Find Non-Sticky Water-Resistant Wax for Sealing Letters

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Discussion Overview

The discussion revolves around finding a non-sticky, water-resistant wax suitable for sealing letters and food-related items. Participants explore various types of wax, their properties, and potential issues related to their use, including stickiness and staining.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • The original poster (OP) specifies the desired properties of the wax, including hardness, brittleness, melting point, non-stickiness, and water resistance.
  • One participant suggests highly crystalline paraffin wax as a potential option available in craft stores.
  • Concerns are raised about paraffin wax potentially leaving greasy stains on paper, with some participants agreeing that a highly crystalline wax would minimize this issue.
  • Another participant recalls a personal experience where paraffin wax did not adhere well to paper, suggesting that higher crystallinity might reduce adhesion further.
  • A participant discusses the complexities of peel strength and how the porous nature of paper may affect the adhesion of molten wax, mentioning that adding low modulus materials like beeswax could enhance peel strength.
  • The OP expresses a need for the wax to be natural and non-poisonous for food-related applications, while also noting the importance of the wax being brittle for easy breaking of seals.
  • The OP raises concerns about the flammability of shellac when considering it as an additive to beeswax to increase hardness.
  • There is ongoing uncertainty regarding whether the sealing wax will leave stains on paper or bottles.

Areas of Agreement / Disagreement

Participants express various concerns and suggestions regarding the properties of different waxes, but there is no consensus on a specific solution or agreement on the best approach to achieve the desired sealing wax characteristics.

Contextual Notes

The discussion highlights the need for further exploration of wax properties, including the effects of additives and the implications of using different types of wax for sealing applications.

homechemist
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I need to find out this kind of wax:

-it's solid hard in room temperature (it needs a knife to be cut), but also brittle
-it's melting in above 100C (212F) when heated
-it doesn't have sticky surface
-it needs to be water-resistant

So mainly this would be for sealing wax that can be used for sealing letters.
I think beewax is too sticky and soft for this.
 
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You should look at highly crystalline paraffin wax. The craft stores have these in the candlemaking supplies.
 
I wonder if paraffin wax will not leave greasy stains on the paper.
 
Last edited:
Borek said:
I wonder if paraffin wax will not leave greasy stains on the paper.

Good point. A highly crystalline wax would minimize that. Softer waxes of lower crystallinity would definitely leave those stains.
 
Other question is, if the paraffin will stick hard enough to the paper. I have just rememberd - I have tried to seal letters with candle paraffin as a kid, and paraffin was easily separating from the paper. My bet is that being highly crystalline will make affinity even lower.
 
Paper is porous. The molten wax will penetrate the paper somewhat. Peel strength or the energy to delaminate the paper from the hardened wax is a more complex phenomenon. Usually the addition of a low modulus material like beeswax will help with that. Compounds like rosin are often added in pressure sensitive adhesives to increase peel strength, for example. It has to do with the rheology of the deforming adhesive at the crack tip...
 
Thank you for answers.
I have to also mentions that I would use this also for sealing food related stuff (like bottles, jars), so it's better if wax (+additives) will be natural and non-poisonous.

It's also important that wax is solid, but brittle in room temparature, so wax seal can be broken easily without any solvents.

Resin and shellac are hard solid materials in room temperature. If I add them to beeswax, it will become harder as wax. I'm just concerned about because shellac is flammable.

Also I'm wondering if this sealing wax will leave stains to paper or bottles.
 

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