The line is the weakest element of the fishing set. It acts as a link between the rod and the fish. The effectiveness of this connection directly depends on its sensitivity, hence the widespread tendency to use fishing lines, if possible, thin and therefore delicate. Consistent adherence to the principle of selecting the most delicate line possible brings many benefits, m. in.: fishing with such lines gives much more satisfaction, and the results are good. Therefore, when choosing a fishing line, it must be carefully inspected from all sides: you should get your bearings, what is its cross section, mechanical properties, elasticity and strength at knots.
The same starting material is the common denominator for the entire range of lines produced (polyamide 6 or a modified polyamide 6) and a substantially similar technological process. All producers are making efforts to improve the physical and mechanical properties of the lines, especially endurance (primarily at the nodes), softness, elasticity and color. However, improving all indicators in one product is problematic, so the output consisting in the production of many types is chosen – each of them has only one feature improved. Thanks to this, the trade offers many specialized types of lines intended for fishing of various types (hard, extra hard, soft).
Only sparse thickness information is given on the line spool labels (it should also be treated with reserve, it is often bigger) and strength in kilograms (determination of the value of the load in kg for a length load perpendicular to the section 1 m). The usefulness of the above data is at least limited, because they refer to "dry."”. Polyamide line, even if the layman finds it strange, absorbs water, which has a very negative effect on some of its mechanical properties. It becomes more stretchy, softer, and after prolonged exposure to water, its strength may be reduced by as much as 20 %.