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PACT
Aerial view of the bulk storage tank farm, pipe racks carrying material from the tanks to the production building

Manufacturing

How the Adhesive Is Made

The liquid adhesive line in the order it runs: bulk storage, heated reactor, second mixing stage, cooling, then filling. Between the storage tank and the filling head the batch stays in a closed system under computer control — which is the reason one batch resembles the last.

Last updated: 2026-09-18

Storage Tank to Filling Line

Six stages, in sequence. What decides the quality of the finished adhesive is not any one of them but whether the batch is held long enough at each — particularly the dissolving stage, where a batch moved on too early becomes an inconsistency nobody can correct later.

Bulk solvent storage tanks on a bunded concrete base outside the production building, with pipework running to the plant

Stage 1

Raw materials in bulk storage

Solvents and liquid raw materials are held in bulk tanks outside the production hall and drawn from there by pipeline rather than decanted by hand. Drummed materials and dry components are stored separately and issued against the batch they belong to.

Operator at the control panel of a row of heated mixing vessels, each with a direct-drive agitator motor

Stage 2

Charging the heated reactor

Liquid raw material is transferred through the pipework into a heated, agitated reactor. At the same stage the dry components — SBS rubber sheet, hydrocarbon resin and the rest of the solid charge — are weighed to the formulation ratio and added.

Four jacketed stainless steel reaction vessels with charging hatches open and operators working at the line behind them

Stage 3

Heating until the charge is homogeneous

The batch is heated so the solid charge dissolves into the liquid phase, and held under agitation until liquid and solids have become one homogeneous mass. This is the stage that decides whether the finished adhesive is consistent or grainy.

Row of stainless steel mixing vessels with numbered identification marks, each driven by its own motor and control box

Stage 4

Second heated mixing stage

The batch is transferred to a mixing vessel for a second heated mixing stage, where the remaining components are worked in and the batch is brought to its final composition.

Stainless steel process pipework and valve manifolds connecting vessels on an upper platform of the plant

Stage 5

Cooling to room temperature

Mixing finishes and the batch is cooled to room temperature. Once cooled it is finished adhesive, and it stays inside the closed system until it reaches a filling head.

Aerosol cans of PACT spray adhesive on the turntable of an automatic filling and crimping machine

Stage 6

Pipeline transfer to the filling lines

Finished adhesive is pumped through pipework to the filling lines — aerosol cans, tins and pails, or cartridges — where it is filled, capped and packed.

Automatic Up to the Filling Head

Transfer, heating, dissolving, mixing and cooling run under computer control, and the batch is not opened to the room between the tank farm and the filling line. Two things follow, and they are the two a buyer changing supplier actually worries about: the batch that arrives next quarter was made to the same recipe and the same thermal profile as this one, and nobody is carrying solvent around in open containers to produce it.

What automation does not do is check itself. Raw material still varies between deliveries, a heating stage can be cut short, and a filling head can drift. That is what the checks on our quality control page are for.

Production hall with jacketed vessels on a raised steel platform and a caution sign at the stairway
The liquid adhesive hall — vessels on the platform, pipework below.
Filled PACT adhesive tins moving along the turntable of a capping machine towards the packing station
Tins reaching the capping station — where people rejoin the process.

Materials In, Packed Goods Out

Solvent-borne products are stored and handled as the flammable liquids they are, which also decides how they can be shipped. See packaging formats for what each product travels in, and storage and shelf life for what happens to adhesive stored badly once it reaches you.

Palletised steel drums of raw material stacked two high in the materials store, each pallet carrying a label
Raw material store — drummed materials issued against the batch that uses them.
Packaging store with flat-packed cartons and bagged materials stacked by type along marked aisles
Packaging store — cartons and pack materials ahead of the packing line.

Frequently Asked Questions

Which parts of the process are automated?
Everything from raw material transfer through heating, mixing and cooling runs under computer control, and the batch stays in a closed system between the storage tank and the filling head. Filling, capping, labelling and packing are where people work on the line, together with charging the dry components and the checks at each stage. Automation up to the filling head is what makes one batch resemble the last one; it does not remove the need for the checks described on our quality control page.
Why does it matter that the dry materials are weighed separately?
Because the ratio of solids to liquid sets viscosity, solids content and ultimately how the adhesive behaves on your line. SBS rubber sheet and hydrocarbon resin are charged against the formulation for that batch rather than estimated, and the batch is then held at temperature until the charge has fully dissolved. A batch filled before it is homogeneous shows up later as inconsistent viscosity or grain in the film.
Can I see the line before I place an order?
Ask. A video walkthrough of the plant can be arranged without much notice, and factory visits are normal in this industry — tell us which part of the process you need to see. If you are evaluating us against another supplier, the more useful request is usually to watch the specific line that would run your product rather than take a general tour.
Do you make every product on this line?
No. The line described here is the liquid adhesive plant. Aerosol filling and sealant cartridge filling run as separate lines, and each product page states the formats that grade is supplied in. Where a requirement falls outside what these lines produce, we say so rather than quote it — the selection guide marks what is listed, what we assess on request, and what is not in our catalogue at all.

From the line to your order

Want to See the Line That Would Run Your Product?

Tell us the product and volume you are considering, and what you need to verify. A video walkthrough of the relevant line can be arranged, and visits are welcome.

Ask about productionHow quality is checked