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Premium High Borosilicate 250ml Round Bottom Flask for Labs. High Borosilicate Glass: Made from premium high borosilicate glass 3.3 for superior heat resistance and durability. Multiple Capacity Options: Available in 100ml, 250ml, 500ml, 1000ml, and 2000ml sizes to suit various lab needs. ISO9001 Certified: Manufactured under strict ISO9001 certification ensuring high quality and precision. Flexible Customization: Offers flexible customization options including OEM and ODM services for specific requirements. 100% Quality Inspection: Every finished product undergoes 100% visual and functional inspection before packing. Fast Delivery Options: Mall cargo delivery in 5-10 days; large cargo delivery in 10-20 days for urgent orders.