What we publish

The five-point scale

On this page13

What the ratings are The two on this shelf The interesting number is glass at 1 And polypropylene at 4 for chemistry Per material class, not per product Which is the limit to understand So a 4 out of 5 is a starting point Use it to eliminate, not to select Clarity is rated 5 for both Ten material classes are rated in all And none of the five attributes is a barrier property And nothing in the scale addresses sterility References

Chemical Resistance 5 of 5 for glass, 4 for polypropylene. That is all we say.

What the ratings are

Five attributes on a five-point scale, published per material class: Chemical Resistance, Clarity, Impact Resistance, Rigidity and Scratch Resistance. Ten material classes are rated.

The two on this shelf

Glass is Chemical Resistance 5, Clarity 5, Rigidity 5, Scratch Resistance 5 and Impact Resistance 1. Polypropylene is Chemical Resistance 4, Clarity 5, Rigidity 5, Scratch Resistance 5 and Impact Resistance 4.

The interesting number is glass at 1

Impact Resistance 1 of 5, which is the only low rating in either set. Glass is the inert choice and the breakable one, and the scale says so.

And polypropylene at 4 for chemistry

Good rather than high. Which is accurate and is not a statement about any particular drug.

Per material class, not per product

The rating attaches to PP or to Glass, not to a specific jar. Two polypropylene jars from different molders have the same published rating.

Which is the limit to understand

A resin family rating cannot distinguish additives, colorants, mold release or regrind content, and those are exactly where leachables come from.

So a 4 out of 5 is a starting point

It says polypropylene is generally resistant. It does not say your formulation will not sorb into it, which is the absorptive question.

Use it to eliminate, not to select

A material rated low for the property you care about is out. A material rated high is a candidate for a study.

Clarity is rated 5 for both

Which is useful for a different reason: a compounded preparation often needs to be inspected, and 26 of the 106 containers here are clear.

Ten material classes are rated in all

Which covers the catalog rather than this shelf, and only two of them turn up here. A property on a different shelf has more materials to weigh and the same five attributes to weigh them on.

And none of the five attributes is a barrier property

No oxygen or moisture transmission figure, which for a preparation with a shelf life is the number a packaging engineer would reach for first. We publish the liner instead and leave the barrier question open.

And nothing in the scale addresses sterility

Which is paragraph (c) and is its own page. No rating substitutes for a sterile container.

References

The Davis Pack Supply catalog, measured 19 October 2026. Our published material properties are a five-point rating on five attributes, per material class rather than per product: Chemical Resistance, Clarity, Impact Resistance, Rigidity and Scratch Resistance. For the two materials on this shelf, glass is rated Chemical Resistance 5 of 5, Clarity 5, Rigidity 5, Scratch Resistance 5 and Impact Resistance 1; polypropylene is rated Chemical Resistance 4, Clarity 5, Rigidity 5, Scratch Resistance 5 and Impact Resistance 4. Ten material classes are rated in total. These are a screening tool on a resin family and not a compatibility finding for a formulation.

The Davis Pack Supply catalog, measured 19 October 2026. 486 rows: 106 containers and 380 closures, which are the same rows the cannabis topicals group returns. 15 to 237 mL with a median of 118. 60 PP and 46 glass. 84 jars, 17 bottles, 4 tubs and pails, 1 tube. 28 white, 26 clear, 17 natural, 13 black, 12 amber, 6 blue, 4 frosted. Necks: 18 at 70-400, 16 at 89-400, 14 each at 58-400 and 53-400, 8 at 18DIN, 7 at 43-400, 5 unrecorded. Liners on the closures: 119 heat induction seal, 51 F217, 47 pressure sensitive, 33 No Liner, 32 Plastis standard, 30 unrecorded, 27 foam, 25 PE foam, 10 Plastis pasteur, 3 polycone.

Written from 21 CFR 211.94 and from the catalog as it stood on 19 October 2026. Part 211 is current good manufacturing practice for finished pharmaceuticals; compounding under section 503A of the Federal Food, Drug, and Cosmetic Act carries conditional exemptions from certain requirements including cGMP, and nothing here asserts that 211.94 applies to any particular compounder. Our chemical resistance figures are a five-point rating on a resin family, not a compatibility finding for a formulation. No container in this catalog is supplied sterile or depyrogenated, and we publish no extractables data and no certificate of analysis.