What term is used for a form of casket interior created by placing the lining material on a metal form and applying steam?

The term that describes a form of casket interior created by placing the lining material on a metal form and applying steam is known as a crushed interior. This process involves heating the fabric, causing it to conform to the shape of the metal form and creating a textured appearance that is both visually appealing and softly padded. The steaming allows for the material to be manipulated easily and achieve the desired effect, leading to the characteristic crinkled or "crushed" look that defines this interior type.

The other terms, though related to casket interiors, refer to different methods or designs. Upholstered interior typically involves a more padded effect achieved without the specific steam process. Mattress interior denotes a style that mimics traditional bedding layouts, and layered interior implies a design constructed with multiple layers, which does not align with the steaming method described in the question. Understanding these distinctions helps in recognizing the specific techniques and aesthetics associated with casket manufacturing.