I don't recall ever seeing a PE# but once I see the lb rating that's it. I'll look for it next time I'm at LeBarons. Thanks for the great info on lines.
GREAT ARTICLE:
Line Technology 『The Difference in Line Strength Is a Matter of Weightã€
â– The Deceptiveness of Line Labelings
What do you look for most when choosing a fishing line? While there are a wide range of choices available to suit the type of fishing and individual preferences, a slender, yet strong line is all in all the best choice for any situation. If the question of material strength is left aside, it goes without saying that a thinner line is more advantageous for fishing. Amongst the teeming competition of today's field, superiority of line quality can have a big effect on your catch. For the Japanese, with their penchant for sensitivity in fishing, insistence on "thinness" is a must.
However, here lies a major pitfall. Does all line with a thickness index of 1 have the same diameter, regardless of the product? Are they the same even when made from different materials? Bringing in a big fish on thin line is the angler's badge of honor, but can the thickness index really help you make the best choice? Is your line providing you with a catch you can be proud of?
â– Different Diameters for the Same Thickness Index?
There are prescribed "standard diameters" for nylon line. For example, 0.165mm for thickness Index 1 -- no more, no less. However, slight fluctuations and a certain margin of error inevitably occur in the production process, so if a line is thinner than the standard diameter of the next thickness index number up, it can be be labeled as Index 1. This gives for a situation where "precisely Index 1" and "Index 1 verging on Index 1.5" are labeled together on the market. Moreover, for thinner lines requiring advanced manufacturing technology, the diameter becomes more and more difficult to control.
Yet even though a minimal standard exists for nylon lines, things become even more confusing when we consider the labelings for fluorocarbon and polyethylene (Dyneema) lines, which merely "borrow" the nylon standard diameters. Especially in the case of polyethylene (PE) line, the market is flooded with obviously thick products, but when you considers the higher costs involved with thinner raw line, the possibility of customers being deceived by thicker raw line used to keep costs down and improve strength (tensile strength: measured by cutting a portion of line at random and pulling on both ends) can not be ruled out. This is why a simple comparison of strength between two lines can not be made even though they may be labeled with the same thickness index.
â—A Word on Pound Notation
Recently line labeled with pound (lb) notation is becoming more and more common. The pounds in this case indicate linear strength. This method of notation is based on neither thickness nor weight, and hence cannot be converted into a thickness index number. In order for even a rough conversion to be possible, the "weight" of the line must also be known.
Furthermore, for 12lb line we can calculate the linear strength to be 5.436kg (1lb = 0.453kg,) but one needs to be careful as this means that the line "must break" at 5.436kg. If the line has a linear strength less than 5.436kg, then there is no problem labeling it as 12lb; but for example, if the line has a linear strength of 6kg then it must be labeled as 13.3lb. In general, the actual linear strength has to be less than the pound notation. The reasoning for this has its roots in big-game fishing, which aims to "bring in the biggest fish possible on the weakest line."
As for methods of labeling fishing line world-wide, the United States uses pound notation. Europe uses a combined notation of line diameter (mm) and linear strength (kg.) In Japan, Korea and Taiwan, the thickness index used to indicate line diameter is most common, but the use of pound notation is on the rise. As just mentioned, pound notation implies that the line will break at a lower value than the labeling, but in the case of kilogram notation, the labeling represents an average value of linear strength. Many American products using pound notation are actually stronger than their labelings indicate, with one extreme example being line with linear strength of 16lb being sold as 8lb line. There are also European products which are actually stronger or thinner than their labelings indicate. Also, amongst Japan, Korea and Taiwan, only Japan has prescribed standard diameters for the thickness index for nylon line, while no standards exist for fluorocarbon and PE lines, making for an unreliable labeling situation. Currently, attempts are underway to improve the situation, such as the European Fishing Tackle Trade Association which is defining standards and awarding certification to products meeting the new specifications.
â– The Key to Making High-precision Line
In old Japan, the measurement of line thickness was made in terms of the traditional Japanese shakkan-ho^ units of weight: "fun," "rin," and "mo^." In 1959, these units served as the basis for the establishment of standard line diameters and the thickness index, but nowadays the notion of weight seems to have almost entirely escaped from memory. However, this forgotten notion of line weight is the key in our pursuit of high-precision line manufacturing.
Currently, the decitex (dtex) is the unit of measure for line weight. (However, the former denier unit is still often found in use. 1 denier equals 1g per 9000m.) Weight of 1g per length 10,000m of line is defined as 1dtex, and thickness Index 1 nylon line has a value of 245dtex -- or for 100m of Index 1 line, a weight of 2.45g. If the length and weight are known, the the line's average diameter can naturally also be calculated, but as an example, if the line's weight is greater than 2.45g, then we know that it is thicker than the standard diameter. Also, the denier value becomes necessary to calculate a line's "tensile strength." When the line's linear strength value is divided by the denier value, we obtain a value representing the line's true material strength, regardless of thickness.
â– Comparison of Strength per Uniform Cross-sectional Area
(Standard Diameter ?0.165mm for Nylon Index 1)
The function of line in fishing is obvious: to serve as a direct link to pull in the fish. In light of this function, a stronger line can be made thinner, so in choosing a line, strength becomes the first point of consideration. But what should one look for when trying to choose the strongest line? Line developed from materials such as fluorocarbon, nylon and Dyneema with a wide range of characteristics are available in tackle shops. For example, nylon is popular as an easy-to-use all-around line; fluorocarbon is popular as a leader; and Dyneema is a common choice for the main line. However, given the vague relationship between line diameter and index numbers under the current labelings, index numbers are not enough to make for a uniform comparison of line strength. If there is a margin of error between index notations -- in other words, a margin of error in thickness -- some other standard for line strength becomes necessary in order to make a good decision.
Let us then examine a comparison of line strength per cross-sectional area for each material. If we derive the line strengths for samples with uniform cross-sectional area, then we can compare the true strength of each line regardless of thickness or index number. Comparison of strength with uniform cross-sectional area is the key to understanding the strength inherent to each product.
In order to obtain the cross-sectional area, we will use the decitex and denier values mentioned earlier. The cross-sectional area can be derived by the formula {π × radius × radius}. (π ? 3.14) The line's diameter can be calculated from its precise weight and the specific gravity of the material, namely: {√(denier value ÷ (specific gravity × 9000m × π)) × 2} or {√(decitex value ÷ (specific gravity × 10000m × π)) × 2}. Taking Index 1 line as an example, nylon line has a specific gravity of 1.14; fluorocarbon has a specific gravity of 1.78. Furthermore, nylon has a denier value of 219, or 243dtex, while fluorocarbon has a denier value of 342, or 380dtex. If we take Index 1 line at its standard diameter of 0.165mm, using the above formula we derive a cross-sectional area of 0.0213716mm2. Actual measurements of our products show nylon with a denier value of 219 and strength of 2.2kg, fluorocarbon with a denier value of 342 and strength of 2.052kg. Using the formula {kg × f ÷ mm2} for strength per square-millimeter, we obtain 102.9kg/mm2 for nylon and 96kg/mm2 for fluorocarbon. Since these figures represent strength in terms of square-millimeters, it becomes evident that nylon is essentially the stronger material. For reference, performing the calculations in deniers gives 10.04g/denier for nylon and 6.00g/denier for fluorocarbon. Actual fishing conditions like immersion in water and exposure to sunlight are also a factor, so choosing a fishing line of course isn't all math. But knowing the strengths of the materials you use can bring a new sense of enjoyment to your fishing.