Frequently Asked Questions
Welcome to our FAQ. Please check to see if your question is answered here, and if not email Lenore@worbla.com
What is Worbla?
Worbla’s is the brand name for a line of easy to use thermoplastics popular in costuming, crafting and theatre. Worbla’s products can be heat shaped with a heat gun and are safe for the average crafter or costumer to use without special tools.
The Worbla’s product line now includes a total of 8 sheet and pellet plastics. Please see their respective pages here for more information.
For ease of convenience, Worbla’s Art products are often shortened to simply Worbla as a whole, and specific products are referred to as ‘Black Worbla’, ‘Mesh Worbla’, or ‘Worbla Pearly’ and so on.
How thick is Worbla?
Worbla sheet products are injection molded and are approx 1mm thick, with .1 to .2 variation. Kobracast is thinner and closer to .65mm in thickness.
What tools do you use?
Worbla products can be cut with regular scissors, drawn on with pen or marker, sanded, glued with glues meant for plastics, and painted with anything from acrylics to spray paint. A heat gun is our most suggested method for heating Worbla products. To cut relief designs a hot knife can be used (with proper ventilation), or you can use a laser cutter or home cutting machine such as a Cricut.
Gloves are necessary when working with TranspArt and Crystal Art, as their heat range is over boiling. Gloves are not necessary but can be helpful in working with our other products.
Worbla should be worked on a flat, heat resistant surface. Worbla will try to stick to your surfaces so we suggest using a silicone mat or parchment paper as a barrier to prevent sticking. Pellet products work best when heated in silicone containers or ceramic that will not be used again for cooking. Please check their respective pages here for more information.
Where can I buy Worbla?
Check out our where to buy page for a full list of retailers, but Worbla can be bought from our NA partner, Cosplaysupplies.com, as well as major chains such as Blick Art Materials, Tap Plastics, and more.
How should I store Worbla? How do I flatten rolled Worbla?
Worbla’s products and leftover scraps are best stored in a dry, room temperature conditions of roughly 15°C to 25°C (59°F to 77°F). Keep away from sources of heat; if stored in a cold area, allow the sheets to warm before working with them as very cold Worbla sheets can be brittle. Worbla sheets are typically shipped in tight rolls. If you are storing your Worbla, we suggest unrolling them into something looser: if left in tight rolls they will be difficult to unroll later. If your Worbla is curling when you unroll it, clear a space and lay it flat in a warm room with weights on each corner for 24 hours. This should help flatten it for use.
How do you attach Worbla?
To attach most Worbla products to one another, you can use the self adhesive built into the plastic that activates when it is heated. Simply press two heated pieces together to attach them – always heat both sides. You can also use glues meant for plastics such as contact cement or epoxy glues when the pieces are cool. For Worbla’s TranspArt, you can heat and attach pieces together but you may notice some warping of your final shape as TranspArt must be quite hot to join pieces firmly. For areas where a join needs to be visible and clear, you can use clear glues such as Cyanoacrylates / Krazy Glue to join pieces, or you can use other glues for plastics to join TranspArt to itself or other Worbla products.
To attach finished pieces to costumes such as leg armor or shoulder pauldrons, you can use Velcro, leather strapping, and strong magnets. Check out our attachment tutorials for more.
Can I use Worbla on my Car/Plane/Houseboat/Float?
We would not suggest using this plastic for anything other than purely decorative purpose on items that are for display only. Worbla is heat formable (please see the point below regarding Worbla and the sun) and is not made for extreme heat variations such as how hot asphalt can become in full sun in the summer. We have no idea how well it would handle flying and we have no interest in testing to find that out.
Can I take Worbla into the pool? Lake? Sea?
Well, that depends on several factors. Worbla itself is fine in water, though it’s suggested you rinse your pieces off afterwards to remove salt and chlorine. If your Worbla is wrapped around foam with open areas (such as the folding method) then you may have more issues with the foam reacting to the chlorine/salt water, and remember that your paint will be what is the most affected by the water. Make sure your paint is waterproof and well sealed.
Can I use Worbla for an Aquarium? Pond? Garden display?
Worbla hasn’t been tested for long-term underwater use, but we expect that it will behave as most plastics do. It’s suggested that Pearly Worbla be used for water features, as it is less porous than Worbla’s Finest or Black Art. All Worbla products are generally safe for the outdoors but not suggested for long term installation pieces. Worbla does not have a UV rating, and keep in mind that heat can effect Worbla (as noted below). We do not know if Worbla will leech anything into the water over time to effect fish or PH balance.
Can I use Worbla’s TranspArt for a windshield, visor, goggles, window, or similar?
