Resysta Material in comparison

Material properties

cracking

swelling

splintering

rotting

insect infestation

waterproof

slip-resistant

Softwood

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Teak

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UPM Timber (Pine & Spruce)

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WPC

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Resysta

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Xenon test

Best result after 2000 hours, 15 materials tested

Task

In cooperation with the renowned „eph-Institut“ located in Dresden, Germany – Resysta carried out an „artificial weathering test of selected materials“. The Xenon test was chosen as test procedure.

Test Performance

Artificial weathering was carried out for 2000 h (after 650 MJ/m2 irradiation) with a Xenon tester CI 3000 (test device KL 31) according to DIN EN 11341. Artificial weathering was conducted at the following test conditions:

  • 55°C black standard temperature
  • 50% relative humidity
  • Radiation intensity 0.5 W (m2 x nm) at 340 nm
  • Weathering cycle: spray cycle 18 min, drying phase 102 min

A factor of 15-25 can be applied to this 2000 h test. Assuming factor 20 and an average of 7 sunshine hours per day (Central Europe) this corresponds to a weathering period of 15 years.

The following assessments were carried out to characterize the weathering resistance:

  • visual evaluation of color change by means of gray scale according to DIN EN 20105-A02
  • visual evaluation after 500 h, 1000 h, 1500 h and 2000 h.

 

Test Material

eph-Institut“ was provided with 15 material samples with two test specimen each.
One specimen of each version was subject to the weathering test.

Test Results / Details

Test Results at Artificial Weathering

Visual evaluation

MATERIAL VISUAL EVALUATION AFTER 2000h
Siberian Larch completely bleached surface, brittle, major structural differences early wood / late wood
Thermo Ash Tree completely bleached surface, brittle and cracked surface
IPE completely bleached surface
Redwood completely bleached surface, major structural differences early wood / late wood
Bangkirai brittle and cracked surface
Accoya Silver Patina patchy graying
Werzalit Terrazza brown rough surface, loss of gloss, several white particles individually visible
Mega Wood clearly visible change in color (bleaching)
WPC USA very severe change in color (bleaching), rough surface, loss of gloss, several white particles
individually visible
WPC USA XLM severely grayed surface
WPC USA Twin Finish clearly visible change in color (bleaching), brittle and cracked surface, several white particles individually visible
UPM – gray severe change in color (bleaching), rough surface
Rehau – Relazzo very severe change in color (bleaching), several white particles individually visible
Resysta + Glaze (Walnut) very slight change in color, individual white particles visible
Resysta + Glaze (Walnut) + 2K visible change in color, individual white particles visible

Recording of color change using gray scale gradation

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MATERIAL after 500h after 1000h after 1500h after 2000h
Siberian Larch 1 1 1 1
Thermo Ash Tree 1 1 1 1
IPE 1 1 1 1
Redwood 1 1 1 1
Bangkirai 1 1 1 1
Accoya Silver Patina 2.5 2 1.5 1.5
Werzalit Terrazza brown 3 3.5 3 3
Mega Wood 4.5 3.5 3.5 3
WPC USA 1.5 1 1 1
WPC USA XLM 4 3 2.5 2
WPC USA Twin Finish 4 3 2.5 2.5
UPM – gray 4 3 2 1
Rehau – Relazzo 3 2.5 2.5 2
Resysta + Glaze (Walnut) 4.5 4 4 4
Resysta + Glaze (Walnut) + 2K 5 4.5 4.5 3.5

Rating scale for the assessment of color change by using the gray scale:

gray scale gradation 5: no visible change in color
gray scale gradation 4,5: very minor change in color
gray scale gradation 4: minor change in color
gray scale gradation 3,5: visible change in color
gray scale gradation 3: clearly visible change in color
gray scale gradation 2,5: very clearly visible change in color
gray scale gradation 2: severe change in color
gray scale gradation 1: very severe change in color

 

Sibirian Larch

IPE / TEAK

Bangkirai

UPM – gray

WPC USA

Resysta + Glaze (Walnut) + 2K

Concluding Remark

With all products exposed to weathering, changes of the surface appearance
is taking place. Mechanical changes like swelling or shrinkage could not be demonstrated in this test.

It is clearly apparent that all wood specimen show distinct changes in color already after a short period of time. A similar effect – in milder form – can be observed with WPC materials.

Besides, these feature the obvious plastic appearance.

Conclusion

Of all tested materials, Resysta most convincingly combines the look and feel of wood with longevity.

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