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Moulding and Casting

Always read data sheet for your material as each one may vary!

Reading Data Sheet of the Silicon Oomoo

Oomoo 30

  • 30 min pot life
  • 6 hours cure time
  • A:B mix volume 1:1
  • A:B mix weight 1:1.3

Oomoo 25

  • 15 minutes
  • 75 minutes cure time
  • A:B mix volume 1:1
  • A:B mix weight 1:1.3

Both:

  • Cure at room temperature
  • They don’t have a great tear strength
  • Simple one- or two- piece moulds
  • Can use a sealing agent to prevent inhibition

Safety:

  • Use in a well ventilated area
  • Wear gloves (only vinyl gloves not latex gloves), goggles, long sleeves

Mould max is better for high tear strength

Mixing and Measuring:

  • Mix together the parts well with tool of your choice
  • Make sure to scrape the bottom of the pot
  • Keep going until no colour streaks are visible
  • Mix for at least 3 minutes
  • Mixing container should have straight sides and a flat bottom

 Pouring:

  • A uniform flow is best to avoid trapped air
  • A thin steady flow is best
  • Start from the top of your pieces and let the silicon move down the piece

Curing:

  • Allow to cure as advised (6hour for Oomoo 30 and 75 minutes for Oomoo 25)
  • Post curing an extra 4 hours will prevent any residue moisture or alcohol
  • Do not cure rubber where temperature is less than 18oC

Using mould:

  • No release agent is needed when casting wax or gypsum
  • We advise release agent when using polyurethane, polyester and epoxy resin

Mould performance and storage:

  • The moulds life time is dependant on the material used to cast with
  • When stored wipe down with soapy water and dry off
  • Stored in a cool dry environment on a level surface
  • Two part moulds should be stored together

silicon_setup silicon_packaging silicon_pour

Reading Data Sheet of the Clear Cast 326

Oomoo 325

  • 2.5 min pot life
  • 10 minutes cure time
  • A:B mix volume 1:1
  • A:B mix weight 115:100
  • Shrinkage = 0.01 in/in

Oomoo 326

  • 7-9 min pot life
  • 60 minutes cure time
  • A:B mix volume 1:1
  • A:B mix weight 115:100
  • Shrinkage = 0.0075 in/in

Oomoo 327

  • 10-20 minutes
  • 2-4 hours cure time
  • A:B mix volume 1:1
  • A:B mix weight 115:100
  • Shrinkage = 0.0075 in/in

Features:

  • developed specifically for adding colour pigments and fillers

Safety:

  • Large mass castings will get very hot and shrink more
  • Materials should be used in a warm environment
  • Materials should be stored in a warm environment
  • Limited shelf life and should be used a soon as possible
  • All liquid urethanes are moisture sensitive and will absorb atmospheric moisture
  • Tools and containers should be clean and made from metal, glass or plastic
  • Mixing should be done in a well ventilated area
  • Wear safety glasses, long sleeves and rubber gloves

Applying a release agent:

  • This will help release your piece when casting into or over most surfaces
  • Apply release and brush with a soft sponge over all surfaces
  • Follow with a light mist
  • Let release agent dry for 30 minutes
  • Most silicon mould do not need a release agent unless doing silicon on silicon
  • Appalling a release agent prolongs the life of your mould

Mixing and Measuring:

  • Stir or shake both parts A and B
  • Measure equal volumes (115A:100B by weight)
  • Mix thoroughly
  • Stir making sure you scrape the sides and bottom of the mixing container several times
  • Avoid splashing over container

 Pouring:

  • Pour your mixture in the lowest point of the container
  • Allow the mixture to seek the areas do not push into areas

Curing:

  • Leave to cure in a well ventilated room
  • Do not inhale or breathe in fumes
  • Cast large mass objects may be hot to the touch
  • Allow casting to cure completely to room temperature before handling

Post Curing:

  • Casting will reach ‘full cast’ faster and reach Maximus physical properties if post cure.
  • Allow material to cure for recommended cure time and then left at room temperature for another 4-6 hours
  • Allow to come to room temperature before handling

Performance:

  • Cured casts are rigid and durable
  • They resist moisture, moderate heat, solvents, dilute acid and can be machined primed/ painted or bonded to other surfaces
  • If machining cured material wear a dust mask

resin_bottles resin_plaster

Plaster Data Sheet

Use:

  • For moulding figurines and decorative objects. Can be sanded, tinted, perfumed, painted and varnished with Pebeo products

Demoulding:

  • 1 Hour

Storage:

  • 6 months after opening, keep bag tightly closed away from moisture

Cleaning:

  • Soap and water

Instructions:

  1. Measure 1 part water to 3 parts plaster
  2. Pour water into a clean container
  3. Sprinkle the plaster evenly across the surface without stirring. Allow to rest for 1 minutes, then stir for 1 mine with a spatula
  4. Pour slowly against the side of the mould
  5. Allow 60 minutes before remoulding
  6. To accelerate drying, place object near a heat source or briefly in the microwave

Gedeo tips:

  • Cold water will slow down the setting process, hot water or beating will accelerate it
  • To accelerate drying, briefly place the object in the microwave
  • A little talc incorporated during mixing or sprinkled and then dusted on a wet plaster decoration will give a smooth and silky finish
  • Add water based acrylic to colour
  • For complex shapes, empty and start over a second time

Precautions:

  • Do not ingest or breathe dust

plaster_box plaster_sheet

Comparing Test smaples with eachother



Katie's Tests

all_casts

casts

Jonny's Tests

  • Silicone dog pre-mould jonny 1
  • Silicone house pre- mould jonny 2
  • Resin house jonny 3 jonny 4
Last update: May 18, 2021