Chapter 2
Safety Instructions
DM55 DynaDrum PP V6, Manual No.21-18, Rev.2.19 Page 11
Explosion/ Fire Hazard
1. Never operate this unit in an explosive environment.
2. Use cleaning compounds recommended by ITW Dynatec or your adhesive supplier
only.
3. Flash points of cleaning compounds vary according to their composition, so consult
with your supplier to determine the maximum heating temperatures and safety
precautions.
Choice of Adhesive
Substance(s) being processed (e.g., melted, pumped, applied) by ITW equipment is at
the discretion of the user and beyond ITW Dynatec’s control. Any health effects or other
safety-related concerns arising from the melting of those particular substances (e.g.,
hazardous fumes) is the responsibility of the user to identify and mitigate.
DANGER HARMFUL FUMES
PUR adhesives emit fumes (MDI and TDI) that can be dangerous to anyone exposed to
them. These fumes cannot be detected by the sense of smell. ITW Dynatec strongly
recommends that a power‐vented exhaust hood or system be installed over any PUR
system.
Consult with your adhesive manufacturer for specifics about required ventilation. See
also the Special Considerations for Using Reactive HMPUR Adhesives section in this
chapter.
Because of the nature of PUR adhesives to strongly bond in the presence of moisture,
care must be taken to prevent them from curing inside ITW Dynatec equipment.
If PUR adhesive solidifies in a unit, the unit must be replaced. Always purge old PUR
adhesive from the system per your adhesive manufacturer's instructions and time table.
Special Safety Considerations When Using Reactive HMPUR Adhesives
Reactive hot melt PUR (HMPUR) adhesives are known for superior adhesion to
numerous substrates and their exceptional heat, cold and moisture-resistance qualities.
They are an excellent choice for the difficult-to-bond substrates used in a wide range of
environments. HMPUR adhesives chemically cross-link (i.e., cure or thermal-set) to reach
maximum bond strength, typically over a period of 24 to 48 hours after being exposed to
moisture and/or high temperatures.
The advantages of using HMPURs, however, come with special handling requirements.
The adhesive must remain sealed off from the environment and maintained at low
temperatures until it is dispensed, otherwise there is a risk that the adhesive will cross-
link within the glue application equipment, rendering it impervious to melting when it is re-
heated. Most importantly, when over-heated, many HMPURs release gases that can be
hazardous to humans. Therefore, adequate ventilation must be available to prevent injury
to personnel in the workspace. ITW Dynatec PN 114367 Vent Hood is required.
The following is a list of general operational considerations for the use of HMPURs in ITW
Dynatec equipment. In addition, it is important to contact your adhesive manufacturer to
discuss and verify precautions that must be implemented to prevent damage to
equipment and injury to personnel who are working with their products.
1. Assure the workspace has adequate ventilation.
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