Workers have staged unofficial strikes at a number of industrial sites over pay.
Sources told the PA news agency that the action has affected construction and maintenance work.
The walkouts are the latest in a series of stoppages hitting sectors including the railways, courts and postal services amid growing unrest in the face of the worsening cost-of-living crisis.
An Ineos spokesperson at the Grangemouth site in central Scotland said: “We can confirm that a number of contractors employed by third parties are taking unofficial industrial action at the Ineos Grangemouth site as part of a nationwide protest event.
“Our manufacturing and fuel distribution operations are unaffected.
“The site has a very good working relationship with the contracting companies and their employees at Grangemouth, including those operating under the NAECI [National Agreement for the Engineering Construction Industry] agreement.
“We are disappointed that the protesters have chosen to use the Ineos Grangemouth site as one of their backdrops for their unofficial action today.”
The strikers are calling on the Engineering Construction Industry Association (ECIA) to resume talks over an improved pay offer.
Contractors are bound by the "blue book agreement" which sets the terms and conditions of employment for the hourly paid engineering construction workforce.
But workers feel the terms previously agreed by the NAECI have not kept pace with soaring inflation.
In a pamphlet handed out to members of the public, the group said: "Today's action is in response to the ECIA's refusal to recognise the impact of the cost of living crisis.
"We received a 2.5% pay rise in January and will receive 2.5% again in January next year.
"Due to extraordinary events beyond our control, inflation is currently running at 11.8%.
"Many employers have acknowledged these events and have negotiated pay rises and one-off payments.
"Unfortunately, workers covered by the NAECI and those whose pay mirrors the NAECI are expected to get on with it.
"We are asking the ECIA to come back to the negotiating table because of these once in a lifetime events.
"So far, they have point blank refused. We cannot allow this cavalier attitude to continue."
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