't hold up to temperature changes, this borosilicate flask is definitely worth the investment.