Kimax Squat Griffin Class A 3.3. Boro. Beaker 150ml. KIMAX® Low Form, Griffin, Class-A 3.3. Borosilicate glass beakers offer the same quality as Pyrex with excellent mechanical strength and durability, while providing high resistance to chemical attack and thermal shock. Design meets ASTM Specification E960, Type I requirements. Manufactured from 33 expansion, low extractable Borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.