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Tell us what it has to do.
We’ll tell you what to mold it from.

Material selection is one of the first conversations we have on every project. Bring us a finished spec or a rough idea — we'll guide the resin choice based on load, environment, regulatory needs, and cost.

01Resin families

Nine families. Hundreds of grades.

We process all major commodity and engineering resins. The table below covers the families we run regularly. Specific grades — flame-retardant, UV-stabilized, food-contact, medical-grade — are matched to your part during the quote process.

If your spec calls for something not on this list — PEEK, LCP, TPU, TPE — ask. We've run most of them at one point or another.

02Material selection

How we help you pick the right one.

You don't need to bring us a finalized resin spec. You need to bring us a part that has to work in a specific environment, under a specific load, at a specific cost.

Our two in-house engineers will:

Review your part geometry and target application
Identify the load case, thermal envelope, and chemical exposure
Flag any regulatory requirements (FDA, NSF, UL, ASTM, MIL-spec)
Recommend two or three resin candidates with trade-offs
Run Moldflow analysis on the leading candidate before tooling is committed
Pull on the technical services teams of our resin suppliers when a complex spec calls for it

Five questions we'll ask you

01

What does it have to do?

Structural? Cosmetic? Wear surface? Container?

02

Where will it live?

Indoors, outdoors, under hood, in a body, in space?

03

What does it touch?

Food, blood, fuel, solvents, skin, sterilizer?

04

What load?

Static, cyclic, impact, thermal? At what temperature?

05

What's the budget?

Material cost is often the biggest lever in piece price.

03Special cases

Resin questions worth asking.

— GLASS FILL

13% to 33% glass-filled nylon

The fastest path to a stiffer, stronger, dimensionally-stable part without going to a higher-cost engineering resin. Common in drone airframes, automotive replacement parts, and structural brackets.

— REGRIND

Recycled and regrind compatibility

If your application allows for regrind in the feedstock, we can often deliver a 5–15% material cost reduction. We'll discuss whether your part qualifies.

— FDA / NSF

Food-contact and potable water

FDA-compliant grades for food, NSF/ANSI 51 and 61 for water contact. Documentation chain on every batch.

— FLAME RET.

Flame-retardant grades

UL 94 V-0 grades for electronics, defense, and aerospace housings. Not all flame-retardant grades are created equal — we'll match the exact UL listing your end customer requires.

Not sure what to mold it from?

Send us the part requirement, not the resin spec. We'll figure out the rest.

Engineer-led custom injection molding in the heart of America. Since 1965.

7200 NE Birmingham Rd.

Randolph, MO 64161

816.796.3800 · fax 816.796.8555

Anthony@modernalphaplastics.com

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