Rotational Moulding Powders

Our Supra-Linear range is a result of specialist expertise and extensive development work by Broadway’s in-house technical team. Supra-Linear provides a combination of high stiffness, outstanding toughness and good flow within the mould. Typically, this combination of properties is ideal for applications such as kayaks, canoes and boats. The material can be used in other applications where extra stiffness is desirable, without the normal compromises on impact strength and flowability.

Supra-Linear can be used as the outer and inner skin of a three-layer rotomoulded part, in conjunction with one of our foamed materials to provide an inner core. This combination will provide a wall structure of exceptional rigidity, whilst minimising part weight.

We can offer delayed release options for Supra-Linear. Extending the adhesion time between the mould and the polymer allows the material to conform more precisely to the mould’s surface, capturing fine details and producing a smooth, high-quality finish. Prolonged mould adhesion during cooling ensures more uniform shrinkage, significantly reducing the risk of warping, cracking, or dimensional inconsistencies.

Technical Specification
• MFI (g/10min): 3.4
• Density (g/cm3): 0.95
• Regular or delayed release
• Custom colours available
+ performance product

Properties & Benefits
• High stiffness
• Good flowability
• Exceptional toughness
• Delayed release option for improved detail and reduced risk of warpage and cracking

Typical Applications
• Boats
• Kayaks
• Canoes

Flame retardant (FR) powders are formulated to impart flame retardancy to polyethylene, which is an otherwise combustible material. These powders play a critical role in improving the safety profile of rotomoulded products, vital in applications where fire hazards are a concern.

Our FR powders not only deliver reliable flame-retardant properties but also offer versatility in design, as we can produce custom-coloured FR grades to meet aesthetic requirements. Custom formulations can alter the FR performance of the material, so to ensure compliance and safety, we recommend that any custom-coloured FR formulations undergo testing and validation before use. Our in-house laboratory may be able to assist in this process. Flame retardancy in plastics is profiled by reference to the UL 94 Standard for Safety (Tests for Flammability of Plastic Materials for Parts in Devices and Appliances). However, other test standards are sometimes employed, usually on an industry-specific basis.

These tailored solutions combine safety, functionality, and design flexibility, making them an ideal choice for enhancing the fire safety of rotomoulded products without compromising their visual appeal.

Technical Specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 1.00 > 1.10
• Butene, Hexene & Octane grades available
• Custom colours available
+ performance product

Properties & Benefits
• Flame retardancy: PASS at V-2 (2mm & 6mm)
• Reduced flammability
• Slower fire propagation
• Minimised smoke and toxic emissions
• Enhanced thermal stability
• Protection of structural integrity
• Compliance with safety regulations

Typical Applications
• Automotive trim panels
• Bins
• Chemical tanks
• Small oil and water drums
• Furniture
• Fireproof casings
• Industrial bin lids
• Oil and fuel tanks

Our antimicrobial additives are used to inhibit the growth of bacteria, fungi, and other microorganisms on the surface of plastic products. Incorporated into the polymer, they provide long-lasting protection by disrupting the biological functions of microbes, preventing their growth and reproduction. These additives help to maintain surface cleanliness, reducing the risk of contamination on products used in environments where hygiene is critical or where increased exposure to bacteria is likely.

Antimicrobials are used in various market sectors. In healthcare, plastic items with antimicrobial protection minimise infection risks. Industrial food processing and storage facilities use antimicrobial plastics in food-contact applications. Outdoor playground structures are exposed to a high level of contact, the use of antimicrobial additives helps to ensure safer play environments for children. Baby change trays, toilet seats and portaloos are all examples where antimicrobial plastics are beneficial due to increased exposure to germs and bacteria.

Technical Specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 0.92 > 0.95
• Butene, Hexene & Octane grades available
• Custom colours available
+ performance product

Properties & Benefits
• Prevents growth of bacteria
• Supports the maintenance of sterile environments
• Sterilises likely surface touch points

Typical Applications
• Ergonomic medical items
• Hospital furniture
• Portaloos
• Water coolers
• Water tanks

Foams are widely used in rotational moulding due to their ability to create lightweight yet strong structures with enhanced insulating properties. During the moulding process, the material undergoes a controlled foaming reaction, forming a cellular structure that traps air. This reduces material density while maintaining durability and minimising heat transfer throughout the end component.

Foaming polyethylenes are a core specialty for Broadway. We offer a range of high-performance foams, developed through extensive research by our expert technical team. Rigorously tested with proven performance in large and complex mouldings, these advanced formulations deliver exceptional results in applications like hot tubs and other products requiring superior thermal or acoustic insulation.

