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P&R Labpak Limited has built its reputation for a commitment to quality and customer care with over 25 years experience serving science across all economic sectors.

We are able to offer a vast range of laboratory apparatus, instruments, equipment, consumables and chemicals from our catalogues. We carry stock at our St Helens site and have electronic access to our main supplier giving us live data on product availability.

This means that you get your goods quickly and efficiently.

If you would like to request a quotation for a particular item or have an enquiry, please click here.

We offer varied and flexible services to our customers. In addition to the many products available through our catalogues, we can also:

• Supply production grades and volumes of chemicals and solvents
• Handle all your chemical waste
• Supply and service your microscopes
• Offer third party procurement
• Supply and install laboratory furniture

We do not limit our range to the products in our catalogues. Simply let us know what you are looking for and we'll do our best to meet your requirements.

P&R Labpak Limited offer a comprehensive single source of laboratory chemicals and reagents. These include general laboratory and analytical reagents, culture media, solvents, buffers, biochemicals, water test kits and many more.

• We can supply chemicals in quantities from milligrams to tonnes
• We can supply virtually any chemical you require using our extensive research capabilities
• All chemicals are rigorously tested to meet the critical standards demanded by our customers
• The BDH Prolabo and Merck range of chemicals that we supply are synonymous with quality throughout the world and certificates of analysis can be supplied at no extra charge.
  
• We also sell a wide range of P&R Labpak Limited brand solutions and standards. We can manufacture to order so reaction to customer demand is rapid. The P&R Labpak Limited brand extends to a vast range of general purpose and AR grade chemicals.

P&R Labpak Limited offers a wide range of equipment for all your laboratory requirements from autoclaves and balances to vacuum pumps and water purification systems. A selection of products from key suppliers are shown below but please request our catalogue for details of the full ranges available.

We are able to offer technical assistance and additional product information to help you choose the correct piece of equipment. Given your requirements we will endeavour to source the best goods and put together the products and services appropriate for you at the right price.

Product Range

Sterilin disposable plastics. Pyrex, Quickfit and MBL laboratory glassware.and Azlon reusable plasticware.

The Bibby Scientific range of equipment covering the Stuart and Jenway brands. Items include pH meters, spectrophotometers, fluorimeters, hotplates and stirrers to name a few.

Sartorius weighing technology is available from P&R Labpak Limited with a range of precision and analytical balances together with a wide range of Hettich centrifuges.

The A&D range encompasses a range of balances covering analytical, precision and industrial requirements.

The Mettler range comprises a range of laboratory equipment including a range of precision & analytical balances, ph meters and instruments for density determination.

We can supply many other branded items of laboratory equipment.

 

Visit http://www.prlabs.co.uk to use our online webshop.  Terms and conditions apply.  Call 0870 034 2055 for more details or to enquire about the webshop or anything else.

Neodymium

Neodymium is a chemical element with the symbol Nd and atomic number 60. It is a soft silvery metal that tarnishes in air.

Like most metals, neodymium is a lustrous silvery white colour, and like its twin praseodymium,, it tarnishes rapidly in air so it must be stored under argon (as above) or oil. Like the other lanthanoids, it is a rare earth metal that is anything but rare. In fact, neodymium is exceedingly common -- almost as common as copper -- being the second most common of the rare earth elements in the Earth's crust, following cerium.

Neodymium compounds were first commercially used as glass dyes in 1927, and they remain a popular additive in glasses. The color of neodymium compounds—due to the Nd³⁺ ion—is often a reddish-purple but it changes with the type of lighting, due to fluorescent effects.

Its compounds have a variety of lovely colours -- pink, mauve, purple, violet, green -- that change based on the sort of lighting they are exposed to. For example, neodymium chloride hexahydrate, NdCl₃·6H₂O [see image courtesy of Walkerma (public domain)], is pink when exposed to sunlight (top) and a boring yellowish colour when exposed to fluorescent light (bottom).

Another chief use of neodymium is as the free pure element. It is used as a component in the alloys used to make high-strength neodymium magnets – powerful permanent magnets. These magnets are widely used in such products as microphones, professional loudspeakers, in-ear headphones, and computer hard disks, where low magnet mass or volume, or strong magnetic fields are required. Larger neodymium magnets are used in high power versus weight electric motors (for example in hybrid cars) and generators.

Neodymium magnets are often referred to as "supermagnets". And they are for a reason: a one gram neodymium supermagnet can hold up a 1.3 kg (2.8 lb) iron sphere!

Neodymium metal dust is a combustion and explosion hazard. Neodymium compounds, as with all rare earth metals, are of low to moderate toxicity; however its toxicity has not been thoroughly investigated. Neodymium dust and salts are very irritating to the eyes and mucous membranes, and moderately irritating to skin. Breathing the dust can cause lung embolisms, and accumulated exposure damages the liver.

