Dissolvable Cement-Additive Bags

Pre-dose. Seal. Drop the sealed bag straight into the mixer — it dissolves completely, leaving zero plastic behind. Zeropac's dissolvable cement-additive bag lets batching plants and construction crews pre-measure the exact additive dose into a strong PVOH flat bag, seal it, and throw the whole unopened bag into the running concrete mixer. The bag dissolves at 40°C as the mixer turns, releasing the additive evenly with no residue, no microplastics and no worker contact with chemicals.

PVOH film is around three times stronger than standard LDPE plastic, so bags stay intact through storage and transport, yet dissolve cleanly once they hit warm water in the mixer. Held in our Sydney warehouse for fast Australian delivery.

Dissolvable PVOH cement additive bag dropped into a concrete mixer, dissolving with zero plastic residue

How It Works

  1. Pre-dose the exact amount. Fill the 530 x 350mm bag with the precise additive dose for one mixer batch — no scooping or eyeballing at the mixer.
  2. Seal and store. Fold-close or heat-seal the bag. The strong PVOH film is stable in normal storage with a five-year shelf life, so you can pre-fill in bulk ahead of time.
  3. Drop it in the running mixer. Add cement and water as usual, then drop the sealed bag straight in. You never open it.
  4. Nothing to handle, nothing left. The bag dissolves within standard mixing time, releasing the additive evenly. No plastic waste, no residue, no microplastics.
Dissolvable bag dissolving inside a running concrete mixer and releasing cement additive into the mix

Three Ways It Improves Site Operations

Protect your crew

Workers never open containers, scoop powder or breathe dust. Additives stay sealed until they dissolve inside the mixer — less chemical contact and lower WHS risk at the point of use.

Stop waste & dosing errors

Each bag holds the same pre-measured dose, so every batch is consistent. No spills from torn paper bags, no over- or under-dosing, and fewer batches failing spec.

Speed up mixing

Add cement, add water, drop in the sealed bag — the mixer does the rest. No opening, measuring or cleaning up spills between batches.

At a Glance

Specification Details
Material PVOH film — around 3× the strength of standard LDPE
Bag size 530 x 350mm — single-batch additive dose
Dissolves at 40°C in warm water inside the mixer
Closure Heat seal or fold closure
Shelf life 5 years+ stored cool and dry
Carton quantity 500 bags per carton
Residue None — no microplastics, marine safe
Delivery Fast dispatch from our Sydney warehouse
Close-up of a sealed dissolvable PVOH cement additive bag showing strong film and secure closure Pre-filled dissolvable cement additive bags organised in a crate ready for the construction site

Who It's For

  • Concrete batching plants — pre-dosed admixtures (accelerators, retarders, plasticisers, water reducers) for consistent high-volume batching.
  • Construction sites — on-site mixer dosing without chemical-handling equipment, ideal for remote pours where measuring gear isn't available.
  • Pre-mix & ready-mix manufacturers — standardised additive dosing across production runs and plastic-free additive packaging as part of sustainability programs.

Watch It In Action

Video coming soon — see the pre-dosed bag dropped into the mixer and dissolve, leaving nothing behind.

Frequently Asked Questions

Does the bag dissolve fully inside the concrete mixer?

Yes. The bag dissolves completely at 40°C during the mixing cycle, releasing the additive evenly. No plastic film remains in the finished mix, and PVOH leaves no residue and no microplastics.

Do the bags work in cold-weather mixing?

The bag needs water above 40°C to dissolve. During mixing, the mechanical action and heat generated typically reach this temperature, so the bag dissolves within standard mixing time regardless of ambient conditions. For very cold pours, contact our Sydney team to confirm the best approach for your mix.

Which additives can I put in the bags?

The bags suit powdered and granular additives including plasticisers, accelerators, retarders and air-entraining agents. The PVOH film provides a moisture barrier in storage and dissolves reliably during mixing. For liquid additives, contact Zeropac to discuss compatibility.

Will the bags dissolve in storage or from rain on site?

No. The film only dissolves in sustained warm water above 40°C. Ambient humidity and rain won't break it down. Keep pre-filled bags in dry storage away from standing water. Stored cool and dry, unfilled bags have a shelf life of five years or more.

How do I fill and seal the bags?

Fill using your existing additive-handling equipment, then fold-close or heat-seal the open end. Use an impulse or continuous heat sealer set lower than for polyethylene. Most operations pre-fill in batches ahead of time. Contact Zeropac for sealing guidance.

Switch to safer, plastic-free additive dosing

Request a free sample to test the bags with your own additives and mixing equipment. Our Sydney team can talk through dosing, sealing and volume pricing. Call (02) 9161 1633 or order online.

Shop the Dissolvable Cement-Additive Bag

Want the full detail? Read the complete guide  ·  Related: Dissolvable Bin Liners  ·  Flat Bags & Carton Liners