Resistenzklassen der Holzarten

RESISTANCE CLASSES

Wood is a biological material. Its natural resistance against wood-destroying fungi is influenced by various factors. Based on the currently available information, EN 350 provides a guideline for the durability of heartwood of selected wood species against fungal decay.

Resistance Class	Commercial Name	Density kg/m³	Origin
1	Accoya	510	Europe
	IPE	1060	Latin America
	Kebony	640	Europe
	Teak	680	South/East Asia
	Thermo Ash	650	Europe
	Thermo Spruce	300	Europe
1 to 2	Black Locust	740	Europe
1 to 2	Bamboo	1000-1200	Africa, Asia
2	Bangkirai	1000	South/East Asia
	Oak	710	Europe
	Megawood	1200	Europe
	Thermo Pine	350	Europe
3	Siberian Larch	700	Russia
3 to 4	Douglas Fir	510	Europe
	Pine	520	Europe
	Larch	550	Europe
5	African Ayous	390	West Africa

General Principles of Performance Classification

The durability tests enable a performance classification against "reference materials" that have been tested in the same manner. The results do not provide an absolute value of the service life, but they allow for the categorization of the performance of different woods and wood products for a given testing field and a specified intended use class.

Resistance Class	Definition
1	very durable
2	durable
3	moderately durable
4	less durable
5	not durable

Prerequisite for a long lifespan is proper installation. Wood-specific changes due to weathering, such as the greying process, blue stain formation, or the development of stress and surface cracks, do not affect the lifespan. The resistance classes describe or classify the inherent durability of wood against wood-degrading fungi, insects, termites, or other wood pests. The resistance classes (also known as durability classes) are scaled from 1 (very durable) to 5 (not durable).

Resistance Classes

Resistance Class	Commercial Name	Density kg/m³	Origin
1	Accoya	510	Europe
	IPE	1060	Latin America
	Kebony	640	Europe
	Teak	680	South/East Asia
	Thermo Ash	650	Europe
	Thermo Spruce	300	Europe
1 to 2	Black Locust	740	Europe
1 to 2	Bamboo	1000-1200	Africa, Asia
2	Bangkirai	1000	South/East Asia
	Oak	710	Europe
	Megawood	1200	Europe
	Thermo Pine	350	Europe
3	Siberian Larch	700	Russia
3 to 4	Douglas Fir	510	Europe
	Pine	520	Europe
	Larch	550	Europe
5	African Ayous	390	West Africa

General Principles of Performance Classification

Resistance Class	Definition
1	very durable
2	durable
3	moderately durable
4	less durable
5	not durable

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