As an Australian Manufacturer for over 25 years, Allmould Plastics Group have the expertise and the facilities to take your project from initial idea right through to finished product

Providing high end closures and packaging solutions to a various range of markets including food, dry goods, telecommunications, chemicals, beverages and more

Tolerances are acceptable variations in size for overall dimensions and part features. As a rule, parts with tighter tolerances are more expensive because they have stricter injection mold and processing requirements. In addition, parts with fine tolerances are more expensive to mold than parts with commercial tolerances.

We exist to eliminate bottlenecks in new product development by integrating the people, processes, and platform you need to source custom parts.

Create your free Fictiv account and request an injection molding quote today — we mold complex parts at ridiculous speeds!

HDPE crystallizes fairly quickly. Therefore, thin-walled parts need fast injection speeds. For thicker-walled parts, medium injection speeds are recommended.

Nylon has good mechanical strength and can be filled with glass fibers for enhanced properties. It absorbs moisture, however, so nylon is not a good choice for injection molded products where there’s continuous contact with water.

HDPE, a type of polyethylene (PE), is a commonly used injection molding material that is significantly less expensive than specialty plastics and polymer blends. HDPE is readily available and has lower minimum order quantities (MOQs) than specialized materials.

Access a wide breadth of capabilities through our highly vetted network.

We exist to eliminate bottlenecks in new product development by integrating the people, processes, and platform you need to source custom parts.

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Established in 1995, Allmould Plastics is a privately owned, family run business specializing in injection moulding. We place strong importance on customer satisfaction, constant high quality and value for money. Allmould Plastics has grown and developed over the last 20 years into a strong Customer Service orientated company. With our new built premises, fully designed to suit our customers’ needs and requirements, we are continually improving.

The melt temperature for HDPE is between 246 to 280°C. The mold temperature ranges between 45 and 65°C. Increasing the mold temperature can reduce internal part stresses and produce parts with a glossier surface finish.

Adherence to HDPE processing guidelines is beyond a part designer’s immediate control. Therefore, it’s important to work with an experienced HDPE injection molder. The following processing parameters are especially important:

HDPE parts that are poorly designed are more prone to injection molding defects. When you work with Fictiv, however, you’ll get DFM feedback that can help minimize risk. To learn about part design, download our free “Injection Molding Design Guide” to use as a reference.

High-density polyethylene is a low surface energy (LSE) material that is very difficult to bond. Overmolding, an injection molding technique that molds one material over another, is ill-suited for HDPE. Specialized glue and adhesives for HDPE are available, but plastic fusion welding can also be used for assembly.

Then, create a free Fictiv account and upload your part drawing. Along with design for manufacturing assistance (DFM) from our engineering experts, you’ll gain access to our carefully vetted network of manufacturing partners. Why search for an HDPE injection molder on your own when you can get expert DFM feedback and leverage the power of Fictiv?

Allmould Plastics Group is extremely passionate in relation to Medical component development, not only for the human side of this industry but also Veterinary

Sharp corners are difficult to injection mold. Therefore, apply radii to both the inside and outside corners of your part. To limit stress concentrations and melt flow, make the radii at least 25% of the wall thickness. For maximum part strength, apply a radius equal to 75% of the wall thickness.

HDPE is available in various brands and grades. The table below contains typical physical, mechanical, and injection molding properties of this popular material.

The injection pressure for HDPE injection molding depends on the design and size of your part. In general, however, injection pressures range from 5.5 to 10 MPa because HDPE flows readily. Reducing the injection pressure can help reduce part warpage.

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HDPE can be injection molded for industrial, automotive, and consumer goods applications. Food contact applications are less typical, but FDA grades of HDPE plastic are available.

Plastic Fabrication & Sheeting Products to serve a wide range of industries including point of sale display, building, manufacturing, retail, engineering and transport.

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HDPE has a relatively high coefficient of thermal expansion (143 μm/°C), a property that describes the extent to which a material expands with an increase in temperature. Because heating occurs during injection molding, HDPE parts can expand significantly. In turn, injection-molded HDPE may experience warping when it contracts during cooling.

