What is the difference between Tyvek and Tychem coveralls?

Short answer: Tyvek vs Tychem comes down to the hazard: Tyvek is a breathable, flash-spun polyethylene coverall that excels as a barrier to fine particles such as asbestos, lead dust, mold, and fiberglass plus light liquid splash, while Tychem is a heavier film-coated garment engineered for chemical liquid and vapor protection with taped, liquid-tight seams. Both are DuPont brands. OSHA 29 CFR 1910.132 requires employers to match protective clothing to the assessed hazard. Use Tyvek for dust and particulate work; use Tychem for chemical splash, spray, or immersion.

Tyvek vs Tychem coveralls: particle protection vs chemical protection (2026 Guide)

Tyvek and Tychem look similar on the shelf and share the DuPont name, but they are built to defeat different hazards, and confusing them is a real exposure risk. Tyvek is flash-spun high-density polyethylene — breathable, lightweight, and an excellent barrier to fine particles like asbestos fibers, lead dust, mold spores, fiberglass, and general dust, plus light liquid splash. Tychem is a film-coated, multilayer barrier-film garment engineered for chemical liquids and, in higher grades, vapors, with taped or bound seams for liquid-tight integrity. OSHA 29 CFR 1910.132 makes the employer responsible for assessing the hazard and selecting protective clothing that actually addresses it. Browse the full disposable coveralls range with this distinction in mind.

This guide explains the Tyvek vs Tychem decision the way a procurement or abatement buyer needs it: what each material is, how the grade ladders ascend, the permeation and breakthrough-time concepts that drive chemical-suit selection, why the seam construction differs, and a worked example of choosing between a Tyvek job and a Tychem job. It is not a substitute for the manufacturer's chemical compatibility data — always confirm against the DuPont technical data sheet for your specific chemical. Pair the right coverall with chemical-resistant gloves selected the same way.

Why this matters.
Putting a worker in the wrong coverall is not a comfort issue — it is a breakthrough risk. A Tyvek suit worn against a chemical liquid that the film was never designed to resist will let that chemical permeate and reach skin, and a Tychem suit worn for routine dust work needlessly overheats the worker. OSHA cites employers under 29 CFR 1910.132 when protective clothing is not selected from a documented hazard assessment, and asbestos and lead work carry their own clothing rules under 1926.1101 and 1926.62. Neither Tyvek nor standard Tychem is a flame-resistant garment — a flash-fire hazard requires an FR coverall instead.

Part 1 — What Tyvek and Tychem actually are

Both are DuPont disposable coverall brands, but they are different materials engineered for different jobs. The single most important fact is that Tyvek is a particle barrier and Tychem is a chemical barrier. Everything else — breathability, weight, seams, cost — follows from that one difference.

Tyvek — flash-spun polyethylene particle barrier

Tyvek is made of flash-spun high-density polyethylene fibers bonded into a continuous web. The structure is breathable, so heat and water vapor pass through while fine solid particles do not, which makes it an excellent barrier to asbestos, lead dust, mold spores, fiberglass, and general dust, plus light liquid splash. It is not built for chemical immersion, pressurized jets, or significant chemical liquid exposure. Common grades are Tyvek 400 and Tyvek 500.

Tychem — film-coated chemical barrier

Tychem garments use a coated or laminated barrier film over a substrate, engineered to resist chemical liquids and, in the higher grades, chemical vapors. The film makes the garment far less breathable and considerably heavier than Tyvek, and the seams are taped or bound rather than simply sewn so the suit stays liquid-tight. Tychem is the answer when the hazard is a chemical that would permeate ordinary fabric.

Why the brand overlap causes mistakes

Because both carry the DuPont name and a similar white coverall silhouette, buyers sometimes treat them as interchangeable price points. They are not. A Tyvek suit on a chemical-handling line offers little chemical protection, and a Tychem suit on a dusty abatement job is a heat-stress liability. Match the garment to the hazard, not to the logo.

Part 2 — Primary protection: particles vs chemicals

The defining split is the kind of contaminant each garment is designed to stop. Tyvek stops particulates. Tychem stops chemicals. Holding that line is the core of the selection decision and the reason this comparison exists.

When Tyvek is the right call

Choose Tyvek for dust and particulate hazards: asbestos abatement, lead-paint work, mold remediation, insulation and fiberglass handling, general demolition dust, and light non-hazardous splash. It keeps workers cooler over a full shift, which matters in hot abatement enclosures. Pair it with a disposable respirator for the airborne fraction.

