HTV Meets Heat in the Wrong Way

Right now in Michigan the weather has been averaging 85-93°F with the humidity near 66%. Needless to say….

The temperature so hot right now meme

Don’t get me wrong, I love this weather! This kind of weather makes me want to go hang out by the pool or the beach, go on a boat, have a barbecue, and just enjoy the outdoors. Then I think one of my favorite moments is that feeling of being soaked in sweat from running around outdoors in the heat, to walking into my air-conditioned house. You know…

The feeling of walking out of the heat and into the a/c

This made me start to think about how the temperature can also have a direct affect on our heat transfer vinyl.

When storing your rolls or sheets of Siser HTV, you are going to want to make sure they are placed in a dry area that can be climate controlled. Room temperature is averaged out at about 70°F. This is the ideal temperature we suggest for the storage of our materials. We don’t suggest exceeding 75-80°F for your room temperature.

“What happens to the materials when it starts to exceed 80°F,” you ask?

Now this will all vary on your humidity/moisture level in the room as well as if you have the material exposed to direct sunlight. What I mean by “direct sunlight” is having your material right next to a window where the sun may be beaming directly on it. Even though your thermostat may say 70°F, having the heat of the sun directly on the material will cause the adhesive to slowly start activating. Once the adhesive starts activating, it will begin to weaken its durability when applied to your garment. You may not tangibly notice a difference on the roll, which will be due to the adhesive liquefying under the heat of the sun and then back to a solid within the time you get the roll to your cutter.

The other major attribute to consider is the materials with our pressure sensitive carrier (the EasyWeed family, Glitter, etc). What may happen when too much heat/moisture is exposed to these pressure sensitive materials is the vinyl will begin to prematurely fall off of the carrier. This will cause issues when you go to cut on your roll or sheet of vinyl. This is essentially the theory of our “Heat Press Trick” by warming up the carrier to make your weeding process even easier. This is all good when you go to weed your transfer, but can cause problems if it’s falling off when you are cutting the material. The vinyl may start waving as the blade of your cutter moves across it, causing a bad cut with your design, or bunching up and potentially causing a motor error for your cutter. If the adhesive of the carrier is manipulated badly, your design may not even stay on the carrier for you to press with.

This same concern includes our TTD Easy Mask and TTD High Tack Mask for our print and cut materials. These masks are strictly pressure sensitive materials that are tools to mask your digital transfer and act as the carrier. If these masks are subjected to too much heat/moisture it will deplete the stickiness on the polyester. The big problem with that is it will make it very difficult, or even impossible, to get your print and cut material to bond with the mask.

I'm Melting Wizard of Oz meme

These are very vital things to remember when you go to store your Siser HTV. We all need the sun in our lives, and we all enjoy the warmth…..but these can act as the “Heat Miser” for our materials.

Heat Miser meme

If you have any questions or concerns about this, please feel free to leave them in the comment section here! 🙂

By |2018-03-23T08:08:14+00:00August 1st, 2016|Informational|21 Comments

About the Author:

Joe has been involved with Print and Cut Materials, Heat Transfer Vinyl, and Direct to Garment Printing for the last 8 years. Joe has been acting for a number of years and is the face of Siser in our popular how-to videos.

21 Comments

  1. Lynn Faggard June 22, 2017 at 2:13 pm - Reply

    I can control the environment for my HTV once I receive it. I worry that my HTV may suffer extreme heat en route to me from my supplier. I live in South Alabama where it’ could be 90° in the shade during the summer. I order HTV from a distributor in California So I assume the vinyl is transported on a cargo plane and then a UPS van before it reaches my doorstep. I have experienced problems with the carrier sheet releasing during the weeding process and then the cut HTV will not stick to the carrier sheet. As an end user, is there anything I can do to get better performance from my HTV?

    • Lily June 26, 2017 at 10:44 am - Reply

      Hi Lynn, when your HTV is delivered bring it inside and let it come to room temperature over a 24 hour period. I know most customers can’t wait to use the material the second it arrives, but allowing the heat transfer vinyl to acclimatize will yield the best cutting and application results.

  2. L. Beck June 22, 2017 at 5:26 pm - Reply

    Can you use a light mist of prospray on carrier to keep vinyl adhered for cutting or is the adhesive sided the HTV too damaged to then stick to shirts properly?

    • Lily June 26, 2017 at 10:52 am - Reply

      Hi! I do my best to answer all comments thoroughly, but I’m having difficulty fully understanding the issue you’re trying to resolve. Can you please clarify what prospray is and the process you’d be using it with HTV?

      • L. Beck July 10, 2017 at 1:08 pm - Reply

        ProSpray is basically a temporary bonding spray (I use if for dye sublimation to adhere the paper to the substrate). It has a tack that gets the vinyl to adhere to the carrier, then release when heat is applied (pressed). I’ve tried it and it seems to work, but wanted to make sure if that if the carrier separates that doesn’t necessarily mean the vinyl adhesive is bad. Does that help the explanation? Sorry if confusing…

        • Lily July 11, 2017 at 11:49 am - Reply

          The HTV is still usable even if the carrier mask is releasing as long as the vinyl is not discolored or exhibiting signs of deterioration. Pro spray will likely have no adverse effects on the adhesive side of the vinyl. If you’re finding that the spray doesn’t effect the appearance of the vinyl, you should be fine to continue, however keep in mind the spray may have possible discoloring effects on certain vinyls.

