Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION SUCH AS HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

Procedure

1. SUBTASK 70-36-03-360-001 Moulding Procedure

   1. 
      WARNING
      WHEN YOU USE COMAT 01-076 METHYLETHYLKETONE YOU MUST MAKE SURE THERE IS SUFFICIENT VENTILATION. YOU MUST USE THE CORRECT PROTECTIVE CLOTHING. YOU MUST NOT SMOKE. DO NOT PUT THE SOLVENT NEAR A SOURCE OF HEAT.

      Prepare.

      1. Apply dry abrasive blast (Refer to the SPM TASK 70-12-02-120-501) to mould area by CoMat 05-121 SILICON CARBIDE GRIT or CoMat 05-122 SILICON CARBIDE GRIT or CoMat 05-123 SILICON CARBIDE GRIT or CoMat 05-124 SILICON CARBIDE GRIT.

      2. Wipe blasted surface by CoMat 01-076 METHYL ETHYL KETONE reagent grade using clean unsized cheese cloth.

      3. Dry by air for a minimum of 15 minutes.

   2. Under coating.

      1. Within 30 minutes after cleaning, apply CoMat 07-068 PRIMER to moulding surface with the use of a brush. Thickness to be between 0.0002 to 0.0004 in. (0.005 to 0.010 mm).

      2. Dry by air for 10 to 15 minutes at room temperature.

   3. Moulding.

      1. Preheat the part A at 105 deg to 176 deg F (40 deg to 80 deg C) to reduce viscosity sufficiently to allow for pour and pump.

      2. Remove all the air from part A before it is mixed with the curative to remove caught air at 1 to 5 mm of mercury.

      3. Mix CoMat 07-069 POLYURETHANE RESIN at 105 deg to 176 deg F (40 deg to 80 deg C) in a percentage of 99.5 to 100.5 parts by weight part A to 10.5 to 11.5 parts by weight part B.

      4. Remove all the air from the mixture to remove the caught air caused by mixing at 10 mm of mercury for 3 to 5 minutes.

      5. Put mixed material into mould or fixtures in a procedure to prevent air bubbles or pockets forming.

      6. Cure at 167 to 185 deg F (75 to 85 deg C) for four hours or 77 deg F (25 deg C) for seven days.

2. SUBTASK 70-36-03-220-001 Inspection of Moulding

   1. Applies at final inspection of the rubber and can be applied at the first inspection after installation of the rubber when necessary to give access for repair.

   2. Acceptance levels.

      1. Unless differently specified in the Engine Manual, defects and their acceptance levels shown in Figure.

      2. Unless differently specified in the Engine Manual, surface is as mould condition.

Figure: Defects and permitted levels

Defects and permitted levels