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Plastics Companies in Southampton: 53 Active Firms (2026)
Rubber and plastics manufacturers make moulded, extruded and fabricated polymer components in Southampton's metropolitan supply base.
Buying usually sits with operations, procurement, engineering and quality teams rather than a software-style budget owner. Demand comes from industrial, construction, marine, packaging and consumer supply chains, with customers looking for repeatable production rather than speculative development work. Engagements tend to move from material selection, tooling and sample runs into scheduled component supply, backed by production planning, quality control and logistics. Technical sales still matters: buyers need drawings interpreted, tolerances agreed and substitution risks explained before a contract becomes a recurring manufacturing relationship.
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Southampton has 53 actively trading rubber and plastics manufacturers in this list, making the local cohort compact and operationally weighted. Reported employment totals 759 people, so the footprint is visible but still concentrated in relatively small production businesses rather than large corporate estates. The presence of firms above the lower-mid-market turnover threshold suggests some established contract-manufacturing capacity, while the recent-incorporation tail is modest. For researchers, the useful read is a regional supply base serving business customers, not a venture-style cluster built around early-stage product IP.
Market structure is shaped less by a licensing regime than by product liability, customer audit and environmental expectations. Rubber and plastics work for industrial, construction, marine, packaging and consumer supply chains carries different compliance burdens, but the recurring themes are material conformity, batch traceability, quality-control evidence and documented handling of waste and rejected product. Packaging and consumer-facing uses tend to attract scrutiny on recyclability and claims, while construction and marine customers are more likely to focus on performance documentation, installation conditions and liability allocation. That makes compliance a sales and production issue, not just a back-office function.
Maturity is likely to matter more than company formation. The cohort appears weighted towards established production operators, and firms that can combine repeat manufacturing with credible quality control should find it easier to defend account relationships. Margin pressure will still come from resin costs, energy use and customer procurement discipline. Consolidation may be selective, with succession planning and capacity gaps creating opportunities for acquisitions rather than a broad wave of new entrants. Growth, where it appears, tends to come through process automation, material substitution and deeper work with existing industrial customers.
53
Active firms
2026
8
Over £5M
revenue threshold
5
Since 2022
newer incorporations
Key facts
About 15% of the trading cohort reports turnover above £5M (8 of 53 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (5 firms), so a sizeable share is in its first few filing cycles.
Rubber and plastics manufacturers around Southampton make moulded, extruded and fabricated polymer components for the city’s industrial supply base.
The segment sits between raw polymer inputs and downstream assemblies, so demand tends to follow local manufacturing and engineering procurement.
Supplier choice tends to hinge on short production runs, tooling knowledge and local delivery, rather than catalogue-only purchasing.
Top Southampton Plastics companies
Siva Plastics Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsManufactures flexible polyethylene packaging films and bags using blown film extrusion, flexographic printing, lamination, and conversion processes. Supplies printed and laminated films, mailers,…
Serves B2B customers in food, e-commerce, healthcare, medical and horticultural sectors, including brands and manufacturers needing polyethylene packaging films, bags and related flexible packaging…
Financial Health
HealthyHealthy · -1% CAGR over 2y
Location
MARTINS RUBBER COMPANY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, develops and manufactures engineered rubber components including technical seals, gaskets and specialist mouldings. Provides rubber-to-metal and rubber-to-plastic bonding, compound and…
Serves B2B manufacturers and engineering teams in aerospace, defence, energy, motorsport, oil and gas, prestige automotive and processing industries needing specialist rubber components.
Financial Health
WeakWeak · -67% CAGR over 4y
Location
1865 LLP
Trajectory
5y · 2021–NowDesigns, develops and manufactures engineered rubber components including moulded seals, gaskets and specialist mouldings. Provides rubber‑to‑metal and rubber‑to‑plastic bonding, compound and…
Serves B2B customers in aerospace, defence, engineering, manufacturing, motorsport, processing, nuclear and renewables, oil and gas, and prestige automotive sectors, including companies needing…
Financial Health
Insufficient historyInsufficient history
Location
ASK PLASTICS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures polythene packaging products including bags, covers, films, sheeting, shrink wrap and refuse sacks. Supplies materials with recycled content and offers collection and recycling of used…
Serves B2B customers needing polythene packaging and materials, including buyers of bags, covers, films, sheeting, shrink polythene, refuse sacks and agricultural plastics.
