I'll reply since no-one else has.. I think you're asking for a bit much from this product. It's a box of general-purpose heatshrink, for lab use. If you're actually planning on using heatshrink in a real product where such parameters are critical, the engineers in your organization should be providing the parameter values so you can buy the specific heatshrink in the actual dimensions and parameter values they require. A box of assorted heatshrink is not that.