Kraig Biocraft Laboratories Inc (KBLB)

[Eskaminagaga]

no one has ever seen the specs on their material.

Last week, one of their patent applications hit the public record (Pub. #: US2016/0222174A1) and it lists some of the properties of their silk fibers. I will compare their best properties listed on their patent application to the properties of the prototype MonsterSilk fiber "Spider-6 GFP (line 4)" listed in the PNAS (HERE):

Breaking Stress (MPa):
KBLB: 336.3 ±87.3
Bolt: 310

Strain (%):
KBLB: 31.1 ±4.5
Bolt: 200

Toughness (MJ/m^3):
KBLB: 77.2 ±29.5
Bolt: 59.2

Young's Modulus (Mpa):
KBLB: 5498.1 ±1181.2
Bolt: 5820

So, based on this, Bolt Thread's best silk thread has comparable strength, is not quite as tough, and is much stretchier assuming it alone had all of the best properties listed in the patent as the MonsterSilk prototype fiber "Spider-6 GFP (line 4)" which Kim had mentioned had been improved upon since those results were published. It doesn't come close to the 2,000 MPa strength claimed of Dragon Silk. I would not be surprised if their properties have also been improved, but I personally doubt they have made it to Dragon Silk's level.

Now, Bolt's properties are pretty good properties to be used in standard clothing just as MonsterSilk would be, but they are not to the level that is needed to be put in protective textiles which is why they haven't even been trying to go that route.