Thank you for sharing your question about the timber for your hallway table.
It's great that you are building a hallway table. Would it be possible for you to post a photo of the yellow ticket of the timber? This will allow us to identify what timber you are referring to. As an alternative, I suggest using the 200 x 50mm 2.4m Durable Mixed Hardwood Sleepers they have no chemical treatment in them and provide long-lasting service. Timbers that are exposed to the weather often have some form of treatment on them. I suggest checking with the store's timber specialist before purchasing the wood.