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Candle molds - Rubber molds

Rubber and latex molds are typically used to create a type of candle named novelty candles.
An exhaustive list of every shape that can be obtained with rubber molds does not exist, but here's a short excerpt of what you could make: dinosaurs (see the picture on the right-hand side), witches, pumpkins, smurfs, bouddahs, bears, ducks, cows, pigs, fruits, unicorns, Venus de Milo's, rabbits, Santa's,... in other words: anything!

The main advantage of rubber molds, compared to polycarbonate and metal molds, is the variety of shapes you can obtain and the precision of the details (the triceratops' horns, Santa's nose), the elasticity of the mold allowing to unmold the finished candle without breaking any of its details.

The main disadvantage of rubber molds is that they're made of... rubber! This means they're flexible and won't stay upright once you've poured the wax into it. So you'll have to make a little support for the mold. The base of a rubber mold is typically larger than the rest and is shaped as a "lip". Using the diameter or the shape of this lip as a base, cut a hole in a piece of strong cardboard. The hole will have to be wide enough to let the body of the mold through but narrow enough so that the lip won't go through. You can then place the cardboard (with the mold upside down) on top of any container and you'll have a simple and practical support for THIS rubber mold (the size and shape of the lip will probably be different for every mold).


CAUTION!
Never use stearic acid in combination with a rubber mold. Stearic acid is just that, an acid, and your mold would become unusable after just a few uses. Replace stearic acid with Vybar™


How to wick a rubber mold?

Make a hole in the rubber mold and thread the wick through it with a large wick needle When you buy them, rubber molds usually come without a wick hole.
Locate the place that will become the top of the candle a make a hole there using a wick needle or a thin knitting needle.
Insert the wick through that newly created hole, making sure you leave about 2 centimeters of wick on both sides of the mold.
A little mold sealer to seal the wick hole... Just like you would do with a metal or polycarbonate mold, you need to ensure liquid wax will not escape through the wick hole. To this purpose, use a little mold sealer as showed on the picture.
... and a wick pin on the other side. On the open side of the mold, tighten the wick and keep it straight and centered with a wick pin.
As explained above, make a little cardboard support for the mold and insert the mold in this support. This will help you keep everything stable while you pour the paraffin.


Rubber molds: precautions and maintenance

Never use solvents to clean this type of mold!
The best and safest way to clean them is to fill it with hot water, wait a few moments then pour the water out in a bucket.
Because these molds can be turned inside out, it's easy to remove any wax residue stuck in the corners.

When unmolding, always start with the side that has the least reliefs Before you start unmolding the finished candle, coat the outside of the mold with a little vegetal oil. This will allow the mold to roll on itself easier.
Most rubber molds have a side with less reliefs than the other. Where our triceratops is concerned, you would start with the tail side. If you start with the head, you might break the nose, the horns or the complete head...
When done, clean the mold thoroughly and put it away, protected from dust and sunlight.



Tip
Learn to create your own latex molds: read the article titled How to make your own latex candle molds?

Rubber molds let you create candles in a variety of shapes and a precision in details impossible to achieve with metal or polycarbonate molds
Rubber molds let you create candles in a variety of shapes and a precision in details impossible to achieve with metal or polycarbonate molds

Related articles:
  • How to make your own latex candle molds?


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