GSP Strength Tests Independent strength tests have been performed by Mar n Joergensen which can be seen at h p://globalflyfisher.com/ e‐ be er/fly‐tying‐thread‐table. Nano Silk comes out strongest comparisons against comparable threads. The big ques on is why is Nano Silk so strong? It is actually simple, GSP threads are made from extruding polythene (Gel Spun Polyethylene GSP) in the same way spaghe is made. The raw plas c is stretched over rollers un l the required diameter and merged into the final thread. Depending on the manufacturer it may then be twisted. With spaghe you get different quality according to the flour used. True ‘00’ flour is used for the best quality spaghe . In the same way Semperfli specifica ons demand the highest quality polyethylene with specific quali es which make the best and strongest quality fly tying thread. As a result our technical team have produced aramids (GSP) where the molecules tend to form rod‐like structures and these are only be oriented in one direc on to form a strong fiber for fly tyers. Aught

Denier

Dia (mm)

Test (grams)

GSP

18/0

30

0.019

652

Nano Silk Ultra Fine 30D 18/0

GSP

18/0

30

0.025

1140

Super/Ultra Strong

GSP

10/0

50

0.033

1077

Roman Moser

Power Silk 10/0 (fine) Dyneema Thread

GSP

8/0

55

0.033

1077

UNI

UNI‐Cord

GSP

12/0

50

0.023

1811

Wapsi

GSP 50

GSP

50

0.02

1815

Semperfli

Nano Silk 50D 12/0

GSP

12/0

50

0.038

1900

70 to 100 Denier UNI

UNI‐Cord

GSP

8/0

75

0.036

1928

Gudebrod

GX1

GSP

70

0.025

2523

Wapsi

GSP 75

GSP

75

UNI

UNI‐Cord

GSP

Wapsi

GSP 100

GSP

Semperfli

Nano Silk Predator 100D 6/0

GSP

Roman Moser

Power Silk 5/0 (medium) Dyneema

GSP

Wapsi

GSP 130

RST

Brand

Product

Material

Veevus

G20 30D

Semperfli 50 Denier Threads Benecchi

30 Denier

7/0

2720

100

0.036

3622

100

0.03

3630

6/0

100

0.041

3800

6/0

115

0.033

2041

GSP

130

0.051

2950

Dynacord (Dynema)

GSP

150

0.135

3430

Veevus

G20 150D

GSP

150

0.042

3742

Veevus

G20 200D

GSP

200

0.05

UNI

Kevlar

Kevlar

Wapsi

GSP 200

GSP

Semperfli

Nano Silk Big Game 200D 3/0

GSP

150 Denier & Above

Page 160

3/0

3/0

200

3798

200

7250

200

0.062

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