Recognising the unique needs of our customers, we also develop custom formulations tailored to specific performance and processing requirements. Whether for thermal insulation, lightweighting, or shock absorption, our foaming grades provide solutions that combine reliability and efficiency across a variety of applications.

Technical specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 0.20 > 0.50
• Butene, Hexene & Octane grades available
• Blow up ratio 2.0 > 5.0

Properties & Benefits
• High, medium or low blow up
• High, medium or low stiffness
• Lightweighting
• Thermal Insulation
• Acoustic Insulation
• Reduced sink marks
+ performance product

Typical Applications
• Insulated boxes
• Hot tubs
• Tanks
• Water coolers

Flexible powders are used in rotationally moulded products which require flexibility, elasticity, and toughness. They can offer greater versatility and durability than is achievable when using more rigid plastics.

The key characteristics of flexible powders include high elasticity, excellent impact resistance, and durability. They can absorb shocks and return to their original shape after deformation. Flexibles can also provide a softer, more comfortable surface for ergonomic applications.

Greater flexibility is achieved through selection of a suitable base material and enhanced by the use of plasticisers or elastomers to further improve flexibility, elasticity, or softness. These additives modify the polymer matrix by increasing the mobility of the molecular chains, making the final product more pliable.

Our flexible powders are available in custom colours and are widely used in products such as playground equipment, sporting goods, seating, protective cases
and medical devices – applications where toughness and durability are essential in avoiding damage and prolonging the life of the product.

Technical Specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 0.92 > 0.95
• Butene, Hexene & Octane grades available
• Custom colours available
+ performance product

Properties & Benefits
• Enhanced flowability adapts to intricate shapes and aids uniform distribution for consistent wall thickness
• Less prone to cracking under stress, improving durability and product lifespan
• Useful for products subjected to extreme conditions, impacts or frequent contact

Typical Applications
• Automotive trim panels
• Barriers
• Ergonomic medical items
• Recreational equipment
• Sports equipment

Polyethylene, the principal material of the rotational moulding industry possesses excellent insulating properties. However, certain applications require materials that can safely dissipate static charges to prevent spark hazards. To address this need, we offer conductive materials which impart a controlled
degree of electrical conductivity to polyethylene.

This innovation makes it possible to manufacture containment products such as drums, bins, and other storage solutions suitable for environments where static electricity might otherwise pose a safety risk. Conductive powders are critical for applications in contact with flammable or explosive materials, where even minor sparks could lead to catastrophic incidents.

We can achieve high levels of conductivity in a variety of material grades. This ensures we can tailor a conductive solution to suit specific application requirements, providing both safety and versatility, without compromising the inherent durability and workability of polyethylene.

Technical Specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 0.90 > 0.94
• Butene, Hexene & Octane grades available
+ performance product

Properties & Benefits
• Enhanced flowability adapts to intricate shapes and aids uniform distribution for consistent wall thickness
• Less prone to cracking under stress, improving durability and product lifespan
• Useful for products subjected to extreme conditions, impacts or frequent contact

Typical Applications
• Automotive trim panels
• Barriers
• Ergonomic medical items
• Recreational equipment
• Sports equipment

Our natural LDPE and LLDPE powders are ground in-house. They’re produced using polymers from industry-leading suppliers – ensuring that every batch meets stringent quality standards and complies with EU REACH regulations.

Each of our natural grades provides excellent chemical resistance and is UV-stabilised for enhanced durability in outdoor applications, delivering reliable performance in demanding environments. These attributes make our natural powders an excellent choice for sectors that need cost-effective solutions, without compromising on compliance or material integrity.

These powders are particularly suited to customers looking to customise materials to their unique specifications, offering the flexibility required across a wide range of applications. Designed for functionality and cost-effectiveness over aesthetics, they’re ideal for products such as water and chemical storage tanks, feed hoppers, and utility bins, where durability and compliance come first.

Technical Specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 0.93 > 0.94
• Regular or delayed release
• Butene, Hexene & Octane grades available

Properties & Benefits
• High, medium or low stiffness
• Good flowability
• Low warpage
• Excellent impact strength
• Tough and durable
• Excellent processability

Typical Applications
• Agricultural feeders
• Animal housing
• Bins
• Containers
• Furniture
• Garden planters
• Grit bins
• Industrial bin lids
• Machinery casings
• Marine buoys
• Portaloos
• Recreational equipment
• Security boxes
• Small oil and water drums
• Sports equipment
• Chemical tanks
• General purpose tanks
• Oil and fuel tanks
• Water tanks
• Water coolers

Based on our wide range of natural polymers, Broadway’s black powders offer versatility for use in a wide range of applications, including anything from oil tanks and automotive parts, through to flower pots and outdoor furniture.

