What Is PHR in Resin Formulation?

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If you are working with resins, you may have come across the term PHR, especially when adding colours or special effects. But what exactly does PHR mean in this context?

Understanding PHR: Per Hundred Resin

PHR stands for “per hundred resin” and refers to the quantity of an additive to be used for every 100 parts of base resin, measured by weight. This system standardises recipes regardless of total batch size, making it easier to scale your projects or reproduce consistent results. For example, if a pigment recommends 5 PHR and you are working with 200g of resin, you would add 10g of pigment.

How to Measure Ingredients Accurately

Accurate measurement is essential when working with PHR calculations. Using a graduated measuring tool such as the 2L Graduated Measuring Cup for Resin helps ensure you use the correct weight-based ratios. Always measure additives separately and double-check your calculations before combining with the base resin.

Choosing Additives: Pigments and Effects

Many resin colouring and effect products provide recommended dosages in PHR. Mica-based pigments, such as Iridron Pearline Pigments, or transparent dyes like Magic Crystal Transparent Resin Colour, give you the flexibility to achieve creative finishes. Always follow supplier guidance on PHR to balance vividness and clarity in your resin projects.

When This Matters

Understanding PHR is particularly important for anyone seeking repeatable outcomes, such as artists, hobbyists or small-scale manufacturers aiming for batch consistency. It’s a straightforward way to refine your process as you experiment with different resin techniques.

Related guides

What Does Phr Mean In Per Hundred Resin

Getting to grips with PHR unlocks creative control and precision in resin work. For more detail about resin formulation and related techniques, visit our main guide on what does PHR mean in per hundred resin.