Even relatively small neodymium magnets cause all sorts of damages, even those that are just a few centimetres square. They are dangerous to people with pacemakers.  Bone fractures from flying magnets and crushing the tip off a finger are not uncommon.

Check out this video link too:-
Neodymium Magnet experiments

For more information visit:-
http://www.theguardian.com/science/grrlscientist/2012/apr/27/1?guni=Article:in%20body%20link
http://en.wikipedia.org/wiki/Neodymium

The House Spider!

There are about 660 different species of spider in the UK, and most of them will never come inside. Each autumn, however, male house spiders come indoors in search of a mate.

The spider species Tegenaria domestica, commonly known as the barn funnel weaver in North America and the domestic house spider in Europe, is a member of the funnel-web family Agelenidae and a close relative of the hobo spider. Domestic house spiders range worldwide from as north as Sweden to as south as Greece in Europe and from as north as Maritime Canada to as south as Louisiana in North America.

The large, hairy house spiders commonly seen in the UK belong to the Tegenaria genus.

House spiders in your bath are normally males who are trapped having fallen off the walls while looking for a female to mate with. Females usually stay in their webs, which are often found under the shed, and await a suitor. After a male has found a female's web he will stay with her for a number of weeks, mating with her repeatedly.

The female then overwinters with stored sperm, and the next spring she can produce 10 egg sacs, each containing around 40 to 60 eggs.

Like most spiders, Tegenaria species subdue their prey with venom. The house spider provides a service for home owners, eating flies and other unwanted insects. They are also ecologically important as food for birds and other animals.

Tegenaria house spiders are not the only species found indoors, and other common species include the daddy-long-legs spider, Pholcus phalangioides (which is not to be confused with the daddy long legs or crane fly, a completely harmless type of fly).

Why not visit the weblink below and get involved with the House Spider Survey being run by the Society of Biology:-
https://www.societyofbiology.org/get-involved/biologyweek/house-spider-survey
Or read more at:-
http://en.wikipedia.org/wiki/Domestic_house_spider

Polish that Chrome!

Chromium is the first of the group 6 transition metals. It is denoted by the symbol Cr and atomic number 24. Chromium is a grey coloured, hard and very lustrous metal.  It takes a high polish, resists tarnishing, and has a high melting point. The name of the element is derived from the Greek word "chrōma" (χρώμα), meaning colour.

Chromium is highly corrosion resistant, a character that it brings with it when added to steel to create stainless steel. Another popular use for chromium is electroplating, which gives hubcaps, bumpers and other shiny bits of cars their street-cred.

Many of its compounds are intensely coloured. Besides providing the familiar non-fading "chrome yellow" colour used on American school buses and by the German postal service, there is the bright red pigment, chrome red (PbCrO₄·Pb(OH)₂), a bright green (Cr₂O₃), a pale green ([CrCl(H₂O)₅]Cl₂), and rich violet ([Cr(H₂O)₆]Cl₃). Trace amounts of chromium also gives rubies and emeralds their characteristic colours.

Below is the relatively rare mineral, crocoite (PbCrO₄), the state mineral of Tasmania.

Chromium is the 24th most abundant element in Earth's crust with an average concentration of 100 ppm. Chromium compounds are found in the environment, due to erosion of chromium-containing rocks and can be distributed by volcanic eruptions. The concentrations range in soil is between 1 and 300 mg/kg, in sea water 5 to 800 µg/litre, and in rivers and lakes 26 µg/litre to 5.2 mg/litre.  Chromium is mined as chromite (FeCr₂O₄) ore.  About two-fifths of the chromite ores and concentrates in the world are produced in South Africa, while Kazakhstan, India, Russia, and Turkey are also substantial producers. Untapped chromite deposits are plentiful, but geographically concentrated in Kazakhstan and southern Africa

In the laboratory Chromic acid is a powerful oxidizing agent and is a useful compound for cleaning laboratory glassware of any trace of organic compounds. It is prepared in situ by dissolving potassium dichromate in concentrated sulfuric acid, which is then used to wash the apparatus. Sodium dichromate is sometimes used because of its higher solubility (50 g/L versus 200 g/L respectively). The use of dichromate cleaning solutions is now phased out due to the high toxicity and environmental concerns. Modern cleaning solutions are highly effective and chromium free. Potassium dichromate is a chemical reagent, used as a titrating agent. It is also used as a mordant (i.e., a fixing agent) for dyes in fabric.

For more information visit:-
http://www.theguardian.com/science/punctuated-equilibrium/2011/aug/12/1?guni=Article:in%20body%20link
http://en.wikipedia.org/wiki/Chromium

Visit our Facebook page!

Besides the articles we post for you here on our blog, why not visit our Facebook page and LIKE our page?

　

http://www.facebook.com/pages/Saint-Helens-United-Kingdom/PR-Labpak-Limited/139326539429818

Hangnails!!

A hangnail or agnail (also known as a stepmother's blessing particularly in the Lancashire region) is a corruption of agnail which literally means painful (anguished) nail.

