Chemicals buying guideLast updated October 2026

Expansive Demolition Agent

Silent rock splitting, with no blasting.

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Price level: Budget
Best to buy: Mar–May, Sep–Nov
Top sources

Marble block with a row of drilled holes for splitting

Overview

What it is

Also called non-explosive or soundless cracking agent: a mostly calcium-oxide powder mixed with water and poured into drilled holes. Over roughly 12 to 48 hours it expands with enormous pressure and cracks rock and concrete silently, without vibration, flyrock or blasting permits.

Quarries use it to split blocks and free benches where explosives would damage the stone or aren't permitted. Grades are matched to the ambient temperature.

Composition: Calcium-oxide-based powder + water
Pressure: Very high (often quoted above 100 MPa)
Time to crack: About 12 to 48 hours, by temperature
Holes: About 30 to 50 mm, spaced by rock type
Safety: Blow-out risk: never look into filled holes

Applications

Best used for

Splitting blocksControlled cracks along drilled lines.
Boulder removalNo blasting licence needed.
Demolition near sensitive structuresNo vibration.
Where blasting is restrictedUrban and protected areas.

Origins

Which countries to source from

The producing countries that matter for expansive demolition agent, what each is known for, and a direct link to vendors there.

China Leading source
Volume production
- Broad range of makers
Vendors in China
Turkey
Supply for regional quarries
- Local makers
Vendors in Turkey
India
Supply for granite quarries
- Domestic makers
Vendors in India

Timing

Best time of year to buy

Use in mild weather, or choose the grade for your season: winter and summer formulas react at different speeds.

Jan: normal
Feb: normal
Mar: best time to buy
Apr: best time to buy
May: best time to buy
Jun: normal
Jul: normal
Aug: normal
Sep: best time to buy
Oct: best time to buy
Nov: best time to buy
Dec: normal

Best time to buy Normal Slower or pricier

Hot weather speeds the reaction and raises blow-out risk; cold weather slows it.

Import costs

Tariffs and import duties

Base duties for the main import markets, the extra US surcharge by origin, and the trade remedies to check before you quote a landed price.

HS codes

3824.99Chemical preparations (typical; confirm)

Base import duty (MFN)

United States5% to 6.5%
European Union6.5%
United Kingdom6%

Importing into the US? Add the 2026 origin surcharge

Section 301 rates in force since 24 July 2026, stacked on the MFN rate above.

China+12.5% & 30112.5% Section 301 (2026) plus the legacy China Section 301 duty (25% on most stone and machinery lines), on top of MFN.
Turkey+12.5%Section 301 (2026) adds 12.5% on top of the MFN rate.
India+10%Section 301 (2026) adds 10% on top of the MFN rate.

Classification varies (lime-based products may enter under 2522). Confirm with your broker.

Rates checked October 2026. Indicative rates for planning, not a customs ruling. Duties depend on the exact tariff line, origin, trade agreements and the rules in force on the day of entry. Confirm with a licensed customs broker before you price an order.

Before you order

Buying checklist

1Choose the grade for your temperature range.
2Follow the supplier's hole diameter and spacing chart.
3Keep powder dry; don't mix with warm water.
4Mark holes and keep people clear until cracking finishes.

Price level: Inexpensive per hole compared with blasting permits and damage.

Vendor Network

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Compare verified suppliers, or post an RFQ and let them come to you with quotes.

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Keep reading

Expansive Demolition Agent

What it is

Best used for

Which countries to source from

Best time of year to buy

Tariffs and import duties

Buying checklist

Ready to source expansive demolition agent?

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