Flushable & Dispersible Nonwoven Wipes: The Complete Guide

What 'Flushable' Actually Means

'Flushable' does not simply mean the wipe can physically pass through a toilet. In the nonwovens industry, flushability is a defined technical standard: the wipe must disperse (break apart) in wastewater conditions within a specific time frame, and it must not clog pumps or sewers.

The two major industry standards are the INDA/EDANA Flushability Guidance Document (GD4) and its predecessors (GD3). GD4 sets the technical test methods for assessing whether a wipe can be responsibly labeled flushable. Products that pass GD4 testing can carry a 'flushable' claim; products that do not must not be flushed and should be labeled 'do not flush.'

How Dispersible Fabric Is Made

Standard spunlace fabric is bonded with high-pressure water jets and holds together because the fibers are tightly entangled. Dispersible fabric is made the opposite way — with weaker bonding so the fibers separate when agitated in water.

The most common dispersible technology is wet-laid or air-laid wood pulp combined with a small amount of short-cut synthetic fiber (typically polyester) for strength. The synthetic fibers are short and lightly entangled so that, when the wipe is flushed and agitated, the bonding breaks down and the fibers disperse.

At SunLuner, our L5 Trützschler wet-laid spunlace line is designed specifically for this category, producing dispersible and flushable substrates from wood pulp and short-cut fiber.

Dispersible vs Non-Dispersible: Know the Difference

Flushability Standards and Testing

GD4 testing is a multi-part assessment that includes slosh box disintegration tests, aerobic and anaerobic biodegradation tests, and municipal pump compatibility. Key test methods include:

• Slosh box disintegration (FG 502) — the wipe must disperse in simulated toilet flushing
• Household drain line clearance — must pass through typical plumbing
• Municipal pump test — must not clog wastewater pumps
• Aerobic and anaerobic biodegradation — must break down in wastewater treatment

Compostable vs Flushable

Flushable and compostable are different claims with different standards. Flushable means the wipe disperses in water and biodegrades in wastewater systems (GD4). Compostable means the product breaks down into compost in an industrial composting facility, typically certified to EN 13432 (Europe) or ASTM D6400 (US).

A 100% cellulose product (viscose or wood pulp) can potentially achieve both claims, but each requires its own certification path and testing. Do not conflate them on packaging — misleading environmental claims are an enforcement priority for regulators.

Sustainability Credentials: FSC and Compostability

For eco-positioned flushable or dispersible wipes, two credentials matter most to buyers:

• FSC certification — verifies the wood pulp comes from responsibly managed forests, important for retail and brand customers
• Compostability certification (EN 13432) — verifies the product breaks down in industrial composting

SunLuner holds ISO 9001 and FSC certification, and our 100% viscose and wood-pulp products are positioned for compostable certification paths. If you are pursuing EN 13432 for a flushable or compostable product, we can support the substrate qualification.

What to Ask Your Flushable Substrate Supplier