Hangnails can seem rather insignificant in the grand scheme of health problems but they can become infected and lead to a handful of other issues. Fortunately, there are many ways to avoid hangnail hazards.

Hangnails don't have anything to do with your fingernails. Many people confuse hangnails with ingrown nails, a condition in which the corner of your nail grows into the soft skin of your nail bed.  In fact, hangnails are the dry, sometimes brittle triangular-shaped tags of skin around your fingernails that can tear off.  Because there are many different causes of hangnails, everyone gets them occasionally. But chronic, consistent hangnails can lead to bigger problems.

When the skin around your fingernails tears off, it opens the door to infection, especially when you consider all the bacteria your hands are exposed to every day, not to mention dishwater, cold weather and all the other things that dry out your hands in the first place. Fortunately, there are quick and easy ways to prevent hangnails that range from moisturising often to pampering your hands with cuticle soaks and manicures.

If you just can't beat hangnails, there are also easy ways to treat them. Antibacterial lotions can often do the trick, and in more serious cases, a prescription antibiotic might be in order.

Of course, before you can avoid hangnails, you need to know what causes them.

Hangnails are more common during the cold winter months. During the winter, skin dries out really fast which is one of the main causes of hangnails. Anything that can dry out your skin, such as cold winter weather, harsh chemicals or frequent immersion in water can cause hangnails to develop.

If you are a nail biter it can damage your nail bed, which is the skin underneath the actual fingernail and a weak nail bed can result in more hangnails.

Hangnails that aren't properly cared for can result in an infection called paronychia. There are three types of paronychia infection: bacterial, Candidal -- which is a type of yeast -- and fungal

Now that you know how hangnails happen, you're probably wondering how you can stop them before they start.

• Moisturise your hands and your nail beds.  Moisturising your nail beds helps your nails and your cuticles as well which can have a big impact on your overall nail health
• Stop biting your nails.
• Manicure.
• Wear gloves if you are exposed to harsh chemicals or even just soapy water from washing the dishes.

Working in a laboratory can cause a number of hand problems including latex glove allergies.  Make sure you choose the right gloves for your skin and for the job in hand.  Remember to wash your hands properly and moisturise afterwards.

Remember P&R Labpak offers a range of soaps and moisturisers for laboratories so you don’t need to suffer from hangnails!  The new VWR Safety catalogue is also available covering everything you need relating to personal protection, workplace safety, first aid and housekeeping.  Ask for your copy now!

For more information visit:-

http://en.wikipedia.org/wiki/Hangnail

http://health.howstuffworks.com/skin-care/nail-care/health/hangnails.htm

Filter Papers and Membrane filters.

Laboratory filter paper is a semi-permeable barrier placed perpendicular to a liquid or air flow. It is used to separate fine solids from liquids or air.

Filter paper comes in various porosities and grades depending on the applications it is meant for. The important parameters are wet strength, porosity, particle retention, flow rate, compatibility, efficiency and capacity.

There are two mechanisms of filtration with paper; volume and surface. By volume filtration the particles are caught in the bulk of the filter paper. By surface filtration the particles are caught on the paper surface. Filter paper is mostly used because even a small piece of filter paper will absorb a significant volume of liquid.

The raw materials are different paper pulps. The pulp may be from softwood, hardwood, fibre crops, mineral fibres.

For laboratory use filter papers are made in a variety of ways since specific applications require specific types of papers. The raw materials might be acid washed wooden fibres, carbon or quartz fibres.

In laboratories, filter paper is usually used with a filter funnel, Hirsch, or Buchner funnel.

Ashless filter paper is mainly used for gravimetric methods in quantitative chemical analysis.

 

The link here is useful as it contains a basic guide to choosing the right filter paper grade.


Glass fibre filters are commonly used in laboratories.  The manufacturer Whatman for example offers two types of glass microfiber filters manufactured from 100% borosilicate glass: binder free glass microfiber that is chemically inert and binder glass microfiber.

These depth filters combine fast flow rates with high loading capacity and the retention of very fine particle, extending into the sub-micron range. Glass microfiber filters can be used at temperatures up to 500°C and are ideal for use in applications involving air filtration and for gravimetric analysis of volatile materials where ignition is involved.

 

There are a number of manufacturers and include Whatman, Millipore, Sartorius, Munktell, Pall, Nalgene and more.

 

A Membrane Filter typically traps contaminants larger than the pore size on the addressed surface of the membrane. Contaminants smaller than the rated pore size may pass through the membrane or may be captured within the membrane by other mechanisms. Membrane filters are typically used for critical applications such as sterilising and final filtration.

A useful weblink can be found here.

 

When choosing a membrane filter a number of factors have to be considered, for example:-

• Depth vs Membrane filtration
• Chemical compatability
• Hydrophilic vs Hydrophobic
• Pore size
• Thermal stability

Filtration is a huge area to cover with a short blog article but hopefully the links will prove useful for anyone looking to broaden their knowledge.