For those who fabricate and assemble their own apparatus, we offer BOROSIL® Brand Ground Glass Conical Joints. These are precision ground high quality interchangeable joints suitable for rapid and convenient assembly of apparatus for majority of laboratory applications. BOROSIL® Brand Ground Joints are manufactured from medium wall uniform tubing and careful attention is paid to accuracy of form, uniformity of surface finish, profile and taper to reduce the possibility of leakage and joint ?seizure?. The outer joints have extra glass tooled onto rims to add a chip resistance. All BOROSIL® brand Ground Joints are triple tested for proper taper control, for mating and for vacuum. The taper is as required by Bureau of Indian Standard Specifications.