Graco Inc. Indy-X Chop Manuel D’Utilisation

MEKP is among the more hazardous materials 

      found in commercial channels. Proper handling 
      of the “unstable (reactive)” chemicals presents a 

      definite challenge to the plastics industry. The 

      highly reactive property which makes MEKP 
      valuable to the plastics industry in producing the 
      curing reaction of polyester resins and gel-coats
      also produces the hazards which require great care
      and caution in its storage, transportation, handling,
      processing and disposal.

     

Workers must be thoroughly informed of the hazards

      that may result from improper handling of MEKP,
      especially in regards to contamination and heat. 
      They must be thoroughly instructed regarding the

      proper action to be taken in the storage, use and

      disposal of MEKP and other hazardous materials
      used in the laminating operation.

    

 GlasCraft recommends that you consult OSHA 

  Sections   1910.94, 1910.106, 1910.107 and NFPA 

  No. 33, Chapter 16,17, and NFPA No. 91 for further

   Spraying materials containing polyester resin and 
gel-coats creates potentially harmful mist, vapors and 

atomized particulates. Prevent inhalation by providing 

sufficient ventilation and the use of respirators in the 

work area.

   Read the material manufacturer’s warnings and ma-

terial MSDS to know specific hazards and precautions 
related to polyester resins and gel-coats.
   To prevent contact with polyester resins and gel-
coats, appropriate personal protective equipment, 
including chemically impermeable gloves, boots, 
aprons and goggles are required for everyone in the 

work area.

Isocyanites (ISO) are catalysts used in two component 
foam and polyurea coatings. ISO will react with moisture 
(such as humidity) to form small, hard, abrasive crystals, 
which become suspended in the fluid. Eventually a film 
will form on the surface and the ISO will begin to gel, 
increasing in viscosity. If used, this partially cured ISO 
will reduce performance and the life of all wetted parts.

To prevent exposing ISO to moisture:

Always use a sealed container with a desiccant 
dryer in the vent, or a nitrogen atmosphere. 

Never 

store ISO in an open container.

Keep the ISO lube pump reservoir (if installed) filled 
with Graco Throat Seal Liquid (TSL), Part 206995. 
The lubricant creates a barrier between the ISO and 
the atmosphere.

Use moisture-proof hoses specifically designed for 
ISO, such as those supplied with your system.

Never use reclaimed solvents, which may contain 
moisture. Always keep solvent containers closed 
when not in use.

Never use solvent on one side if it has been contam-
inated from the other side.

Always lubricate threaded parts with ISO pump oil 
or grease when reassembling.

Some foam blowing agents will froth at temperatures 
above 90°F (33°C) when not under pressure, especially 
if agitated. To reduce frothing, minimize preheating in a 
circulation system.

Spraying materials containing isocyanates creates 
potentially harmful mists, vapors, and atomized partic-
ulates.

Read material manufacturer’s warnings and material 
MSDS to know specific hazards and precautions 
related to isocyanates.

Prevent inhalation of isocyanate mists, vapors, and 
atomized particulates by providing sufficient ventila-
tion in the work area. If sufficient ventilation is not 
available, a supplied-air respirator is required for 
everyone in the work area.

To prevent contact with isocyanates, appropriate per-
sonal protective equipment, including chemically 
impermeable gloves, boots, aprons, and goggles, is 
also required for everyone in the work area.

Some materials may become self-igniting if applied 
too thickly. Read material manufacturer’s warnings 
and material MSDS.

The amount of film formation and rate of crystalli-
zation varies depending on the blend of ISO, the 
humidity, and the temperature.

To prevent cross-contamination of the equipment’s 
wetted parts, 

never interchange component A (isocy-

anate) and component B (resin) parts. 

   Contaminated MEKP can become explosive. 

Prevent contamination of MEKP with other materi-
als, which includes, but is not limited to polyester 
overspray, polymerization accelerators and promot-

ers, and non-stainless metals. Even small amounts 

of contaminates can make MEKP explosive. This re-
action may start slowly, and gradually build-up heat, 

which can accelerate until fire or an explosion result. 

This process can take from seconds to days. 

   Heat applied to MEKP, or heat build-up from con-
tamination reactions can cause it to reach what is 

called its Self-Accelerating Decompisition Tempera-

ture (SADT), which can cause fire or explosion.
   Spills should be promptly removed, so no residues 
remain. Spillage can heat up to the point of self-

ignition. Dispose in accordance with manufacture’s 
recommendation.

   Store MEKP in a cool, dry and well-ventilated area 
in  the  original  containers  away  from  direct  sunlight 

and away from other chemicals. It is strongly recom-
mended that the storage temperature remain below 

86° F (30° C). Heat will increase the potential for ex-

plosive decomposition. Refer to NFPA 432.

Keep MEKP away from heat, sparks and open

flames.

   Remove all accumulations of overspray, FRP sand-

ings, etc. from the building as they occur.  If this waste 

is allowed to build up, spillage of catalyst is more likely 

to start a fire. 

   If cleaning solvents are required, read material 

manufacture’s warnings and material MSDS to know 

specific hazards and precautions. (GlasCraft recom-

mends that clean-up solvents be nonflammable.)

      Current  catalysts  are  premixed  and  do  not  require 
any diluents. GlasCraft strongly recommends that dilu-

ents not be used. Diluants add to the possibility of con-
taminates  entering  the  catalyst  system.  Never  dilute 

MEKP with acetone or any solvent since this can pro-

duce  an  extremely  shock-sensitive  compound  which 
can explode.

   Use only original equipment or equivalent parts

from GlasCraft in the catalyst system (i.e.: hoses, fit-
tings,  etc.)  because  a  hazardous  chemical  reaction 

may result between substituted parts and MEKP.

  To prevent contact with MEKP, appropriate personal 
protective equipment, including chemically imperme-
able gloves, boots, aprons and goggles are required 

for everyone in the work area.