1.Standard lead equivalent :0.25mmpb, 0.5mmpb or as your request 2.Function: It is application to the protection from X-ray 3.Size:if you need other size please tell me and my company can produce you need size.We are the manufacturer of radiation protection (lead) products. Our products include lead sheets, lead glass, lead bricks, lead shutters, lead screens,lead aprons, lead screen, etc.We can provide customized services if necessary. Lead is used in the construction of medical imaging rooms, X-ray applications, high-energy beams, and nuclear medicine shielding applications. Our own 99.994% pure lead, we can assure proper shielding for new or retrofitting applications.