1, how long is the certificate valid for? - The certificate has no expiration date
2, how often is the Follow-up factory inspection taken place? - The follow-up factory inspection is usually taken place 1 time each year after initial factory inspection.
3, how often will test samples be tested? - 1 Time each year, test samples will be random selected and be tested for requlification of the product.
4, do long does it take from application to receive the certificate? - It usually takes 3 to 6 months