  3. Yessenia June 23, 2017 at 1:32 am - Reply

    I just thinking about this topic this week. I was also thinking of how long does the HTV and the other vinyls last or good for? I don’t storage where there is direct natural light. We keep a humidifier on year around. So how are they good for? TIA

    • Lily June 27, 2017 at 10:07 am - Reply

      Yessenia, Siser materials can have an indefinite shelf life depending on how they are stored. The optimal conditions for storage are to keep the materials away from direct sunlight, in a cool, dry area. Temperature should be below 72° F/ 22° C but above 32° F/ 0° C and humidity should be no more than 50%.

  4. Teresa October 21, 2017 at 11:06 am - Reply

    My customer has a door that opens into a 3 season room. She is wanting a design on the door. While it will never see sunlight, it will be subjected to cold and heat. Will HTV stay through the seasons?

    • Lily October 24, 2017 at 10:45 am - Reply

      Teresa, heat transfer vinyl is not really recommended for decorating a hard door. If you made a banner or wall hanging for the door it could be decorated with HTV. However, if you’re looking to decorate the actual door’s surface then I’d suggest using a permanent sign vinyl.

  5. Dave November 17, 2017 at 8:08 am - Reply

    I’m having issues with the HTV Easy Weed Stretch. On areas of the graphic that have sharp points, etc. when I’m weeding, the part that shouldn’t come off the backing is! It appears that the blade doesn’t complete the cut to the point. I’ve tried new blades, different pressures, etc. on my Cricut and it still does this. I don’t have this issue with Siser Easy Weed that isn’t stretch. Do you have any suggestions?

    • Lily November 17, 2017 at 8:42 am - Reply

      Hi Dave, sorry to hear you’re having troubles! With intricate/fine detail artwork sometimes EasyWeed Stretch can benefit from a slower speed setting that prevents the blade from bouncing and leaving unfinished cuts. Unfortunately, the Cricut does not have a setting that allows you to slow down the speed, so you may want to use an exact knife as you weed to finish the cut at the point.

  6. X December 7, 2017 at 1:07 pm - Reply

    My house recently flooded and the movers had everything in storage while we were undergoing repairs. I live in Houston where it’s hot and I wasn’t home to move my htv upstairs instead of it being stored with everything else. I recently made shirts with smooth Siser and last night made a shirt with glitter Siser, they’re all peeling off the shirts now. I literally have over a thousand dollars in htv, please tell me there’s a trick to try so I don’t have to throw it all away and start over. I tried pressing the glitter at 320 multiple times and the smooth at 305 up to 315 and everything is still peeling.

    • Lily December 7, 2017 at 3:39 pm - Reply

      So sorry you’re having troubles! It’s possible the HTV is peeling due to not enough pressure. You may need to increase the pressure and/or use a heat transfer pillow or stacked mouse pads to achieve proper pressure. This blog post goes into more detail about pressure. If these suggestions don’t work, then unfortunately the adhesive on your material has most likely degraded from the moisture and heat when stored.

  7. X December 7, 2017 at 5:51 pm - Reply

    I have a good press pillow I always use. Thanks

  8. Betty June 22, 2018 at 9:04 pm - Reply

    HI Lily. I have a friend that needs a sign for her business. It’ll be approx 4′ X 8′ and she wants it on grommeted canvas. How long can I expect HTV to last in the Texas heat? Is there a better vinyl to use?

    • Lily June 25, 2018 at 11:23 am - Reply

      Hi Betty! Do you know what the fabric content of the canvas is? Without knowing, it’s hard to say which HTV would be best. Although you’ll definitely want to use EasyWeed® Extra if the fabric contains nylon. However, if the banner is made from a plastic material you’ll need to use EasyPSV™ Permanent.

  9. Tiffany October 3, 2018 at 7:51 am - Reply

    Hi Lily! If the vinyl has been exposed to the sun, is the something I can do to help it weed easier. It’s really sticky and very difficult to weed.

    • Lily October 4, 2018 at 9:22 am - Reply

      Hi Tiffany! I’m sorry, but it sounds like your vinyl may have been negatively affected by the sun exposure. You can try the heat press weeding trick if it feels like the adhesive is too aggressive. But it’s possible you may need to begin again with new HTV.

  10. Steven January 12, 2019 at 2:38 pm - Reply

    I have my workspace set up in my garage where I also store my vinyl. I live in Oregon where it’s not overly hot or cold for long. It’s more wet than anything. My garage is insulated but not climate controlled. Should I worry about storing my vinyl in the garage?

    • Lily January 14, 2019 at 2:09 pm - Reply

      Hi Steven! The wet weather conditions can also affect the material. The dampness can shorten the shelf life and can cause yellowing of the material and separation of the material from the carrier mask. Ideal storage is in a climate controlled environment. We recommend 50% humidity or less for greatest longevity.

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