When Tychem is the right call

Choose Tychem when the hazard is a chemical in liquid, spray, jet, or vapor form — acid handling, solvent transfer, hazmat response, and any task where a chemical could contact and permeate the suit. The trade-off is breathability and weight, so the chemical hazard has to justify it. For respiratory protection on the same job, a paint and spray respirator or full mask is usually paired in.

Source: DuPont Tyvek and Tychem technical data sheets; EN 13982 (Type 5) and EN 14605 (Types 3/4). Confirm chemical compatibility per the specific data sheet.

Part 3 — How the Tychem grade ladder ascends

Tychem is not one product but a family that climbs in chemical breakthrough resistance. As the grade number rises, so does the range of chemicals held off and the duration of protection. Selecting a grade is a chemical-by-chemical decision, not a guess.

Tychem 2000 through 10000

The grades roughly ascend Tychem 2000, Tychem 4000, Tychem 6000, and Tychem 10000, with increasing chemical breakthrough resistance at each step. Lower grades suit lighter, shorter-duration splash exposures; higher grades are for aggressive chemicals, longer contact, or vapor-tight ensembles. The store stocks the DuPont Tychem 4000 coverall and the heavier DuPont Tychem 6000 coverall as representative steps on that ladder.

EN Type ratings

Tychem garments typically meet EN Type 3 (liquid-jet tight) and Type 4 (spray tight) and higher, reflecting their taped, liquid-tight construction, whereas Tyvek garments are commonly rated to the particle and light-spray types (EN Type 5 and 6). The EN type is a quick shorthand for how aggressively a liquid the suit is built to repel — confirm the exact classification on each product's data sheet.

Part 4 — Permeation and breakthrough time

For any chemical garment, two concepts decide whether it is adequate: permeation and breakthrough time. They are why you cannot pick a chemical suit by appearance and why a Tyvek coverall, which is not tested for chemical permeation in the same way, cannot stand in for a Tychem one.

What permeation means

Permeation is a chemical passing through the suit material at the molecular level — not through a hole, but through the film itself. A garment can look intact and still be permeated. DuPont publishes permeation data per chemical for each Tychem grade, which is why the technical data sheet, not the brand name, is the authority for chemical selection.

What breakthrough time means

Breakthrough time is how long the material resists a specific chemical before permeation reaches a defined rate. A suit rated for hours against one acid may break through in minutes against a different solvent. Match the garment's breakthrough time to your expected contact duration with a safety margin, and select gloves against the same chemical using the same logic — the weakest link sets the protection. The EN 388 glove standard uses the same permeation-and-breakthrough thinking for hand protection.

Part 5 — Seams and construction

The seam is where many suits fail, and it is a visible tell of what a garment is built for. Tyvek coveralls are often serged (stitched), which is fine for particulates but is not liquid-tight; the needle holes are paths a liquid can follow. Tychem coveralls use taped or bound seams that seal the stitch line so the suit holds its liquid-tight integrity. When a job needs liquid protection, the seam must be sealed — a serged Tyvek seam does not become liquid-tight just because the fabric resists splash.

Part 6 — Flash-fire and FR hazards

A critical limit: neither standard Tyvek nor standard Tychem is flame-resistant. Both are polymer garments that will ignite and melt in a flash fire, so they are the wrong choice where an arc-flash or flammable-vapor flash hazard exists. For those tasks, use a flame-resistant garment such as DuPont Tychem ThermoPro or a 3M 4530 FR disposable coverall, which combines limited flame resistance with chemical splash protection. Do not assume a chemical suit is also a fire suit.

Part 7 — Matching the suit to the job and the ensemble

The coverall is one element of a protective ensemble. A Tyvek abatement job pairs the suit — for example a DuPont Tyvek 400 TY122S hood-and-boots coverall — with a respirator and often a full-face respirator, gloves taped to the cuff, and disposable overboots. A Tychem chemical job pairs the suit with chemical gloves chosen against the same chemical, sealed cuffs and ankles, and frequently a supplied-air or full-face respirator. Whatever the body needs, the hand protection has to be selected to the same hazard standard, because exposed or under-rated gloves defeat the suit.

