All About PU Coatings and Tent Durability

All About PU Coatings and Tent Durability

Blog Article

PU Coatings and Tent Durability: A Summary Overview

PU coatings are the most popular means of waterproofing tent fabric. Polyurethane is applied in a thin coat to the under side of the tent material in manufacture. All About PU Coatings and Tent Durability ,PU coating gives the fabric a water barrier, with a hydrostatic head (HH) rating given in millimeters (e.g., PU2000mm equals resistance to 2000mm column of water).

Advantages of PU Coatings:

Waterproofness: PU coatings provide an excellent rain and moisture barrier.
Affordability: Typically less expensive than silicone coatings.
Breathability: PU coatings are more breathable than some other waterproof coatings such as PVC.
Seam Taping: PU is a surface that supports heat-sealed seam tape, essential for the protection of stitched areas from leaks.
Printability: Logos and brand names can be printed directly onto PU coatings.
Effect on Tent Durability:

Whereas PU coatings offer primary waterproofing, they can also affect the overall tent durability in a variety of ways:

Decreased Tear Strength: Certain sources state that PU coatings will decrease the tear strength of a fabric by a considerable amount (as much as 75%). This is due to the fact that the coating will concentrate stress points on the fabric.
Hydrolysis: PU finishes can undergo hydrolysis, chemical degradation due to exposure to moisture and humidity. Hydrolysis leads to sticky, flaking, or delamination of the coating over time, considerably diminishing the waterproofing and shelf life of the tent. Elevated temperatures and higher humidity speeds up hydrolysis.
UV Degradation: Extended exposure to ultraviolet (UV) light will cause the chemical bonds in PU coatings to deteriorate, resulting in loss of water resistance and loss of strength of the fabric over time.
Wear and Tear: Frequent use, particularly repeated folding and rubbing, will wear off the PU coating, diminishing its efficiency. Dirt, oils, and chemical exposure also cause degradation.
Lifespan: The PU coating of a tent will last about 2 years under general usage and storage. Poor storage, particularly under closely packed circumstances or wet situations, will drastically shorten its lifespan through off-gassing and delamination of PU.
Comparison with Silicone Coatings:

Silicone coatings (commonly placed on nylon material, making "silnylon") present another option with alternative durability features:

Strength: Silicone coatings permeate the nylon fabric, creating a stronger, reinforced, and more tear-resistant fabric.
UV Resistance: Silicone offers better UV resistance than PU, helping to prolong the life of the fabric.
Water Repellency: Silicone repels water effectively, causing it to bead and roll off, and it dries quickly.
Lifespan: Silicone coatings tend to be more resilient and last longer with their waterproof property than PU.
Seam Sealing: Silicone-coated materials are difficult to tape and must be manually applied with liquid seam sealants.
Breathability: Silicone coatings will decrease breathability in relation to PU.
Some tent makers employ a blend of silicone on the outside for durability and water resistance, and PU on the inside to permit seam taping and possibly improved breathability.

Caring for PU Coated Tents for Longevity:

Careful maintenance and storage are essential to achieve the longest possible lifespan of a PU-coated tent:

Keep it Clean: Remove loose dirt and debris regularly with a soft brush or damp cloth. Wash dirty spots with a mild soap solution and rinse well with lukewarm water.
Dry Thoroughly: Store the tent only when it is dry to avoid mold, mildew, and hydrolysis. Dry the tent out for at least a few hours after every use.
Store Loosely: Do not tightly roll or pack the tent for extended periods. Store it loosely in a cool, dry, and well-ventilated area, out of direct sunlight. Attics, garages, and basements are not ideal unless they are well-insulated and ventilated. Use condensation removers in the storage area, if possible.
Avoid Harsh Chemicals: Never use bleach, solvents, or abrasive cleaners, as they can harm the PU coating.
Treat Sticky Coatings: In case the PU coating is sticky or delaminating, attempt to revive it by washing the affected parts by hand to strip off the old coating and subsequently applying a fresh coat of PU coating spray (e.g., Nikwax). Talcum powder may be used to absorb residue upon washing.
Re-waterproof: As time passes, the water resistance of the outer fabric may fade. Reapply a suitable waterproofing treatment to revive it.
Repair Seams: Inspect seam seals on a regular basis and re-seal them using a suitable sealant (PU coating specific) if needed.

PU coatings are a common and mostly effective means of waterproofing tents, with a balance between price and performance. Their lifespan, though, depends on conditions such as exposure to UV light, wear and tear, and especially hydrolysis. Proper care and storage can help a PU-coated tent last longer. When selecting a tent, look at the trade-offs between silicone and PU coatings in relation to your own requirements and conditions you anticipate facing.