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Rubber And Plastics Companies in Swansea: 25 Active Firms (2026)
Rubber and plastics manufacturers produce moulded, extruded and fabricated polymer components for industrial customers in the Swansea area.
Buying sits mostly with operations, procurement and engineering teams rather than corporate IT: these suppliers win work through material capability, tooling access, production tolerance and repeat fulfilment. Typical customers are business buyers in manufacturing, construction, packaging, engineering and infrastructure, with contracts often tied to product qualification, sample approval and scheduled batch supply. Engagements tend to be mid-market industrial in character, where buyers want dependable process control, documentation and capacity for repeat runs, not just one-off fabrication. Tooling, compounding knowledge and inspection routines usually matter as much as price.
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Swansea has 25 actively trading rubber and plastics manufacturers in this list, so the local picture is concentrated enough for buyer-by-buyer mapping rather than broad market sizing. Reported employment totals 605 people, giving the sector a visible manufacturing footprint relative to its small company count. The mix appears to include owner-managed producers, subcontract manufacturers and industrial suppliers serving local and regional supply chains, with turnover scale likely uneven across a small base.
Material and process compliance tends to be buyer-led in this corner of manufacturing. Construction, packaging, engineering and infrastructure customers commonly specify tolerances, material grades, testing evidence and traceability before approving a supplier, so commercial access is shaped by qualification processes as much as by local capacity. Waste, energy use and polymer sourcing also sit close to operating cost and tender scrutiny. For Swansea producers, the practical market structure is therefore part factory capability, part documentation discipline, with repeat contracts often depending on audit readiness and stable batch quality.
Future movement appears likely to favour firms that can sit deeper in customer production planning rather than those selling commodity fabrication alone. Buyers in construction, engineering and infrastructure tend to reward suppliers that can manage repeat tolerances, documentation and material substitution without interrupting project schedules. Scale-up scarcity may remain a constraint in Swansea, particularly where investment in tooling, premises and skilled operators is needed before revenue follows. Consolidation or succession-led ownership changes may be more plausible than a wave of new entrants.
25
Active firms
2026
8
Above £5M
Reported revenue
4
Since 2022
Recent incorporations
Key facts
About 32% of the trading cohort reports turnover above £5M (8 of 25 firms) — the rest sits below that revenue band.
16% of the cohort was incorporated since 2022 (4 firms), so a sizeable share is in its first few filing cycles.
Swansea-area rubber and plastics manufacturers typically serve industrial buyers needing moulded, extruded or fabricated polymer components.
Tooling, repeat production and customer qualification tend to shape supplier selection in this segment.
The cohort sits in the middle of the supply chain, converting polymer materials into specified parts for customer applications.
Top Swansea Rubber And Plastics companies
BIO-ISOLATES LIMITED
Trajectory
5y · 2022–NowManufactures tamper‑evident packaging products including shrink sleeves, capsules and bands, and distributes caps and closures such as cork stoppers, aluminium ROPP caps and screwcaps. Supplies…
Serves B2B producers and packagers in food, drink, pharmaceuticals, health, beauty, industrial and medical gas, including artisan brands, contract packers, supermarket own-label suppliers and life…
Financial Health
Insufficient historyInsufficient history
Location
Spatz Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures vacuum‑formed plastic components and assemblies and extrudes polyolefin sheets. Provides CNC machining, CAD/CAM design, fabrication and in‑house tooling to produce prototypes and…
Serves UK businesses and industrial manufacturers needing prototype and production plastic components, assemblies, sheet extrusion, CNC machining, fabrication and tooling support.
Financial Health
WeakWeak · Hiring · 14% CAGR over 4y
Location
ENVICO ENGINEERING LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns, manufactures and installs glass reinforced polymer (GRP) housings, cabinets and enclosures for electrical, EV charging, gas, water and telecommunications infrastructure, including…
Serves B2B utility and infrastructure customers, including electricity DNOs/IDNOs, EV charging providers, gas, water and telecommunications operators needing industrial enclosures and cabinets.
