I’m guessing you landed here because you need a resin dictionary. And I get why. There are a bunch of words and phrases revolving around epoxy resin that you need to know the meaning of so you don’t misunderstand something.
Or make resin mistakes.
RESIN DICTIONARY Terms beginning with the letters A through C
Accelerator: An additive that speeds up the chemical reaction between the catalyst and resin. It’s not something you want to use unless you’re experienced with resin.
Air Bubble Void: An air entrapment on a surface or within your resin casting. Air bubbles are one of the biggest challenges resin crafters face.
⭐️ BONUS: Here are ten tips to get rid of resin bubbles.
Bezel: A jewelry finding with a rim that can hold resin. They may also be called cups.
Casting (process): You pour the mixed resin into a space, usually a mold. Then allow it to cure.
Casting (object): A cured resin piece.
Catalyst: An agent that causes the resin to dry. It’s labeled as Part B in your resin kit and can also be called the hardener. It’s sold in a separate container from the resin (part A) and made to match the specific resin included in your kit.
Cavity: A depression in your resin molds. It’s the space where you pour resin.
Cure (process): The reaction between resin and hardener that causes it to set.
Cure Inhibition: When a contaminant prevents resin from curing as expected. (This is not a good thing.)
⭐️ BONUS: Reasons why your resin didn’t cure.
Cure Time: How long it takes for resin or silicone to cure, dry, or harden completely.
⭐️ BONUS: How long does it take resin to cure?
Curing Temperature: The temperature range your room and the surrounding area need to be for your resin to cure.
⭐️ BONUS: What is the ideal temperature for resin?
RESIN DICTIONARY Terms beginning with the letters D through G
Demolding: The process of removing a model or resin casting from a mold.
Demolding time: The time when the resin is cured enough that you can remove it from a mold. It can still be soft and will require more time to cure fully.
Doming: The process of using resin to create a dome on a surface. It also refers to a resin suitable for this process.
Embedding: When you include an object or other finding in resin.
Epoxy: Class of synthetic thermosetting polymers containing epoxide groups. One of the most widely available resins.
⭐️ BONUS: What are the different types of epoxy?
Exothermic: A chemical reaction that causes heat production. This is a necessary reaction for the resin to turn from a liquid to a solid.
⭐️ BONUS: Is it normal for my resin to get hot?
Findings: Parts used to make resin castings wearable as jewelry.
⭐️ BONUS: What are the finding options for resin jewelry?
Flash or Flashing: Excess material attached to a mold or casting caused by material leakage outside of a border.
Gel Stage: The semi-solid stage when resin turns from a liquid to a solid. It’s the consistency of jelly.
Gel Time: The time it takes to reach the semi-solid stage. The resin will be tacky or sticky when it comes to this point.
⭐️ BONUS: What is the gel time of resin?
RESIN DICTIONARY Terms beginning with the letters H through P
Inclusions: This is anything added to your resin. These can be resin colors, found objects, art and craft items, or jewelry findings.
Mix Ratio: The proper proportions (either by weight or volume) of part A and part B (resin and hardener) you mix together.
Model: An object or pattern that serves as the template for a mold. Models can be made of wood, plastic, wax, clay, metal, plaster, bone, rock, etc. A model can be any shape, pattern, or texture you want to reproduce.
Mold Release: A compound applied in a thin layer to the surface of an item, either a model or mold. It makes demolding easier.
⭐️ BONUS: Three reasons why I always use resin mold release.
Molds: A form that you pour liquid into. As it cures, it takes on the shape of the form. Resin crafting molds are most commonly made from plastic or silicone.
MSDS: Material Safety Data Sheet. This term is outdated. See SDS.
Open Time: See pot time.
Polyester resin: A type of resin made from a polyester base. It mixes with drops of hardener based on the volume and thickness of the casting. This resin type should only be used in molds.
⭐️ BONUS: Five things you need to know about polyester casting resin.
Polyurethane: A synthetic resin that cures very hard. It has a short pot time and is not a suitable resin for beginners. It should only be used in molds.
Pot time: The amount of time you have to work with mixed resin. It may also be referred to as pot life or open time.
Pressure Casting: This is a process where you put a resin in a chamber attached to an air compressor. Air is forced into the pressure pot, which shrinks bubbles. The resin is left in the pot for the entire curing time.
Pressure Pot: Chamber used for pressure casting.
RESIN DICTIONARY Terms beginning with the letters R through Z
Resin: A class of organic materials that may be natural or synthetic, thermoplastic or thermosetting.
⭐️ BONUS: What is resin?
SDS: Safety Data Sheet. Contains information on chemicals, including composition, potential hazards, and safe use instructions.
Sealer or Sealing Agent: Use it for porous inclusions that will take up moisture stains when placed into resin.
⭐️ BONUS: How to seal paper for resin.
Shore Hardness: A measurement of the hardness of different materials.
Silicone: A rubbery resin that usually has resistance to temperature, water, and chemicals. It’s ideal for mold making.
Silicone Putty: Silicone compounds that you can knead together by hand. It’s excellent for making molds quickly.
⭐️ BONUS: How to use silicone putty to DIY resin molds.
Tensile Properties: Ultimate Tensile Strength is the force, measured in PSI, needed to stretch a material until it breaks.
Tensile strength: Tensile strength measures the stress required to pull something to the point where it breaks.
Thermoplastic: Resins that will remelt when heated.
Thermosetting: Resins that are set permanently after heating. These are the resins we use in jewelry making and crafting.
UV Resin: A one-part resin that requires an ultraviolet lamp or sunlight to cure.
Vacuum casting: Process where resin is placed into a chamber, and the air is removed with a vacuum pump. Air bubbles come to the surface to pop.
⭐️ BONUS: Here’s the difference between vacuum casting and pressure casting.
Viscosity: Refers to how a substance will flow. A material, like water, with low viscosity, will flow easily. A material, like peanut butter, with a high viscosity, will not flow easily. If at all.
Eager to get started crafting with resin but overwhelmed with where to start?
I felt the same way when I started creating with resin. It’s why I wrote the beginner resin book, Resin Fundamentals. I share everything beginners need to know to succeed with resin beyond the dictionary words you see here. They are the details I wish someone had shared with me when I started with epoxy crafts. Buy the PDF book now and get a download link in minutes.
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