This is the Glassco 25ml Conical Flask, it also called erlenmeyer flask with narrow mouth. Flasks, Heavy Duty, Conical (Erlenmeyer) Narrow Mouth, ISO.

Conical Flask 25ml (Erlenmeyer) Narrow Mouth
Made from ASTM E-438 Type 1, Boro 3.3 heat resistance glass
Complies with ISO 1773
All the flasks are printed in white enamel
Has a Reinforced thick Rim to reduce chipping & breakage
Brand: Glassco
Capacity: 25ml
Origin: UK

Key Features:

⚗️ Premium Borosilicate Glass: Withstands high temperatures and chemical reactions without cracking.
🧪 25ml Capacity: Ideal for micro-scale laboratory work and educational use.
🔥 Heat & Chemical Resistant: Suitable for use with Bunsen burners, hot plates, and laboratory equipment.
💧 Narrow Neck Design: Prevents spillage and allows easy sealing with rubber stoppers.
📏 Clear Graduation Marks: Printed for accurate and easy volume measurement.
🧼 Reusable & Durable: Long-lasting glass construction allows repeated sterilization and use.