Wood And Plastic Moulded Parts  
   
   
    QUESTIONS ABOUT
PLASTIC MOULDED PARTS



Can I order a moulded part from the plastic products catalogue as a sample?
In principle you can order a sample to act as a prototype. Provided we have it in stock, it can be delivered quickly and at cost price. If we don't have your desired colour in stock, we'll be happy to provide you with an alternative.

Our product overview will show you our entire product range and the variety of options available. It also features moulded parts made with tools operated by some of our customers, which are available subject to the customer's approval.

What is your production bandwidth for plastics?
With injection moulding machines with a clamping force of 160 to 1,300 tonnes, we can make moulded parts from 20g to 8kg using all the current thermoplastics and with a single part comprising up to three elements.

Can your plastic parts be made non-flammable?
Many plastic parts can be treated to be made non-flammable. This can however sometimes affect surface finish and colour.

Are your plastic parts suitable for external use?
Occasional short-term exterior use is OK. For longer or permanent outdoor exposure, we can treat the plastic with UV stabilisers, which slows the UV-induced breakdown of the molecular chains and physical properties of plastic. Caution is advised in low temperatures, which can affect the load-bearing qualities of the plastic.

Are your plastic parts recyclable?
All the plastic parts we produce are fully recyclable and have the relevant information (codes and description) printed on them.

What is PP?
Part of the polyolefins family, polypropylene (PP) is a semi-crystalline thermoplastic. Polypropylene is derived from the polymerisation of the monomer propene with the use of catalysts. Unlike many other plastics, its molecular structure (copolymerisation with PE) and other qualities can undergo significant alteration, giving rise to different types of polypropylene, all with different properties. PP has a density of between 0.895 and 0.92g/cm³ and its E-modulus is between 1,300 N/mm² and 1,800 N/mm². In terms of rigidity, hardness and strength, PP scores higher than polyethylene but lower than other plastics such as polyamide.

Can I mix PP with other materials?
PP can be mixed with mineral fillers such as talcum powder, chalk or glassfibre, thereby significantly enhancing its range of physical properties (rigidity, temperature tolerance etc.).

What is the chemical stability of PP?
PP is stable against almost all organic solvents and fats, most acids and alkalis and common alcohol-based disinfectants. At higher temperatures, PP is soluble in xylene, tetralin und decalin and other solvents. Halogens (chlorine) affect PP detrimentally.

Can PP be glued, printed on, varnished or painted?
Owing to its surface energy, PP needs to be treated with primers or flame retardants before it can be glued, printed on, varnished or painted.

What are the physiological properties of PP?
PP is odourless and does not irritate the skin. Physiologically harmless, it can be used for food and pharmaceutical applications.

How can I identify PP?
If you burn it, it will burn with bright flame. After extinguishing, you can smell a waxy or paraffin smell. Unlike virtually all other plastics (with the exception of PE), PP floats in water.

What is PP's recycling code?
The recycling code for PP is 05.

The recycling code for PP is 05.
Thanks to their excellent strength and firmness, polyamides are often used by the construction industry. Many of the significant polyamides are semi-crystalline thermoplastic polymers characterised by their strength, rigidity and toughness, have good chemical stability and are easily workable. Many of the properties of the polyamides are dominated by the amide groups, which interact with one another via hydrogen bonds. Exact values for the properties of the polyamides depend on factors such as their crystalline structures and especially from their water content. Polyamides react to the moisture of their surroundings by taking on or giving up water. The water is stored in the amorphous areas of the polyamide. Water uptake essentially depends on the concentration of the amide groups. In normal environmental conditions, PA 6 absorbs water at a rate of 2.5 to 3.5% while PA 12 absorbs at a rate of around 0.2 and 0.5%. Polyolefin additives have been developed that guarantee impact resistance even in dry conditions.

How can I recognise PA?
If burned, PA burns with a blue flame with a yellow border; the material bubbles slightly and develops a brown-black edge. Once the flame is out, the smoke smells like horn.

What is the chemical stability of PA?
PA is resistant to organic solvents, oil, fuel and alcohol. Acids and oxidising chemicals corrode PA.

Can PA be glued, printed on, painted or varnished?
PA can be treated with formic acid and then glued. It can be painted and varnished provided you use the correct products.

What is PA's recycling code?
The recycling code for polyamide is 07.

What is ABS?
Acrylonitrile butadiene styrene (ABS) is a synthetic terpolymer made from the monomers acrylonitrile, 1,3-Butadiene and styrene. The proportions of the monomers, and therefore the properties of ABS, can vary from 15 – 35%, 5 – 30% and 40 – 60% respectively. ABS is an amorphous material with a density of 1.05g/cm3. It melts at 220 – 250°C and softens at 95 – 110°C. ABS is well suited to mould injection and thanks to its low shrinkage rate has a reduced tendency to warp and a high level of dimensional accuracy.

How can I recognise ABS?
When burned, ABS gives off smoke and burns with a yellow flame. On extinguishing, the smoke has a sweet, coal-gas-like smell. If you drop it onto the ground, it makes a light reverberant sound.

What is the chemical stability of ABS?
ABS is chemically stable against acids, alkalis, mineral oils, fuels and alcohol. Organic solvents have a very lightly corroding effect.

Can ABS be glued, printed on, painted or varnished?
Thanks to its polar surface area, ABS is suitable for gluing, printing on and painting and varnishing.

What are flame retardants?
Flame retardants can reduce flammability. The usual additives are polybrominated diphenyl ethers such as hexabromocyclododecane (HBCD). When burned, these retardants give off bromide gases that compensate for the radical chain reactions created during burning by trapping the oxygen, thereby preventing combustion. The process can also give off polybrominated dibenzodioxins and dibenzofurans.