Weight of Mini Ball Bath Bombs


What is the weight of a round, dry bath bomb made on the Willow Press with the mini-ball mold?


The ingredients can make a difference as to the weight of the bath bombs. I have found that my dried weights for the Mini-Ball is between 3 and 3.5 ounces.

Materials of Bath Bomb Molds


What materials are the bath bomb molds manufactured with? Plastic, steel, silicone, etc?


Depends on the size chosen as to the exact materials of the molds. There is plastic, steel, acrylic, wood. Some molds are of a special resin.

Mold Sizes


How many molds would you need if you only offered one size?


We actually offer three sizes, 2.25″, 2.5″ and 3″.

Seam on Bath Bombs


Do the bath bombs have a visible seam?


Yes. We provide a De-Ringer to remove most of it but there is no physical way to remove the ring, from any balled Bath Bomb other than by brushing the seam by hand.

Some companies leave the ring (we call it a Saturn ring) and actually elongate the Bath Bomb to leave it more prominent.

Perfectly Round Bath Bombs?


Are the bath bombs perfectly round or do they have any flat spots on them?


The amount of material used determines whether they are perfectly round or elongated.

There is tube which you fill by hand or it can be filled using a measuring cup.

When filled the volume of material is correct for the average size Bath Bomb.

If you wish a taller Bath Bomb or a ring around it then you can pack a little more in. There are no flat spots.

Press One Bath Bomb every 15 Seconds


Does the 10-15 second time when using the Willow Bath Bomb Press™ include pouring in the mixture?


Yes, with a little experience this should be easy to do. This does not include of course, mixing the materials. Some mix a lot at a time and some just few pieces at a time. The number of ingredients used, measuring methods, etc. will also affect how quickly the batch is mixed and ready to press.

In all cases; the use of efficient production methods, will speed the number of pieces per minute.

For example:

  • Having all the dry ingredients measured and mixed.
  • Having all the liquids mixed.
  • Multiple batches in readiness to combine ingredients, set up for the entire days work.
  • Having a fast and effective means of mixing.
  • Having work space height, stools, access, drying racks and work flow properly arranged, will make a world of difference.
  • A few minors factors that are often forgotten are clean up, breaks, start up, think time, etc.
  • These can add up to an amazing amount of lost time.
  • When you set up to produce, try to do it for an entire work day.

For the production described, screw the Press down to your work table. It will beef up the press table and also prevent it from moving around.

Feeding Material into Bath Bomb Mold


Do each bath bomb’s materials need to be fed into the mold individually or can you load batches of mix and then control how much goes into the mold?


For the moment, each mold needs to be filled individually; however, we are working on a pneumatic press that would press out multiple bath bombs at a time.


  • Many of our customers buy extra tubes and the bottom part of the mold.
  • One person fills the tubes and hands them it to the person using the press.
  • They can also mix the materials while the other person is arranging the balls onto the drying trays and stacking, etc.

Concerning a Hopper


How do the raw materials get placed into the hopper and where is the hopper?


There is not a hopper. There is tube which you fill by hand or it can be filled using a measuring cup. When filled, the volume of material is correct for the average size Bath Bomb. If you wish a taller Bath Bomb or a ring around it, then you can pack a little more in. Most people within a short time of using the press, just go by feel, as it both faster and surprisingly accurate.

Concerning a Hopper: As you know, since you are making Bath Bombs now, that the material when mixed, does not flow well when poured.

  • It clings, packs and by it’s own weight compresses itself.
  • Therefore to use a hopper, one would have to design an auger method to dispense the material.
  • Since the material dries quickly and only a couple gallons at a time can be mixed, it may not be a cost effective way of dispensing the material, given the fact that it must be mixed extremely well, to prevent cracking and provide a consistent pack.

Height of Bath Bombs


How tall can you make the Cylinder, Cuber and Tablet Bath bombs?


The Cuber, Tablet and Cylinder molds allow you to go up to almost 2” in depth.

Adjust depth for Cylinder, Cuber and Tablet molds


How do you adjust the depth for the Cylinder, Cuber and Tablet molds?


The press can be set to stop at most any depth, so if you wanted 1″ deep, then you could adjust it accordingly.

Most people use the volume of material to set depth and just go more by feel. In the end this is quicker.

The extra depth of the mold, allows you to put in whatever material you need for density and weight.

Using Fillable Christmas Tree Ornaments


I make bath bombs using Plastic Acrylic Fillable Christmas Ball Ornaments. Is using your Bath Bomb Press any faster? Does it make harder bath bombs?


The answer to both of your questions is, YES.

One very important and added benefit is, and we don’t mean to alarm you and know that it is difficult to stay on top of everything; your customers will not be exposed to toxicity, inherent from the decomposing plastic.

I am sure you have noticed how your molds eventually degrade, get sticky and start…sort of disappearing? The plastic is breaking down, out-gassing and…..it is becoming part of your Bath Bombs. The citric acid, oils and fragrances break down the plastic and it’s all downhill from there. But, that is not the bigger problem, your customer is getting into a tub with warm to very warm water and then soaking in it. Your skin is the largest organ of your body, it is very porous and it is only a short trip to the blood stream.

Our molds are made of materials approved for containing food and or water. They do not break down or degrade with citric acid, fragrance oils, essential oils, vegetable oils, etc.

Additives in your Bath Bombs

Use of Additives

The tightest, fine-textured, hardest, fizziest, most shippable Bath Bombs, are just plain ole’…..citric acid, baking soda, scent, some oil & witch hazel.

Any dry ingredient other that Baking Soda and Citric Acid can ruin Bath Bomb production and Bath Bomb (BB) quality.

Think about it; adding things like salt, cornstarch, Epsom salt or clay, is useless in the average tub full of water. 40 gallons of water and a tea-spoon or two of what? The recommendation for Epsom Salts in the aver-age tub of water is 2-3 cups, 2 1/2 being standard. There are 16 table-spoons in a cup. So ideally you need at least, 32 tablespoons of Epsom salts to really do your customer any good.

What your customer may figure out; Here’s an example of “iffy” marketing. How many people buy a Hershey chocolate bar thinking they are getting 100% milk chocolate?…..I bet millions. They actually do get some 100% chocolate but the most of it, is…..other stuff. Do you want to be found wanting when your customer adds up how much they really are getting from “therapeutic ingredients” in your product?

Here are some of the benefits they can get; true aromatherapy (Eos), moisturizing for the skin, a pleasing and refreshing aroma, fun & relaxation because it is more than just a bathtub full of water.

Some Additives are like trying to mix oil and water to a bath bomb.

Some powders simply do not bond well.

If after using the starting recipe you decide to try adding other powders and have challenges, try reducing the amount used.

The following have been found to detract from bonding and may cause cracking, splitting of round BBs, draw excess moisture and degrade faster on the shelf. They will not compact as well and will not ship as well. Epsom Salt, Cornstarch, Salt, Sodium Lauryl Sulfate (SLS).

Here are some solutions:

  • Put the powder in the center of the BB. If the ball or shape is large enough, add half the material, make a depression, then add a small amount of powder, fill rest of the way and press.
  • Put the material on top in a dimple and cover with frosting, cocoa but-ter, etc.