Financial Health
StableStable · -3% CAGR over 5y
Location
Phase 3 Plastics Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsManufactures thermoformed plastic packaging including blister packs, handling trays and clamshells. Designs and produces custom packaging from concept to finished product for sectors such as…
Sells B2B to manufacturers and product companies in the electronics, pharmaceutical, medical, aerospace, defence, marine and construction sectors, in the UK and internationally, including startups…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 3y
Location
POLYCLEAR LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures recyclable polythene packaging products, including bags, liners, pallet covers, films, sheeting and shrink wrap. Produces packaging to customer specifications for distributors supplying…
Serves established distributors and B2B customers including UK retail groups, food producers, and organisations in industrial, construction and agriculture sectors needing polythene packaging.
Financial Health
HealthyHealthy · -8% CAGR over 4y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures bespoke heavy-duty polythene bags and industrial packaging, including food-grade, resealable, anti-static and anti-corrosion packaging. Provides design and print services and produces…
Serves businesses needing bespoke industrial polythene packaging, including food, medical, aggregates, horticulture, fuel, animal feed and industrial firms with heavy-duty or specialist packaging…
Financial Health
StableStable · 0% CAGR over 2y
Location
AMBERDALE MANUFACTURING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures bespoke polythene film and flexible packaging for the food industry. Operates extrusion, conversion and printing processes to produce bags, sheets and covers, and supplies packaging…
Serves B2B customers in the food industry and other commercial sectors needing bespoke flexible polythene packaging, with supply relationships across the UK and Europe.
Financial Health
WeakWeak · 1% CAGR over 4y
Location
SPECIALISED POLYMER ENGINEERING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures custom polymer components, particularly aircraft seals, for aerospace and industrial applications. Works with materials including EPDM, silicone, fluorocarbon and…
Sells to B2B customers, especially large aerospace and aircraft manufacturers, including commercial, military and industrial buyers. Serves engineering and procurement teams needing custom polymer…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 5y
Location
ENOFLEX LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops and manufactures composite pipeline systems using industrial-scale additive manufacturing. Produces specialised pipes such as SPC and PEEK‑CF for energy infrastructure applications including…
Serves B2B energy infrastructure customers involved in LNG, carbon sequestration and hydrogen projects, including operators and developers needing pipeline solutions for low-carbon energy systems.
Financial Health
StrongStrong · Hiring · 15% CAGR over 2y
Location
CUSTOM COVERS (1984) LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsManufactures marquees, frame structures and temporary shelters for events and other applications. Produces bespoke PVC covers, roof and wall panels, and interior marquee linings with options for…
Serves B2B customers in the events industry, plus sporting, industrial, agricultural and military organisations needing marquees, temporary shelters, linings or fabric cover solutions.
Financial Health
WeakWeak · 7% CAGR over 1y
Location
Pcs Powder Coatings Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
FUTUREMOST LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -71% CAGR over 4y
Location
BABA CORPORATION LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
K AND B TRADING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
SABRE WORKSHOP LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy
Location
SOLENT PRECISION (EUROPE) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures plastic injection mould tools and precision‑engineered components for subcontract production. Provides tooling design, spark erosion machining, inspection, and maintenance…
Serves B2B customers in manufacturing and motorsport, including Formula 1 partners, that need plastic injection mould tooling, precision components, and related design or maintenance support.