Financial Health
StrongStrong · Profitable, Growing, Hiring · 7% CAGR over 2y
Location
Viscose Closures
Manufactures tamper‑evident packaging products including shrink sleeves, bands and capsules, and distributes caps and closures such as cork stoppers, aluminium ROPP caps and screwcaps for food,…
Serves B2B product manufacturers, artisan producers, contract packers, leading brands and supermarket own-label suppliers in food, drink, pharmaceuticals, health and vitamins, cosmetics, gas and life…
Location
Pro-Tect Grp Enclosures Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures glass‑reinforced plastic (GRP) enclosures and structures, including cabinets, kiosks, gatehouses, bunded and security enclosures, roofs and canopies. Produces bespoke units with…
Serves B2B and public-sector buyers procuring bespoke GRP enclosures, including facilities, infrastructure and site-management teams needing cabinets, gatehouses, tollbooths, security or bunded units.
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 4y
Location
Manufactures tamper‑evident packaging products including heat shrink sleeves, shrink bands and capsules, and plastic‑free shrink sleeves. Also distributes caps and closures such as cork stoppers,…
Serves B2B customers in food, drink, pharmaceuticals, health and vitamins, beauty, industrial and medical gas, and scientific/medical testing, including artisan producers, contract packers, brands,…
Location
RE-WORKED LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures recycled surface panels and materials for commercial interior applications. Products include panels made from recycled plastics, textiles such as denim, and mineral waste, used for…
Sells B2B to commercial interior specifiers and buyers, including architects, designers, fit-out teams and contractors serving hospitality, retail, exhibition, workplace and washroom projects.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 4y
Location
H & S MOULDINGS (WALES) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
P.L.J. & SON SPECIALISED MOULDINGS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -5% CAGR over 4y
Location
GRP Development Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies glass‑reinforced plastic (GRP) cabinets and walk‑in enclosures for outdoor equipment storage and infrastructure applications. Products include weather‑resistant cabinets…
Financial Health
StableStable · -5% CAGR over 2y
Location
CRONFA CYF
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures prebuilt glass reinforced plastic (GRP) composite buildings and enclosures for utility and infrastructure sectors, including gas, water, electricity, nuclear, rail and renewable energy…
Serves UK utility and infrastructure organisations, including gas, water, electricity, nuclear, rail and renewables operators and contractors, with buyers in capital projects, engineering and…
Financial Health
StableStable
Location
INDUSTRIAL GRP LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures glass‑reinforced plastic (GRP) kiosks, cabinets and enclosures for industrial and utility applications. Products include security-rated housings, explosion relief and acoustically lined…
Serves UK water and gas utility companies, their contractors and supply chains, plus industrial and commercial organisations needing external equipment housing or secure enclosures.
Financial Health
HealthyHealthy · -78% CAGR over 3y
Location
European Plastics Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures plastic roofing and building products including dry verge systems, eaves trays, ventilation components, dry ridge and hip systems, GRP valleys, breather membranes, slate hooks, fixings,…
Serves UK roofing trade customers, including roofing contractors, builders’ merchants and construction firms needing dry-fix roofing products and accessories delivered to yards or sites.
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
Adept Grp Enclosures Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures glass‑reinforced plastic (GRP) cabinets, enclosures and kiosks for housing electrical and infrastructure equipment. Produces standard and bespoke units, including cabinet…
Serves trade and B2B customers across the UK, including infrastructure operators, utilities, contractors and industrial buyers needing GRP or steel cabinets, kiosks and enclosures.
Financial Health
StrongStrong · Hiring · 260% CAGR over 2y
Location
KRANE ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and installs corrosion‑resistant equipment including rubber linings and coatings, GRP tanks and ductwork, and solid plastic fabrications in materials such as PVC, PTFE and HDPE. Provides…
Serves B2B industrial clients, including water and effluent treatment operators, metal finishing firms, materials handling operations, industrial plants, and companies with steelwork, machinery or…
Financial Health
StableStable · -2% CAGR over 4y
Location
Enclosure Tec Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures glass‑reinforced plastic (GRP) cabinets, enclosures and housings for utility and infrastructure use, including roadside cabinets, single and double door units, walk‑in enclosures, and…
Serves utility providers, electrical contractors and infrastructure operators needing roadside, trackside or bespoke enclosure projects, plus organisations buying standard cabinet products online.
