GBL (gamma-Butyrolactone) and 1,4-BDO (1,4-Butanediol) are under the legislative microscope again, as the UK government seeks to toughen up rules on their availability and use. Trade bodies including the UK Chemical Business Association and the British Coatings Federation have been formally involved in the consultation process, which is due to close on 11 November.
Currently, under Regulation 4B of the Misuse of Drugs Regulations 2001, UK businesses can import pure GBL and 1,4-BDO for industrial use without a controlled drug licence. The problem is that under Regulation B, the burden of proof falls to the authorities. This loophole has been exploited by criminals, who use the chemicals in spiking-related crimes and drug abuse. GBL and 1,4-BDO metabolise into GHB when ingested, which depresses the nervous system, causing amnesia and unconsciousness, which is why they pose a recognised public health threat.
Whilst the government has resisted calls to reclassify the chemicals as Class A, having already moved them from a C to B classification in 2022, significant changes are still likely. The proposals being considered include the removal of the blanket exemption on industrial use, the introduction of Schedule 1 licensing and set concentration thresholds (of either 70% or 99%).
There is also the possibility of including product-based exemptions for specific, finished formulations that are above the 70% threshold. This is a system used in the US, which, if applied in the UK, could help minimise the regulatory impact on some legitimate industrial products.
A concentration threshold of 70% would exempt the majority of existing coating and printing ink formulations that do contain GBL. Businesses that fall outside these percentage exemptions may now review solvent intensity or consider using alternatives. This shift to a system where only diluted mixtures (below specific percentage thresholds) escape strict drug licensing poses operational issues for businesses that currently use these chemicals.
One of the key questions is how record-keeping and loss reporting would work in practice. Volume discrepancies that happen from industrial operations such as sampling, cleaning, and liquid transfers may be difficult to reconcile for bulk users. This is also why secure containment of these chemicals is so important, as Invopak’s Scott Sandilands explains, “Proper UN-certified containers are designed to safely transport chemicals. In the case of GBLs and licensed chemicals where traceability is a legal requirement, and volumes must be accounted for, it’s vital that packaging is robust and leak-proof.”
The legislative changes will increase the administrative burden on businesses that use these chemicals, and they will face higher costs to ensure compliance as a result. There are also likely to be fluctuations in the price and availability of these chemicals as the market becomes reliant on established, large-scale producers that have the resources to stay viable post-legislation.
The Home Office is scheduled to publish its official response to the consultation by 8th February 2027. The government has given some indication of the shape that legislation will take, so for businesses likely to be affected, the time for contingency planning is now.
