Commercial Kitchen Food-Grade Polymer Selection: PP, POM, PTFE, PEEK and PPSU by Application

Food-grade polymers in commercial kitchen equipment are not a generic "plastic" — they are a material engineered for a specific temperature, a specific wear, a specific chemical, and a specific food contact. PP (polypropylene) handles impact and food contact for cutting boards; POM (acetal) handles wear and dimension for guides; PTFE (Teflon) handles non-stick and chemical for seals; PEEK handles high temperature and wear for specialty parts; PPSU handles high heat and impact for steam applications. A polymer that is right for a cutting board will fail in a high-temp seal; a polymer that is right for a seal may not be food-contact compliant. This article compares the five polymers, maps each to the kitchen application where it fits, and references FDA 21 CFR 178 compliance.

Commercial Kitchen Food-Grade Polymer Selection: PP, POM, PTFE, PEEK and PPSU by Application(pic1)

The scope covers food-grade polymer selection for commercial kitchen contact parts. It covers polymer types, temperature, wear, chemical resistance, and FDA compliance. It does not cover stainless grade selection (covered in CK-01), gasket elastomers (covered in CK-P0-10), or heat source. A compliant commercial kitchen equipment solution specifies polymer by application, not a single polymer for the whole kitchen.

Five Polymers and Their Properties

The five polymers differ in temperature range, impact, wear, chemical resistance, and food-contact compliance. The differences drive which polymer goes where.

Polymer	Temp range (°C)	Impact	Wear	Chemical	Food contact (FDA)	Relative cost
PP (polypropylene)	0 to +100	Excellent	Low	Good (acid, base)	Yes — 21 CFR 178.1520	Low
POM (acetal, Delrin)	-40 to +120	Good	Excellent	Good (mild)	Yes — 21 CFR 178.3720	Medium
PTFE (Teflon)	-200 to +260	Low	Low (creeps)	Excellent (all)	Yes — 21 CFR 177.1550	Medium-high
PEEK	-40 to +250	Good	Excellent	Excellent	Yes — specific grades	High
PPSU (Radel)	-100 to +180	Excellent	Good	Excellent	Yes — specific grades	High

Temperature is the key number — a PEEK part at 240°C cannot use PP (limit 100°C); a steam part at 170°C cannot use POM (limit 120°C). FDA compliance is non-negotiable for any polymer that touches food. FDA 21 CFR 178 (indirect food additives: polymers) lists the approved polymers and their extraction limits; 21 CFR 177 covers specific resin grades.

Application-by-Polymer Map

The table below maps kitchen applications to the appropriate polymer, based on the temperature, the wear, the chemical exposure, and the food contact.

Application	Conditions	Recommended polymer	Rationale
Cutting board	Food contact, knife impact, mild chemical	PP or HDPE	PP handles impact; HDPE also common; both FDA compliant
Guide / wear strip	Sliding contact, wear, intermittent food	POM	POM handles wear and dimension; FDA compliant
Non-stick seal / gasket	Food contact, non-stick, chemical	PTFE	PTFE handles temp and chemical; non-stick; creeps under load
High-temp specialty	Food contact, high temp, wear	PEEK	PEEK handles 250°C + wear; specialty only; cost
Steam tray / ｉｎｓｅｒｔ	Steam at 130–170°C, impact, food	PPSU	PPSU handles steam + impact; FDA compliant
Handle / knob	Hand contact, intermittent food, mild chemical	POM or PP	POM for wear; PP for impact; both FDA
Scraper / blade	Food contact, edge wear, mild chemical	POM or PTFE	POM for edge; PTFE for non-stick

Material note: The application-by-polymer map is a starting point, not a universal spec. Local regulation, specific food chemistry, and cleaning concentration may shift the boundary. A polymer in a steam kitchen may need PPSU where a dry kitchen uses POM. Document the polymer per application in the equipment specification.

FDA Compliance and Documentation

FDA 21 CFR 178 lists approved indirect food additives for polymers; 21 CFR 177 lists specific resin grades. A polymer that touches food must comply with the applicable section. The compliance must be documented — a polymer without a compliance certificate is not food-grade, regardless of the resin name.

