Once mortar has been mixed with water and has set, it is generally considered safe for various applications. However, there are a few important factors to keep in mind:
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Curing Time: Mortar typically requires a curing period to reach its full strength. This can vary depending on the mix, moisture, and ambient temperatures. It is important to allow the mortar to cure properly before putting it under load or applying stresses.
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Drying Time: Even after it feels dry to the touch, the mortar may still be curing internally. It's usually advisable to wait several days before assuming it's completely cured.
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Health and Safety: When working with mortar or any cement-based products, it's important to use appropriate protective gear (like gloves and masks) as the dust can be harmful if inhaled or if it comes into contact with skin.
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Functionality: Ensure that the mortar has been applied correctly and is suitable for the specific use case (such as bricklaying, tile setting, etc.), as the mix and application method can affect its performance.
In summary, while dry mortar is generally safe, it is crucial to ensure that it has been allowed to cure properly and is used in the correct context. If you have specific concerns about your project, it's best to consult with a professional or refer to product guidelines.