Financial Health
StableStable · -3% CAGR over 4y
Location
AIRFLOW (NICOLL VENTILATORS) LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures plastic building and ventilation products including airbricks, wall vents, soffit vents, ducting and eaves ventilation components. Also produces plastic buckets, tubs, paint trays and…
Serves UK builders’ merchants, garden centres and retailers, plus trade buyers in painting, decorating, plastering, plumbing, ventilation and roofing. Also supplies OEM and industrial customers in…
Financial Health
WeakWeak · -78% CAGR over 3y
Location
Specialised Engineering Products Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies engineered sealing and component products, including CNC waterjet and knife‑cut gaskets, rubber mouldings, extrusions, inflatable seals, machined components and safety…
Serves B2B customers in petrochemical, food and pharmaceutical, aerospace, marine, oil and gas, nuclear, railway, defence and Formula 1 sectors, including engineering, manufacturing and…
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
Technix Rubber & Plastics Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures rubber and plastic products including safety surfacing, playground and gym tiles, flooring and matting, marine fendering, ground protection systems, rubber sheeting, hoses and ducting,…
Serves trade and professional buyers needing rubber and plastic products, including safety surfacing installers, flooring and matting users, marine engineering/fendering customers, ground protection…
Financial Health
WeakWeak · -1% CAGR over 4y
Location
THE RUBBER COMPANY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies rubber products including gaskets, seals, extrusions, mouldings, sheeting, safety matting, and marine fenders. Provides custom rubber components using various elastomer…
Serves B2B customers across industrial, construction and marine sectors, including engineers, buyers, architects, contractors and developers, as well as organisations needing safety matting for…
Financial Health
StableStable · -66% CAGR over 4y
Location
B.E.C Global Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plastic injection moulding services including product design support, in-house toolmaking, and manufacture of moulded plastic components. Produces custom filter assemblies and encapsulated…
Serves B2B product startups, manufacturers, buyers and R&D teams, from one-person businesses to global industry leaders, across automotive, marine, biomedical, transport, FMCG and technology sectors.
Financial Health
HealthyHealthy · 2% CAGR over 4y
Location
ADVANCED MARINE DECKING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies, designs and fabricates synthetic teak marine decking using Flexiteek materials. Provides custom CNC-cut decking for sailing boats, powerboats and other vessels, working with boat builders…
Serves both B2C boat owners and B2B OEM boat builders across the UK and Ireland, including owners and manufacturers of sailing boats, power boats, RIBs, barges and catamarans.
Financial Health
WeakWeak · -7% CAGR over 4y
Location
Flexiteek Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures synthetic teak decking systems for boats made from PVC. Designs and supplies decking materials and custom deck solutions for boat builders, marine trade professionals and boat owners…
Serves boat owners, OEM boat builders and marine trade professionals worldwide, including fabricators, resellers and distributors in major marine regions.
Financial Health
WeakWeak · -2% CAGR over 4y
Location
Provincial Rubber Agencies Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies industrial rubber, polymer, and foam products, including rubber sheeting, gaskets, hoses, conveyor belting, matting, and sealing materials. Provides rubber mouldings,…
Serves UK industrial businesses, manufacturers, maintenance teams and facilities buyers needing rubber, polymer, foam, belting, sealing, hose, matting and site safety products, including custom and…
Financial Health
StableStable · 0% CAGR over 2y
Location
PLIMAT (UK) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies plastic components for pressure pipe systems, including PVC, ABS and MDPE pipes, compression fittings, valves, hoses and accessories. Products are used in industrial piping,…
Serves UK-wide B2B customers, including industrial distributors, contractors, installers, and fire protection or sprinkler system specialists requiring pressure pipe system components.
Financial Health
StrongStrong · Growing · 3% CAGR over 2y
Location
CARBON FIBRE TUBES LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures carbon fibre and composite tubes, including round, square, modular and telescopic tubing. Produces composite sheets and parts using moulding and pressing, and provides CNC…
Serves B2B customers in aerospace, defence, engineering and R&D, including defence primes, UAV and drone developers, fixed-wing aircraft suppliers, and metrology or inspection equipment manufacturers.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
DIAMETRIC TECHNICAL LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsManufactures industrial badges, labels, and nameplates for product branding and identification. Produces electroformed and resin domed badges, injection moulded 3D badges, aluminium nameplates,…
Sells to B2B product manufacturers and brands across audio, automotive, brewery, broadcasting, computing, catering, electronics, leisure, marine, medical, telecoms and vending sectors.
Financial Health
DistressedDistressed · -70% CAGR over 4y
Location
Nutrapod Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
FIBRE MECHANICS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and builds custom sailing yachts, including carbon racing boats and performance cruising yachts. Manufactures carbon fibre composite structures, yacht hulls, and structural components, and…
Serves private yacht owners, professional racing teams, naval architects and custom yacht builders in the high-performance sailing yacht sector.
