A：
If you purchase from our company and the purity is found to be below 99%, we will compensate you for the testing costs and provide after-sales service for the purchased product.
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Our products all have a purity of ≥99%.
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After receiving the goods, if the test results are substandard or the package is unopened, after-sales service is available.
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Normally, it takes 5-7 days to receive the product