Turn-Secure Rack

A SBS-standard test tube rack for receiving a SBS-standard test tube rack compliant screw-capped test tube of length (l) and diameter (d), said rack comprising:

• a top tier, support structure and a bottom tier, said support structure located between said top tier and said bottom tier, said top tier and bottom tier being, when assembled to form said rack-, spaced apart a distance smaller than said length (l) by said support structure;
• said top tier comprising a plurality of apertures of aperture diameter (da) larger than said diameter (d), said apertures arranged to form a 2-dimensional array of apertures in said top tier;
• said bottom tier comprising a friction tier and a support tier;
• said friction tier facing said top tier when said rack is assembled;
• said friction tier comprising a high friction material;
• wherein, when said rack is assembled, there is formed an array of rack wells, each rack well comprising an aperture, a well bottom of well bottom diameter (dw) larger than said diameter (d), located opposite said aperture, and optionally a well enclosure connecting said well bottom to said aperture either in a straight manner or conically tapering towards said well bottom, such that said aperture diameter (da) may be either slightly larger or of the same diameter as said well bottom diameter (dw);
• and
• wherein when said rack is assembled, said well bottom is formed from said high friction material comprised in said friction tier.