Financial Health
StrongStrong · Hiring · 35% CAGR over 2y
Location
Greentech Plastics (UK) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProcesses and refines post‑consumer recycled (PCR) plastics, including recycled polypropylene materials, for use in food‑grade and cosmetic packaging. Operates recycling and processing facilities…
Serves B2B plastics and packaging manufacturers, especially food and cosmetics brands or converters needing certified food-grade post-consumer recycled polypropylene materials with traceability.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
HJ PLASTICS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -5% CAGR over 4y
Location
PDV ADVANCED SOLUTIONS LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable · 0% CAGR over 1y
Location
Invisifold Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
VERO TECHNOLOGIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -67% CAGR over 4y
Location
GASKETS DIRECT LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
Trajectory
4y · 2023–NowFinancial Health
Insufficient historyInsufficient history
Location
PROPLASTIX LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 16% CAGR over 4y
Location
FLEXITEEK ISLANDS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
LENTUNE MANUFACTURING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
WeakWeak · -90% CAGR over 2y
Location
AV MOUNTS UK LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Topdoor Southern Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
RFI Seals & Gaskets Limited
Trajectory
4y · 2023–NowFinancial Health
Insufficient historyInsufficient history
Location
R4 SURFACING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -68% CAGR over 4y
Location
Plexico Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -10% CAGR over 4y
Location
EUCLID LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProduces personalised plastic cards and contactless smart cards, including ITSO-compliant ticketing for transport schemes such as ENCTS. Operates card production, identity printing, fulfilment and…
Serves UK public-sector transport authorities, local councils and commercial transport operators needing ITSO smart ticketing, ENCTS concessionary travel and identity card programmes.
Financial Health
HealthyHealthy · Profitable · 1% CAGR over 2y
Location
Seals+Direct Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 2% CAGR over 4y
Location
Skewer Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
HAWKINS CLOCK COMPANY LIMITED
Trajectory
5y · 2022–NowDesigns and manufactures exterior and interior clocks, clock towers, roof turrets, GRP architectural structures, weathervanes, and decorative metalwork. Produces bespoke clock systems and fibreglass…
Serves a mix of B2B, public sector and residential customers, including architects, builders, property developers, councils, schools, churches, heritage specialists, commercial building owners and…
Financial Health
Insufficient historyInsufficient history · 0% CAGR over 2y
Location
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How Southampton Plastics companies work and how to sell to them
What they do
Revenue usually comes from quoted manufacturing work: tooling and set-up charges at the start, followed by unit-priced moulding, extrusion, fabrication, compounding or assembly. Some projects include design-for-manufacture advice, material trials and sample runs, but the commercial aim is scheduled production rather than one-off prototyping. Materials may be passed through at reviewed prices, particularly where resin costs move, while margin sits in machine utilisation, labour control, scrap reduction and repeatability. Warehousing, kitting and delivery can sit around the manufacturing contract where customers want a managed component supply arrangement.
Who they sell to
Customers are usually business buyers with operational risk attached to the purchase: industrial manufacturers, construction suppliers, marine equipment businesses, packaging users and consumer-goods producers. Decision-making typically involves procurement, operations, engineering and quality, with finance brought in where tooling, stockholding or longer supply terms are material. Sales cycles can be short for standard fabrication, but tend to lengthen when drawings, samples, test evidence, customer audits or substitution approvals are required. Routes to market are mostly direct technical selling, repeat RFQs, preferred-supplier lists and tender processes rather than self-serve purchasing.
What they buy
Most Southampton plastics firms tend to spend on production inputs and practical operating systems before speculative commercial tooling. Relevant categories include polymer materials, additives, mould tools, machine maintenance, calibration, quality management, production scheduling, inventory control, energy procurement, waste collection and recycling services. Software spend is usually tied to quoting, job costing, ERP, MRP, CRM, document control, cyber security and traceability rather than standalone growth technology. Services sellers may find demand around recruitment for machine setters and quality technicians, health and safety support, environmental advice, insurance, accountancy, transport and outsourced marketing for technical sales collateral.
Why and how to sell to them
Commercial pain tends to show up in resin price movements, energy costs, underused machines, rejected batches, late deliveries and customer requests for better documentation. Buying intent is more likely when a firm wins a new production account, adds equipment, faces a customer audit, changes ownership, hires into operations or quality, or needs to defend margin on repeat work. Outbound messaging usually works better when it links to a measurable production or compliance problem: lower scrap, clearer traceability, faster quoting, better schedule adherence, fewer manual handovers or less risk in material substitution.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
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