AMP Circular is not a typical business but rather a platform that sits under the Allmould Plastics Group to manage circular and recycling programs through the public and private sectors in Australia

Our trained employees ensure your parts will be delivered on time and to spec.

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Create high quality custom mechanicals with precision and accuracy.

Injection molded HDPE might not be the best material for your application. If that’s the case, you could consider polypropylene or nylon instead. Fictiv’s injection molding services work with both of these materials.

HDPE can’t compete with engineering plastics in terms of performance, but it’s an attractive, low-cost option for many applications that require good tensile strength, impact resistance, and overall toughness.

“Allmould Plastics is our preferred supplier for all our plastic injection moulding needs. Their exceptional quality and customer service never fail to impress.”

HDPE is petroleum-based and highly flammable. It begins to burn when exposed to temperatures above 340°C and will continue to burn since it’s not self-extinguishing. For reduced flammability, HDPE grades with flame-retardants are available.

Polypropylene (PP) is a commodity thermoplastic with good fatigue strength, a low coefficient of friction, and excellent moisture resistance. Like HDPE, it’s also cost-effective.

If you’re considering HDPE injection molding for your plastics project, keep reading to learn more about high-density polyethylene, including:

Injection molded HDPE has a relatively high rate of shrinkage (up to 4%). The exact percentage depends on the grade of HDPE that you select, as well as the specific processing conditions. If parts shrink unevenly during cooling, warping may occur. To limit the risk of defects, reduce the wall thickness and the size of the mold gate area.

HDPE is an injection molding material with attractive properties, but a manufacturing-ready design and a skilled production partner are critical. Fictiv has the engineering experts and manufacturing network you need to get quality parts fast. From prototyping through production, we’re here to help you succeed.

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HDPE injection molding uses high-density polyethylene (HDPE), a cost-effective thermoplastic with good tensile strength and high impact resistance. This commodity plastic also has strong moisture resistance and is relatively easy to injection mold. HDPE is used in many applications, but it has a high rate of thermal expansion. Consequently, injection-molded HDPE parts are prone to higher shrinkage rates if they’re not designed and manufactured properly.

Draft is the angle that you apply to the vertical walls of parts so that they eject cleanly from the injection mold. Because HDPE has a low coefficient of friction, parts with simple shapes need very little draft. For more complex HDPE parts, apply draft angles between 0.5% and 1% per side.

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Whenever possible, apply a uniform wall thickness throughout your part. If you need to use a greater thickness in some areas, make the transition from thinner to thicker sections gradual. Do not use transitions that are greater than 10% to 15% of the nominal wall thickness. Generally, the recommended minimum wall thickness for HDPE ranges between 0.76 and 3.18 mm.

“It is a pleasure to work with your company; your team is most helpful in attending to our requirements and delivery schedules. We love your service that goes the extra mile!”

Turn Concept Into Reality From your initial concept, we provide product development, drafting and prototyping, all the way through to manufacture.

HDPE does not readily absorb moisture. If stored properly, it may not need drying before injection molding. Drying is required, however, if surface moisture has settled onto the material during storage.

Allmould Plastics Group is heavily involved in the development of plastic construction parts within the Construction Industry across Australia and beyond

By signing up, you agree to our Terms of Use and Privacy Policy. We may use the info you submit to contact you and use data from third parties to personalize your experience.

By signing up, you agree to our Terms of Use and Privacy Policy. We may use the info you submit to contact you and use data from third parties to personalize your experience.

By signing up, you agree to our Terms of Use and Privacy Policy. We may use the info you submit to contact you and use data from third parties to personalize your experience.

By signing up, you agree to our Terms of Use and Privacy Policy. We may use the info you submit to contact you and use data from third parties to personalize your experience.

Small Enough To Care With our new purpose built facilities, Allmould Plastics are large enough to get the job done right, but still small enough to care.

Injection-molded HDPE resists a wide range of chemicals, including strong acids and bases. It also resists some oxidants and reducing agents. HDPE can be attacked by halogenated hydrocarbons, however, and it has limited resistance to mineral oils.

“I was extremely impressed with Allmould Plastics assistance and service with my latest custom moulding project. Their professionalism and service was second to none – their technical advice and help with drawings and prototyping is what helped us get ahead of the market, I would highly recommend their service.”