BS 3423:1986

Foreword
Committees responsible
Recommendations
1 Scope
2 Glass quality
3 Design features
4 Symbols
5 Base thickness (design features A and F)
6 Body thickness and shape (design feature B)
7 Step thickness and radius of curvature (design
    feature C)
8 Flange thickness and shape (design feature D)
9 Lid thickness and curvature (design feature E)
10 Opening for vacuum (design feature F)
11 Grinding of flanges (design feature G)
12 Elastomeric joint seals (design feature H)
13 Tests
14 Size description of dessicators
Appendices
A Equations for calculation of minimum thickness of
    lids based on stress considerations only
B Hydraulic external pressure tests
C Polarized light test
D Test for ground flat flanges
Tables
1 Letter symbols
2 Minimum side-wall thickness
3 Minimum step thickness te for alpha = 55 degrees
    calculated using equation 3
4 Examples of flange thickness tf calculated using
    equation 4
5 Examples of lid and flange thickness tf calculated
    using equation 5
6 Minimum safe-handling thickness (te minimum) for
    lids
Figures
1 Common design of vacuum desiccator with flat ground
    flange
2 Common design of vacuum desiccator with grooved
    flange
3 Base with radiused corners
4 Base with sharp corners
5 Methods of reinforcing radiused corners
6 Curved side-wall with subsidiary curve at corner
7 Form of step
8 Alternative flange designs
9 Part-spherical form lid
10 Hemispherical form lid
11 Semi-ellipsoidal form lid
12 Dished form lid
13 Part-spherical form lid
14 Factor k4 for hemispherical and semi-ellipsoidal
    lids
15 Hydraulic test rig
16 Tensometer for polarized light test
17 Apparatus for testing ground flat flanges

Calculation of minimum glass thickness and recommends other design features; test methods appended.

This British Standard recommends minimum thicknesses and safety considerations for the design and construction of glass vessels for use under vacuum in a laboratory, including desiccators and filter flasks. Other configurations of desiccating vessels which are not for use under vacuum are outside the scope of this standard.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.