All grades are UV stabilised and suitable for outdoor use. We also offer an option with the added benefit of WRAS approval. Speciality grades can also be formulated as black powder on request.

Subject to availability, our recycled black powder offers great value. Made from internally recycled, coloured, and ground LDPE, it provides an eco-friendly solution for material that could otherwise be waste. This budget-friendly option is ideal for customers seeking an affordable black powder alternative. Call us for further details and current stock availability.

Technical Specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 0.93 > 0.94
• Regular or delayed release
• Butene, Hexene & Octane grades available

Properties & Benefits
• High, medium or low stiffness
• Excellent processability
• Medium flowability
• Excellent Impact strength
• Tough and durable
• WRAS approved black available
• Cost-effective, recycled black available

Typical Applications
• Agricultural feeders
• Automotive trim panels
• Bins
• Containers
• Garden planters
• Industrial bin lids
• Machinery casings
• Portaloos
• Security boxes
• Small oil and water drums
• Sports equipment
• Chemical tanks
• General purpose tanks
• Oil and fuel tanks

Roto powders manufactured using recycled feedstock are increasingly popular as industries embrace sustainable practices. The use of these powders supports circularity in plastics. Using recycled materials reduces waste going to landfill or energy recovery, and improves the environmental impact of the end product.

Customer demand for recycled powders continues to grow. This shift is largely fuelled by the desire to reduce reliance on non-renewable resources and to meet sustainability commitments. Recycled powders provide a practical solution, but consistent supply of high quality recyclate can prove challenging. Thanks to new supply chains, we’re pleased to offer powders manufactured using high-quality, certified, post-consumer recycled LLDPE, from a reputable polymer supplier. We can include up to 50% PCR in the formulation.

Recycled rotational moulding powders are ideal for applications such as garden furniture, playground equipment, and outdoor products – where sustainability is an important consideration and aesthetic and mechanical compromises can be accepted. Our mottle effects can be provided in custom colours and utilised to mask inconsistent imperfections, providing a more uniform ‘recycled’ appearance, which appeals to customers and consumers alike.

Technical Specification
• MFI (g/10min): 2 > 4
• Density (g/cm3): 0.92 > 0.94
• Regular or delayed release
• Butene grade
• Custom colours available

Properties & Benefits
• Typically up to 50% PCR content is achievable
• Sustainable option reducing waste material
• Can be combined with colour and mottle effects to enhance the recycled appearance of the final product

Typical Applications
• Agricultural feeders
• Barriers
• Bins
• Containers
• Furniture
• Garden planters
• Machinery casings
• Portaloos
• Security boxes

For large mouldings and slower cycles, pellets (or granules) provide a cost-effective alternative to using powders. In such cases, the need for powder is reduced as the longer cycle gives the polymer more time to melt and distribute evenly within the mould. The use of pellets is best considered when precise control of wall thickness or even distribution of the polymer is less critical. It also provides an option for customers who wish to grind their own material.

Broadway has extensive experience in the development of custom colour, pelletised materials through our masterbatch and compounding divisions. Our roto pellets are produced to the same high specification, ensuring an almost limitless selection of colours, uniform particle size and an even distribution of colour and other constituents throughout the material.

Fewer processes are needed in production, so by saving the cost, energy and time associated with grinding, the use of pellets offers a cheaper alternative to powdered equivalents. Other benefits include ease of handling and reduction of dust particles in your production facility. We can also supply pelletised material in lower volumes and increments than powders, offering further flexibility. By utilising this option where feasible, our rotational moulding customers can reduce material costs, as well as leadtimes.

Technical Specification
• MFI (g/10min): 5 > 20
• Density (g/cm3): 0.93 > 0.94
• Regular or delayed release
• Butene, Hexene and Octane grades available
• Custom colours available

Properties & Benefits
• High, medium or low stiffness
• Good flowability
• Low warpage
• Excellent impact strength
• Tough and durable
• High-quality, uniform size, pelletised material
• Flexibility for customers to grind if preferred
• Cheaper alternative to using powders
• Wide variety of material types available

Usage Guidelines
Most materials featured on this page are available in pelletised form as an alternative to powders, if required. We recommend using pellets only for select rotomoulding applications and after conducting thorough material trials to ensure suitability.