Financial Health
HealthyHealthy · Growing, Hiring · 3% CAGR over 4y
Location
Morgan Marine Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns, manufactures and installs glass‑reinforced plastic (GRP) and steel enclosures, kiosks, cabinets and covers for utility and construction applications. Provides bespoke design, electrical…
Serves B2B customers in the utility and construction sectors, including organisations needing project-scale GRP or steel enclosures, cabinets, covers and security solutions across Europe and…
Financial Health
StrongStrong · Profitable, Hiring · 6% CAGR over 3y
Location
Direct GRP Solutions Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies glass‑reinforced plastic (GRP) cabinets, kiosks and walk‑in enclosures, including single and double door units and apex‑roof structures. Offers standard and customised…
Serves B2B buyers and trade customers needing stock or customised GRP cabinets, walk-in enclosures and kiosks, including organisations purchasing online with delivery requirements.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
Location
ALPHA BELLOWS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures metal, rubber, fabric and PTFE bellows, expansion joints and flexible hoses for piping systems. Provides custom engineering, machining, welding, testing, repair and…
Serves industrial B2B customers worldwide, including engineering, procurement and maintenance teams responsible for pipework systems in plants with high-pressure, high-temperature, cryogenic or…
Financial Health
StableStable
Location
JABRO HARNESSES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing, Hiring · 5% CAGR over 4y
Location
QualitecGRP Ltd
Trajectory
2y · 2025–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
WINDOW TRADE CENTRE LIMITED
Trajectory
3y · 2023–NowFinancial Health
Insufficient historyInsufficient history
Location
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How Swansea Rubber And Plastics companies work and how to sell to them
What they do
Revenue usually comes from contracted manufacture rather than intellectual-property licensing: moulded, extruded, compounded or fabricated polymer components are priced through tooling charges, unit rates, batch minimums and repeat supply agreements. Some firms also earn from design-for-manufacture support, material selection, assembly, finishing, inspection and stockholding for customers that need parts available against production schedules. Margins tend to depend on machine utilisation, scrap rates, resin and additive costs, energy use and the ability to recover set-up time across repeat orders. A small trial order can therefore be less attractive than an approved part that returns through scheduled releases.
Who they sell to
Customers are usually business buyers rather than consumers: local manufacturers, construction-product suppliers, packaging users, engineering contractors and infrastructure-facing procurement teams. The practical sponsor is often an operations manager, production engineer or quality lead, while procurement controls price comparison, terms and supplier onboarding. New work commonly starts through drawings, samples, material specifications or a request for quotation, then moves through prototyping, sample approval and site or document checks before routine ordering. Repeat buyers may transact directly once a part is qualified, but tender-led and framework-led routes appear more common where end customers operate in construction or public infrastructure supply chains.
What they buy
Most Swansea rubber and plastics firms tend to spend on factory systems and services that keep machines running, orders traceable and rejects contained. Useful categories include production planning, inventory control, job costing, quality management, maintenance scheduling, energy monitoring, health and safety, document control and customer-facing quote management. They also buy metrology, test equipment, tooling support, recruitment for machine setters and engineers, waste handling, accountancy, trade credit insurance and transport. Cloud software can fit where it reduces admin around batch records or scheduling, but propositions framed as general office digitisation may miss the buyer unless they connect directly to throughput, compliance or margin.
Why and how to sell to them
Buying intent tends to appear when a manufacturer wins a repeat contract, adds tooling, changes premises, replaces machinery, hires operational leadership or faces tougher customer audits. Resin price movement, energy bills, scrap, downtime and late deliveries all create openings for vendors that can tie a proposal to cost per part, machine availability or qualification evidence. Outbound should usually lead with a production or compliance problem, not a generic growth claim. Messages that reference batch traceability, set-up reduction, preventive maintenance, tender documentation or supplier approval are more credible for this market than broad claims about efficiency.
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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