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This European Standard defines the characteristics of solid softwood floor boards with tongue and groove for internal use as flooring. This standard contains specifications about dimensions, grading and delivery of floor boards. Grading specifications are given for the following wood species: Norway spruce (Picea abies), Silver fir (Abies alba), Sitka spruce (Picea sitchensis), Scots pine (Pinus sylvestris), European larch (Larix decidua), Douglas fir (Pseudotsuga menziesii). For species not mentioned the limits of features as listed in Table 3 should be stated. Products specified in this standard are manufactured from a natural untreated softwood or prefinished with a coating. This standard gives no information about the coating itself.