Not to be pedantic but while you absolutely can use TranspArt for these applications, we do not suggest you do so. TranspArt is not optically clear as it has clear injection lines that run through it and the plastic warps light slightly as it passes through. TranspArt is not like an acrylic so much as it is like a very very very strong vinyl in regards to how it handles and shapes, and so large forms will also need support and cannot be simply ‘set and left’ the way a straight acrylic might be capable of.
Will Worbla melt in the sun/desert/really hot day/at my LARP/on Mars?
Costumes made of Worbla will generally manage the heat of outdoors, though pieces can get a bit soft in extreme temperatures and cosplayers in extreme heat for extended periods of time have reported large props or unsupported pieces starting to ‘sag’.
Worbla shaped free-form (without any core or backing) will likely react in heat faster than Worbla shaped over a core. For large props and other work, we don’t suggest using Worbla alone if it will be left outside or under direct sun, and to build with a core for support. Always consider temperature ranges before working with Worbla for outdoor displays.
You must not store your Worbla in a car, or inside a tent or shed in the sun, as it will begin to soften or warp completely. (A car can reach an indoor temp of 80°C / 175°F in the sun, and Worbla’s Finest Art begins to soften at 65°C / 150°F. This heat can soften Worbla, and if it is weighed down it will shift and warp, or stick to itself.)
Can I attach Worbla to metal/wood/foam/fabric/leather/bone?
Yes. Worbla products can be joined to nearly any material. The natural adhesive in Worbla’s Finest Art or Black Art may be enough, but using a glue is strongly suggested. Contact Cement and epoxies work well and hot glue can often be enough for most products. Always test your glue on both materials and follow safety instructions.
Is Worbla toxic?
All of Worbla’s Product Line are Non Toxic, contaminant free and conform to ASTM D-4236*. However, Worbla products are not tested for use as mouth appliances or for food use. We do not suggest using Worbla products for something you will store food in, mould food in, or apply to your teeth.
*Worbla’s Kobracast Art and Pearly Art have not completed ASTM D-4236 testing at this time, but both are non-toxic and contaminant free.
How durable is Worbla? Can I use it for Airsoft or LARP?
There’s no specific tensile rating for Worbla. It works extremely well for costume purposes, but we do not know how well Worbla would take specific impact damage. If you are designing something to take blows, keep padding in mind and consider building your pieces off of thicker foam as a core.
In addition, Ruth, who runs Alhazreds Ghost blog has offered this advice on Worbla’s Finest Art for LARP:
Very basically, if you do it right and avoid a couple of pitfalls, Worbla LARP armour can be fun to make, not overly expensive, completely personalized, and relatively easy to repair if something doesn’t go as planned.
I would advise you to stay away from making large or flat structures such as helmets or breastplates, as these may crack or split if shock-loaded with weight (i.e., when you fall on them, or when struck hard), and this could lead to potential injury. If you’re confident that you can create something safely, feel free to give it a go, but I’d personally avoid it, and stick to smaller pieces like bracers and greaves, or using the Worbla for constructing scale or splint mail.
How strong is Worbla? Can I use it to build a very large prop?
Worbla is strong, but is not made to support weight in itself and can snap if too much weight is placed on one area. If you need to make something large you are best to use a core of foam or pvc to support the weight. Large, long props or accessories that need to hang from a point on your costume will need a large base of support, or the weight will make the plastic bend.
What sort of foam can you use with Worbla?
For the sandwich and backing methods many people use foam sheets you find in craft stores – usually called fun foam, craft foam or foamies. You can also use thicker foams, such as what yoga mats or garage flooring are made of which is often called EVA foam, or L200 foam which is commonly used in theater and stage work. You can also use the hard pink insulation foam, or expanding foam, and carve shapes that you then cover with Worbla for additional strength and rigidity. In addition to foam you can also use aluminum foil, paper mache, balsa wood or cardstock to add body and strength to your Worbla without increasing weight.
Sandwich method? What is that?
Worbla’s sheet plastics, if shaped by hand completely, can end up uneven or lumpy. A way of keeping it smooth is to back it with a thin sheet of foam. For extra strength, sometimes the foam is sandwiched between two pieces of Worbla, especially useful for pieces that will be under high stress. We have a tutorial explaining the process here. You can also use a method called the folding method, or combine both, depending on the strength you need and your budget for the project.
How much should I buy?
The best way to see how much you need is to make your pattern first. Then you lay your pieces out as close as possible together, measuring around them to see how small a sheet they will all fit onto. Remember if you’re sandwiching you’ll need double the amount. A visual guide is available here.
Can Worbla be laser cut?
Yes! Worbla products can be cut using commercial laser cutters well. You’ll need to test to see what settings work best for you. Please refer to our pages on laser cutting here.
Do you have MSDS sheets for Worbla Products?
Yes, please email Lenore@worbla.com for the MSDS sheets.
Do you have other questions? Email them to Lenore@worbla.com