汉译英，在线等~

我们公司是一家专业企业,有完善的质量管理体系认证。我们有经验的研发、生产和销售为一体的一次性医疗用品、高分子材料、贴橡胶制品已有20年。

Our company has passed the Quality Management System Certification and has over ten years experience specializing in developing, producing and marketing one time medical articles, high molecular material and silion rubber products.

一点小建议

感觉上基本没问题，以下是我自己的改良：
Our company is a professional enterprise which have passed the quality management system authentication, we also have a 20-year experience of R&D,production and sales of instant medical articles,high molecular material and silion rubber products.

We have the experience of R&D,production and sale of one-time medical articles,high molecular material and silion rubber products for the past more than ten years

Our company is a professional enterprise which has passed the authentication under the quality management system_We have R&D experience,production and sale of single use medical products,high molecular materials and silion rubber products for 10 over years.