David Gauntlett
Senior Member
O.K....I have now googled this....which is what I perhaps should have done in the first place, rather than hassle you guys
There is absolutely loads of info out there, although I might add that what I waded through before my eyes went wonky was all anecdotal stuff in forums such as ours...although some was on trecking or forces type forums which seemed pretty authoritative.
The consensus was...
(a) You absolutely MUST wash youre Goretex garments regularly.
(b) Washing machines with all visible detergent removed are fine.
(c) You must NOT use detergents.
(d) Nikwax or similar cleaning products (Tech Wash) are good...soap is OK.
(e) Nikwax or similar WASH-IN reproofing products were not as good as their SPRAY-ON reproofers, because they can block the pores of the inner Goretex membrane.
Update to note (e) above
Since writing the above notes derived from the internet, I have had a long chat with the owner of an angling and outdoor sports shop which sells large amounts of Goretex, non Goretex, and waxed cotton garments to suit most outdoor activities. During the many years he has been making his living in this way, he has necessarily discussed with the manufacturers the various proofing products available....and which of those they recommend for their products (which naturally includes those used in the manufacturing process) He entirely agrees with the points in my notes above, with the exception of (e), which he states is certainly not true.
On the other hand, one of the big online stores who repair and reproof Goretex clothing themselves DO recommend the use of the SPRAY-ON version of the product they use (Graingers, which is similar to Nikwax), rather than the WASH-IN, for Goretex or similar garments!!!
So...the jury is still out. However, the information provided by my friend is good enough for me, so I shall now try the WASH-IN Nikwax TX Direct....with my fingers firmly crossed....
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It would seem that the Goretex membrane is laminated onto the inside of the garment's outer fabric. The Goretex membrane has many tiny pores, which allow sweat to escape outwards...but will not let the larger water molecules seep in. Hence it's great waterproof and breathable nature. In time these pores can become blocked with dirt, and obviously thus render the membrane non breathable. Washing will cure this problem.
The outer fabric is treated with a breathable proofing agent, which is what causes the water to 'bead' and run off of the outer surface. Again, this proofing is rendered ineffective once too much dirt has stuck to it, and the outer fabric can 'soak out'. Once this happens, the whole garment is once again robbed of it's 'breathability', although the inner Goretex membrane will still not allow this water through to the body.
Its seems that once the breathability is destroyed by either method, the humidity inside the garment condenses on the inside of the Goretex layer (because it can no longer escape). The wetness caused by this condensation can apparently be quite considerable, and give the false impression that the garment has broken down and started to leak...when in fact if it were washed, thus restoring the breathability (and the outer reproofed if required) the garment would be as good as new
Assuming all this to be true, I do hope that not too many folk dumped a perfectly good Goretex, wrongly assuming that the thing was knackered
Anyway, once I have the required, I am going to wash my gear in my machine, using Tech Wash (having removed all possible detergent, and run the machine empty first)...and see what happens. I will report back, either way
Many thanks for all the replies and help...you are a great bunch of guys.
Cheers, Dave.
There is absolutely loads of info out there, although I might add that what I waded through before my eyes went wonky was all anecdotal stuff in forums such as ours...although some was on trecking or forces type forums which seemed pretty authoritative.
The consensus was...
(a) You absolutely MUST wash youre Goretex garments regularly.
(b) Washing machines with all visible detergent removed are fine.
(c) You must NOT use detergents.
(d) Nikwax or similar cleaning products (Tech Wash) are good...soap is OK.
(e) Nikwax or similar WASH-IN reproofing products were not as good as their SPRAY-ON reproofers, because they can block the pores of the inner Goretex membrane.
Update to note (e) above
Since writing the above notes derived from the internet, I have had a long chat with the owner of an angling and outdoor sports shop which sells large amounts of Goretex, non Goretex, and waxed cotton garments to suit most outdoor activities. During the many years he has been making his living in this way, he has necessarily discussed with the manufacturers the various proofing products available....and which of those they recommend for their products (which naturally includes those used in the manufacturing process) He entirely agrees with the points in my notes above, with the exception of (e), which he states is certainly not true.
On the other hand, one of the big online stores who repair and reproof Goretex clothing themselves DO recommend the use of the SPRAY-ON version of the product they use (Graingers, which is similar to Nikwax), rather than the WASH-IN, for Goretex or similar garments!!!
So...the jury is still out. However, the information provided by my friend is good enough for me, so I shall now try the WASH-IN Nikwax TX Direct....with my fingers firmly crossed....
------------------------------------------------------------------
It would seem that the Goretex membrane is laminated onto the inside of the garment's outer fabric. The Goretex membrane has many tiny pores, which allow sweat to escape outwards...but will not let the larger water molecules seep in. Hence it's great waterproof and breathable nature. In time these pores can become blocked with dirt, and obviously thus render the membrane non breathable. Washing will cure this problem.
The outer fabric is treated with a breathable proofing agent, which is what causes the water to 'bead' and run off of the outer surface. Again, this proofing is rendered ineffective once too much dirt has stuck to it, and the outer fabric can 'soak out'. Once this happens, the whole garment is once again robbed of it's 'breathability', although the inner Goretex membrane will still not allow this water through to the body.
Its seems that once the breathability is destroyed by either method, the humidity inside the garment condenses on the inside of the Goretex layer (because it can no longer escape). The wetness caused by this condensation can apparently be quite considerable, and give the false impression that the garment has broken down and started to leak...when in fact if it were washed, thus restoring the breathability (and the outer reproofed if required) the garment would be as good as new
Assuming all this to be true, I do hope that not too many folk dumped a perfectly good Goretex, wrongly assuming that the thing was knackered
Anyway, once I have the required, I am going to wash my gear in my machine, using Tech Wash (having removed all possible detergent, and run the machine empty first)...and see what happens. I will report back, either way
Many thanks for all the replies and help...you are a great bunch of guys.
Cheers, Dave.
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