Document Level 3

Examples of specific applications


The Level 3 documents give detailed consideration to specific activities/operations and the use of particular machinery likely to be encountered in a workplace in which HTIW is used or manipulated, with the aim of limiting or controlling exposure to fibrous dust.

At present, eight different documents are planned, covering raw material handling, use of hand tools, saws and sanders, assembly operations, installation and removal operations, die-cutting and warehouse operations.


"Removal" refers to large scale demolition of HTIW and other refractory products from hightemperature industrial process equipment such as furnaces, and also smaller scale removal where control measures such as LEV are not possible. [Download file]

Waste disposal

This document deals with waste occurring in the production and in the processing of raw material into insulation products. [Download file]

Assembly Operations

This document focuses on ways to reduce airborne fibrous dust concentrations when carrying out assembly operations. Assembly operations are defined as small scale operations carried out in industrial facilities away from the final installation site. [Download file]

Maintenance and Repair Operations

This document provides information on potential means of reducing workplace exposure to HTIW (fibrous) dust during maintenance and repair operations in high temperature process installations such as furnaces. The advice provided here is generic. [Download file]

Installation of HTIW products

"Installation" refers to large scale installation of HTIW products into industrial process equipment, for example furnaces. [Download file]

Powered hand tools

Control measures for any finishing functions, including use of powered hand tools, are generally a combination of technological solutions and working practises to eliminate or reduce exposure. Selecting the right combination is very important and measures will only work effectively if they are used properly. [Download file]

Module Manufacturing

Modules are manufactured to specified shapes and designs using a range of different machinery, equipment and techniques. In general, ‘modules’ consist of blanket strips which are pressed together to form blocks and held together with various aids. [Download file]

Partial or total enclosure design for a raw material feeding station

HTIW bulk/wool (and offcuts) and other dusty raw materials are used in various secondary processes, such as forming, where HTIW and ingredients (i.e. binder) are mixed in water to produce shaped parts (boards, pipes etc.). [Download file]


Mechanical saws are high powered machines that can produce high velocity dust emissions when used on dry HTIW materials such as blankets, formed shapes, boards and modules.
[Download file]

Good practice in HTIW materials warehouse

This document describes the measures needed to reduce (as far as is possible) fibrous dust exposure of the workers in a warehouse where HTIW materials are stored.
[Download file]

Work Practices for Die Cutting

Die cutting machines (also known as die stamping machines) can be used on products of varying types, including paper, felt, blanket and board.
[Download file]


Sanders are generally used during finishing operations to re-surface formed shapes and boards.
[Download file]