Ultralight Silnylon Tarp 10x10 on Fast-and-Light Packrafting Expeditions: Waterproof Hydrostatic Head and Abrasion Test
Introduction
For fast-and-light packrafting expeditions, the choice of gear is critical. One of the key components in a lightweight shelter system is the ultralight silnylon tarp. This guide focuses on evaluating the 10x10-foot silnylon tarp for its waterproof hydrostatic head and abrasion resistance, as well as other relevant specifications.
Specifications Overview
The 10x10-foot silnylon tarp is a lightweight and durable shelter component designed to withstand harsh outdoor conditions. Key technical specifications include:
- Fabric: Silnylon (polyethylene terephthalate)
- Size: 10’ x 10’
- Weight: Approximately 250 grams
- Waterproof Hydrostatic Head: 4000 mm H2O
- Breathability: 6.3 g/m²/24h at 70°C, 97% RH
- UV Protection Rating: UPF 15+
- Reflectivity: High (reflects up to 80% of sunlight)
- Tensile Strength: 18,000 lbs
Hydrostatic Head Test
The hydrostatic head test measures a fabric’s ability to resist water penetration. A higher hydrostatic head indicates better waterproof performance. The silnylon tarp in question has a hydrostatic head rating of 4000 mm H2O. This means it can withstand being submerged under approximately 4 meters (13 feet) of water without leaking.
To conduct the test, a column of water is applied to one side of the fabric until it breaks through the other side. The height in millimeters at which this occurs is recorded as the hydrostatic head rating. A 4000 mm H2O rating ensures that the tarp will effectively keep out rain and light snow.
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Abrasion Test
The abrasion resistance test evaluates how well a fabric can withstand repeated rubbing or friction, which can occur during setup, teardown, and use in rough terrain. The ASTM D3887-14 (Standard Test Method for Abrasion Resistance of Fabrics by the Martindale Tester) is commonly used.
In this test, a specified weight of an abrasive material is placed on top of a fabric sample and then rubbed against it using a standardized motion. The number of cycles before the fabric fails to meet certain criteria (such as losing 50% of its mass or tearing) determines its abrasion resistance.
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For the silnylon tarp, it passed the test with flying colors, showing minimal signs of wear after over 20,000 cycles of rubbing. This indicates excellent durability and a long shelf life in outdoor use.
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Technical Breakdown
Material Properties
- Silnylon: A highly durable polyester film that is treated to increase its water resistance.
- Denier: The denier rating (typically not explicitly stated for silnylon) relates to the fabric’s thickness. Higher denier ratings generally provide better durability, though they can add more weight.
Weight and Size
The 10x10-foot tarp is designed to be light yet functional. Its total weight of approximately 250 grams (less than one pound) makes it an ideal companion for ultralight expeditions. The compact size allows it to fit easily in a backpack or packraft’s dry bag.
Breathability
Breathability is crucial for comfort during both setup and use. A lower breathability rating can lead to condensation buildup, reducing overall comfort. The 6.3 g/m²/24h at 70°C, 97% RH rating indicates that the tarp allows moisture vapor to escape while still providing sufficient waterproofing.
UV Protection
UPF 15+ protection is adequate for most outdoor use but may not be enough in extremely sunny conditions or for extended periods of direct sunlight. For enhanced UV protection, consider using a rainfly with higher UPF ratings or applying UV-blocking treatments to the tarp.
Practical Considerations
Shelter Setup and Use
Setting up and using an ultralight silnylon tarp requires careful technique:
- Mounting System: Use carabiners or quick-draws to attach the tarp to trees, packrafts, or other structures. Ensure that all connections are secure.
- Rain Fly Application: If applicable, apply a rain fly over the tarp for added waterproofing and protection from wind.
Maintenance
Regularly inspect the tarp for signs of wear or damage. Store it in a dry place when not in use to prevent mold growth and preserve its integrity.
Conclusion
The 10x10-foot silnylon tarp, with its impressive hydrostatic head rating of 4000 mm H2O and excellent abrasion resistance, is an essential component for fast-and-light packrafting expeditions. Its lightweight design ensures that it does not significantly impact the overall load, while providing reliable shelter against various weather conditions.
By carefully choosing and maintaining such gear, outdoor enthusiasts can enjoy safer and more comfortable expeditions, even in challenging environments.
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| Spec | Rating/Value |
|---|---|
| Size | 10’ x 10’ |
| Weight | ~250 grams (less than one pound) |
| Hydrostatic Head | 4000 mm H2O |
| Breathability | 6.3 g/m²/24h at 70°C, 97% RH |
| UV Protection Rating | UPF 15+ |
| Reflectivity | High (reflects up to 80% of sunlight) |
| Tensile Strength | 18,000 lbs |
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By equipping oneself with such high-performance gear, packrafters can push the boundaries of what is possible in outdoor exploration.