Part 8 — Worked example: choosing between a Tyvek job and a Tychem job

Here is how the particle-vs-chemical logic drives two real coverall decisions — an asbestos abatement task and a solvent-transfer task — using garments stocked on this site:

1. Write down the actual hazard for each task. Task A is asbestos abatement: the hazard is airborne fiber and settled dust, a particulate hazard. Task B is transferring a chlorinated solvent: the hazard is a chemical liquid that can splash and permeate. One is a particle problem, the other is a chemical problem — that single distinction picks the brand.
2. Select Tyvek for the particulate task. For the abatement job, a DuPont Tyvek 400 TY127S hooded coverall gives breathable particle protection with an integrated hood; a serged seam is acceptable because the hazard is dust, not liquid immersion. A plainer DuPont Tyvek 400 TY120 coverall works where no hood is needed, and a breathable KleenGuard A20 particle coverall is a lower-cost alternative for light dust.
3. Check chemical data, not the brand, for the solvent task. For the solvent transfer, do not reach for Tyvek. Pull the DuPont permeation data for that specific solvent and confirm the breakthrough time on a Tychem grade meets your contact duration. Step the grade up as the chemical gets more aggressive; a liquid-and-particle barrier such as the KleenGuard A40 liquid-particle coverall handles light splash but is not a substitute for a true Tychem chemical suit on significant exposure.
4. Verify the seams match the hazard. Confirm the abatement Tyvek suit's serged seams are fine for dust, and confirm the solvent Tychem suit has taped, liquid-tight seams. If the solvent task involves a pressurized jet, you need at least an EN Type 3 garment — a sprayed-but-not-jet exposure can use Type 4.
5. Build the ensemble and match the gloves. Add respiratory protection for each task and select gloves against the same chemical. Use the chemical-resistant glove guide so the gloves do not break through before the suit does, and cross-reference construction respiratory rules in OSHA 1926.103 when the work is on a job site.
6. Document the selection against the hazard assessment. Record why each garment was chosen so the selection traces back to OSHA 29 CFR 1910.132. For asbestos and lead, cross-check the clothing provisions in 1926.1101 and 1926.62, and for silica work see the OSHA silica standard, which drives both coverall and respirator selection.

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The same particle-vs-chemical rule scales from a single task to a full PPE program. Confirm every chemical choice against the DuPont data sheet, keep an FR option like the 3M 4530 FR coverall on hand for flash-fire tasks, and pair each suit with correctly matched gloves selected to the same hazard standard.

Frequently asked questions

What is the difference between Tyvek and Tychem?

Tyvek is a breathable flash-spun polyethylene coverall built as a barrier to fine particles such as asbestos, lead dust, mold, and fiberglass, plus light liquid splash. Tychem is a heavier film-coated garment engineered for chemical liquid and vapor protection with taped, liquid-tight seams. Both are DuPont brands; choose Tyvek for dust and Tychem for chemicals.

Is Tyvek chemical resistant?

Tyvek resists light liquid splash but is not a chemical-immersion or chemical-permeation garment. It is designed to stop fine particles, not to hold off chemical liquids, jets, or vapors at the molecular level. For genuine chemical protection, use a Tychem grade selected against the DuPont permeation data for your specific chemical.

Can I use a Tyvek suit for chemical work?

Only for incidental, light splash of non-aggressive liquids — never for chemical immersion, pressurized jets, or significant chemical liquid exposure. A chemical that can permeate the film will reach the skin even though the suit looks intact. For real chemical handling, step up to a DuPont Tychem 4000 or higher and confirm breakthrough time.

What does Tychem protect against that Tyvek does not?

Tychem is engineered for chemical liquids and, in higher grades, chemical vapors, with taped liquid-tight seams that hold integrity under spray or jet exposure. Tyvek lacks the barrier film and liquid-tight seam construction, so it does not provide that chemical protection. The trade-off is that Tychem is heavier and far less breathable.

Which Tychem grade do I need?

It depends on the chemical and the contact duration. The grades ascend Tychem 2000, 4000, 6000, and 10000 with increasing breakthrough resistance, so check the DuPont permeation data for your specific chemical and pick a grade whose breakthrough time exceeds your expected contact with a safety margin. The Tychem 6000 covers more aggressive exposures than the 4000.

What is breakthrough time?

Breakthrough time is how long a garment material resists a specific chemical before permeation reaches a defined rate. It is chemical-specific — a suit good for hours against one acid may break through in minutes against a different solvent. Match the suit's breakthrough time to your contact duration, and apply the same logic when choosing chemical-resistant gloves.