Commercial Kitchen Food-Grade Polymer Selection: PP, POM, PTFE, PEEK and PPSU by Application(pic2)

Polymer	FDA section	Food types	Temp limit
PP	21 CFR 178.1520	All food types	Up to 100°C (sustained)
POM	21 CFR 178.3720	All food types (specific grades)	Up to 120°C
PTFE	21 CFR 177.1550	All food types	Up to 260°C (sustained)
PEEK	Specific grades only	Food contact grades	Up to 250°C
PPSU	Specific grades only	Food contact grades	Up to 180°C

The double-tank vegetable washing machine may use PP for the basket (impact, water, food contact) and POM for the slide guides (wear, dimension). The polymer specification must list the resin grade, the FDA section, and the food types — a generic "plastic" specification is not defensible.

Scope, Sources and Limitations

Scope. This article covers food-grade polymer selection for commercial kitchen contact parts. It covers polymer types, temperature, wear, chemical resistance, and FDA compliance. It does not cover stainless grade selection, gasket elastomers, or heat source.

Limitations. All polymer properties and FDA references are drawn from publicly available material engineering and food-safety material. Actual polymer selection depends on local regulation, specific food chemistry, cleaning protocol, and equipment design. HSYL does not publish project-specific polymer specifications without verified evidence.

Source basis. Polymer properties are consistent with ASTM material specs, FDA 21 CFR 178 (polymers), FDA 21 CFR 177 (specific resins), and EU 1935/2004 (food-contact materials).

Food-Grade Polymer Resources

Three resources complement this polymer content. The kitchen solutions page carries the full scope. The vegetable washing machine page carries a polymer-basket and guide example. The gasket and seal selection article (CK-P0-10) carries the elastomer (rubber) specification, which is distinct from rigid polymer.

Commercial kitchen equipment solution — the full kitchen scope where polymer-by-application specification applies.
Double-tank vegetable washing machine — an equipment with polymer basket and slide guides.
Commercial kitchen gasket and seal selection (CK-P0-10) — the elastomer (rubber) specification, distinct from rigid polymer.

Next Step: Map Your Kitchen Polymers

Send HSYL your equipment list, polymer contact parts, temperature range, food types, and cleaning chemical. HSYL will return a pre-filled application-by-polymer map with FDA references for your parts and a polymer specification template for your equipment.

Frequently Asked Questions

Which polymer is best for a commercial kitchen cutting board?

PP (polypropylene) or HDPE (high-density polyethylene). Both handle knife impact, are FDA-compliant for food contact (21 CFR 178.1520 for PP), and clean easily. PP is more common for cutting boards because it is tougher and resists cracking. Both have a temp limit around 100°C — they are not for steam or hot surfaces.

What is the difference between PTFE and PEEK for kitchen applications?

PTFE (Teflon) is non-stick, handles -200 to +260°C, but is soft and creeps under load. PEEK is strong, handles -40 to +250°C, wears excellently, but is much more expensive. PTFE is for non-stick seals and gaskets; PEEK is for high-temp wear parts where PTFE would fail under load. PEEK is specialty, used only where cost is justified.

Is POM food-contact compliant for commercial kitchen guides?

Yes, specific grades of POM (acetal, Delrin) are FDA compliant per 21 CFR 178.3720 for repeated food contact. POM is excellent for guides and wear strips because it handles sliding wear and dimensional stability. The food-contact grade must be specified and documented — not all POM grades are food-contact.

What polymer is used for steam trays in commercial kitchens?

PPSU (Radel) or specific grades of PPS (polyphenylene sulfide). PPSU handles steam at 130–170°C, has excellent impact, and is FDA compliant for food contact. PPS is also used for high-temp steam. PP cannot be used (temp limit 100°C); POM cannot be used (temp limit 120°C). The polymer must be rated for sustained steam temperature.

Can HSYL specify the polymer for every contact part in my kitchen equipment?

No. Polymer selection depends on local regulation, food chemistry, cleaning protocol, temperature, and wear. HSYL specifies equipment capability (polymer options, FDA grades) and supports commissioning, but the polymer specification per part must be established by your kitchen engineering and food-safety authority against the applicable FDA section and food-contact regulation.

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