If you work in conservation-restoration, Paraloid B-72 is probably the consolidant you've handled most often.
In this guide, we review what it is exactly, how it's prepared, and in which situations it's best to choose it over other options.
What is Paraloid B-72?
Paraloid B-72 is an acrylic copolymer made of ethyl methacrylate (70%) and methyl acrylate (30%). It comes as translucent granules or beads that dissolve in organic solvents to create consolidant or adhesive solutions.
Properties that make it essential
- Long-term chemical stability: It does not yellow or become brittle over time. Accelerated aging studies confirm its stable behavior for decades.
- Total reversibility: It dissolves easily in acetone, ethanol, or mixtures of both, allowing the treatment to be removed without damaging the original.
- Water-free: Unlike water-based dispersant consolidants, B-72 in solvent does not introduce moisture to the substrate, which is critical when working on easel paintings or hygroscopic supports.
Typical Concentrations
| Concentration | Typical use |
|---|---|
| 2–3% | Light surface consolidation, fixative |
| 5% | Standard consolidation of paint layers |
| 10% | Very porous or highly degraded materials |
| 15–30% | Adhesive for archaeological fragments |
Recommended Solvents
- Acetone: Dissolves B-72 quickly. High volatility, use with adequate ventilation.
- Ethanol: Slower, longer working time.
- Acetone/ethanol mixture (1:1): Balance between speed and working time. Widely used in laboratories.
When to choose Paraloid B-72 over other options
B-72 is the first choice when the substrate cannot tolerate water and maximum reversibility is needed. When the substrate is damp or does not accept organic solvents, alternatives such as Lascaux 498-HV or Primal AC-33 may be more suitable.
At Innovart, we have it available in different formats. If you have questions about the appropriate concentration for your case, write to us at info@innovart.art.