Your MAP to the world of plastic moldings.
Sixty years of precision injection molding in the heart of America. From a 5-gram drone bracket to a 10-pound industrial housing, we build the part, the mold, and the relationship that holds your supply chain together.
AT-A-GLANCE
Presses on the floor
21 Active
Clamp tonnage range
50-1,000 Ton
Shot capacity
2-75 Oz
Part weight range
5 G-10 Lb
Resin families
9+ Engineering
Quote turnaround
1 Business Day
precision parts
presses
resin families
engineers
responsibility
One contact. One source of responsibility.
From the first sketch to the loading dock, we own every step in-house or through mold makers we've worked with for decades. No finger-pointing. No supplier roulette.
Custom Injection Molding
Short runs and high-volume production using custom molds. Engineering-grade and high-impact resins, including polycarbonate, ABS, acrylic, nylon, and polyester. Thin-wall and close-tolerance molding.
View capabilities → — 02Mold Building & Maintenance
Trusted mold-maker partnerships cultivated over decades. New tooling, repair, refurbishment, and special maintenance. We oversee the build so you don't manage three suppliers for one part.
How we build molds → — 03Rapid Prototyping
Two in-house engineers, Moldflow analysis, and the latest 3D CAD. We salvage parts that have gone end-of-life, convert metal parts to plastic, and redesign for cost, weight, or supply resilience.
Submit a re-engineering request → — 04Assembly & Secondary Operations
Ultrasonic welding, machining, sub-assembly, packaging, collating, and heat sealing. Finished, packaged, and ready to ship — under one purchase order, on your schedule.
Secondary services →Where our parts actually end up.
Aerospace housings. Drone airframe brackets. Munitions components. Medical disposables. Plumbing fittings that have to seal the first time, every time. If it has to work, we've probably made one.
Four checkpoints between your spec
and our shipping dock.
Quality control is not a department here. It's a sequence built into the production floor, starting the minute resin pellets arrive at the dock.
Statistical Process Control [SPC: real-time data on every machine] and Statistical Quality Control [SQC: dimensional integrity of every part run] feed a centralized network that flags variance before parts ship — not after.
Material Inspection
Every shipment of resin is checked for type, grade, and purity at the dock. Substandard material is returned to the supplier the same day.
In-Process Evaluation
Operators inspect every part for shape, color, and dimensional integrity. SPC charts run on every press, every shift.
Pre-Shipping Evaluation
QC technicians sign off before a single carton is sealed. Records and retained samples are kept on every production run, of every mold.
Final Assembly & Secondary Ops
Welding, packaging, sub-assembly — performed in-house or by vetted partners. We take responsibility for the finished good either way.
Twenty-one presses. One source.
Enough range to mold a 5-gram electronics housing on a Newberry 50-ton on Tuesday and a 10-pound industrial cover on a Farrel 1,000-ton on Wednesday. Without leaving Kansas City.
Two companies. One sixty-year
reputation.
Anthony C. Gross
until you're satisfied
Modern Alpha Plastics was formed in 1996 when two of Kansas City's most respected custom molders — Modern Plastics Molding (founded 1965) and Alpha Plastics — merged into a single shop with sixty combined years of precision injection experience.
Today, the company is led by Anthony C. Gross, President and Chief Engineer. Anthony brings the design background of a working engineer and the operating discipline of an owner-operator. Most quotes pass across his desk. Most molds get a second look from him before the first shot. That's not a marketing line — it's how a 21-press shop with a 60-year reputation actually runs.
Employee longevity is the foundation of the floor. Several families are represented here by two generations. The same operator who started a job at 7 a.m. is often the one who signs off the last carton before it ships.
Read the full company history →Have a part? Send the file.
Upload a STEP, IGES, drawing, or even a photo. We'll come back to you
in one business day with a real engineer's read on whether we're the
right shop — and what it'll cost.
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
CAPABILTIES
- Injection Molding
- Mold Building
- Assembly & Secondary
- Engineering & DfM
- Equipment
- Materials
INDUSTRIES
- Drone & UAS
- Legacy OEM Re-engineering
- Metals-to-Plastics
- Aerospace & Aviation
- Medical
- Munitions
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