What is permeation in protective clothing?

Permeation is a chemical moving through the suit material at the molecular level, not through a visible hole. A garment can appear undamaged and still be permeated, which is why chemical-suit selection relies on the manufacturer's per-chemical permeation data rather than on how the suit looks. DuPont publishes this data for each Tychem grade.

Are Tyvek and Tychem made by the same company?

Yes. Both Tyvek and Tychem are DuPont brands. They share a name and a similar white-coverall appearance, which is exactly why buyers sometimes confuse them, but they are different materials built for opposite hazards — particles versus chemicals.

Which coverall is best for asbestos abatement?

A Tyvek coverall is the standard choice for asbestos work because asbestos is a particulate hazard and Tyvek is a breathable particle barrier. A hooded model such as the DuPont Tyvek 400 TY127S covers the head, and clothing provisions appear in OSHA 1926.1101. Pair it with the correct respirator for the fiber level.

Which coverall is best for mold remediation?

Mold remediation is a spore and dust hazard, so a breathable Tyvek coverall is appropriate and keeps the worker cooler than a chemical suit. Add a disposable respirator rated for the spore load. A Tychem suit would be overkill and a heat-stress risk unless a chemical biocide application changes the hazard.

Is Tyvek or Tychem flame resistant?

Neither standard Tyvek nor standard Tychem is flame-resistant; both are polymer garments that ignite and melt in a flash fire. For a flash-fire or arc-flash hazard, use a flame-resistant garment such as DuPont Tychem ThermoPro or a 3M 4530 FR coverall. Never assume a chemical suit is also a fire suit.

Why do Tychem suits have taped seams?

Tychem seams are taped or bound so the stitch line stays liquid-tight; a plain sewn seam leaves needle holes that a liquid can follow even when the fabric resists splash. Tyvek suits are often serged, which is fine for dust but not liquid-tight. When a job needs liquid protection, the seam construction matters as much as the fabric.

What is the difference between Tyvek 400 and Tyvek 500?

Both are particle-barrier grades; Tyvek 500 generally adds more robust construction and liquid-tight seam options over the standard Tyvek 400 line. For most dust and abatement work the Tyvek 400 line is the common choice. Confirm the specific seam and antistatic options on the product data sheet for your task.

Do I need chemical gloves with a Tychem suit?

Yes. A chemical suit is only as good as the weakest part of the ensemble, so gloves must be selected against the same chemical using the same permeation and breakthrough logic, read the EN 388 ratings, and tape the cuff to the sleeve so there is no gap between glove and suit.

Does OSHA require a specific coverall?

OSHA 29 CFR 1910.132 does not name Tyvek or Tychem; it requires the employer to assess the hazard and select protective clothing that addresses it, then document that selection. Substance-specific rules — asbestos 1926.1101, lead 1926.62 — add clothing provisions. See our OSHA 1910.132 guide for the assessment framework.

Is a Tychem suit reusable?

Tychem and Tyvek coveralls are disposable, single-use garments and should be discarded after exposure rather than laundered and reworn, because permeation and contamination are not reliably removed. Decontaminate before doffing per your site procedure, then bag and dispose of the suit as the contaminant requires.

How do I choose between Tyvek and Tychem quickly?

Ask one question: is the hazard a particle or a chemical liquid? Dust, fiber, spores, and fiberglass mean Tyvek; chemical splash, spray, jet, or immersion means Tychem at a grade matched to the chemical. If a flash-fire hazard is present, neither applies — use an FR coverall. When unsure, confirm against the DuPont data sheet and your hazard assessment.

Further reading on this site

• Disposable coveralls — the full Tyvek, Tychem, and particle-coverall catalog in one place.
• Chemical-resistant gloves — match the gloves to the same chemical as a Tychem suit.
• Disposable respirators — airborne protection to pair with a Tyvek abatement coverall.
• Full-face respirators — face and eye protection for higher-hazard chemical work.
• DuPont Tyvek 400 TY127S hooded coverall — a representative breathable, hooded particle coverall for abatement and dust.
• DuPont Tychem 4000 coverall — an entry point on the Tychem chemical-grade ladder.
• Chemical-resistant glove guide — how to read permeation and breakthrough data for gloves.
• OSHA 1910.132 PPE requirements — the hazard-assessment rule that drives every coverall choice.