Notes on Filter Paper
Quantitive/Qualative? short answer is if you do not know the difference, use quantitive.
Equivalent Ashless / Specialist #1 etc...
There are many brands and types of filter paper. However for most purposes plain medium speed general paper is the most useful in terms of time/cost effectiveness/results.
Only a small economical range is on offer here, please inquire re; others.
Note: off sized and specialist papers can cost considerably.
Lead acetate strips
Used to detect Hydrogen sulfide (H2S).
Used in microbiology for identification purposes.
For methodology see:
One 5-metre long x 7mm wide roll.
LITMUS NEUTRAL INDICATOR PAPER
100x strips 50mm long x 6mm wide.
MACHEREY NAGEL INDICATOR PAPER
STARCH IODIDE INDICATOR PAPER ROLL
Oxidant absent one colour (white). Oxidant present – 180deg. scale from white to dark navy.
4.8-metre x 6mm reel. Colour chart on each reel.
LASER VIEW KIT
When light is passed along certain materials it is held inside the material and almost zero light is lost through the sides. Materials that do this are called ‘Light Guides’. Very small guides as small as wires are called ‘Opto Cables’ and are used to carry Telephone, TV and Computer communications instead of copper wire.
These shapes have been manufactured from special plastic to show the path of laser light.
NOTE: Although the same size as the lens and prisms used in the Light Box and Optical Sets they are manufactured from a special ‘smoked’ plastic material to show up the laser light beam travelling through them.
This kit comprises: 1x light guide straight bar 250 x 20 x 10mm thick, 1x light guide curved bar 250 x 20 x 10mm thick, 1x rectangular block 75 x 45 x 12mm thick, 1x half round block 75 x 40 x 12mm thick, 1x 45 x 45 x 90 deg prism. 85mm base x 12mm thick, 1x 60 x 60 x 60 deg. prism. 62mm sides x 12mm thick, 1x 30 x 60 x 90 deg. prism. 85mm longest side x 12mm thick, 1x biconvex lens. 60mm long x 12 thick.
COLOUR PLATE SET
For light and optical box demonstrations and experiments.
8x plastic colour plates: 1x each cyan, blue, violet, yellow, magenta, orange, red, and green. Size - 50 x 50mm.
KITS - SOIL / HOW CLEAN IS IT ?
This kit encourages investigation into the nature of soils.
Soils are observed and characterized based on physical examination. The chemical composition is examined and the microbial community studied.
The kit is intended for a demonstration, or small groups, or several repetitions for an individual investigator and will require two 45-minute periods.
KITS - THE SUN'S PATH PLOTTED ON ANY DATE OF THE YEAR
Comprises a wooden desk top model standing 34cm high, beautifully finished and fully operational.
What is the path of the sun where you live on Dec 31 or June 15?
This elegant, easy to use, and hands-on model clearly shows the path of the sun at any latitude during any month of the year.
It also clearly demonstrates any season.
KITS - WATER / HOW CLEAN IS IT?
Water pollution is a major public issue today.
This kit allows students to test local water samples for pH, available phosphate, chloride and lead concentration, oil determination and bacterial contamination.
This kit will support a demonstration, or small groups, or three repetitions for a single investigator and will require two 45-minute class periods, along with three or four days of observation.
LESLIE'S CUBE
Comprises a brass cube, size 130mm, with four different vertical reflecting surfaces. There is access at the top for filling with water. The water is maintained at boiling point with a bunsen burner.
The relative radiant heat output can be compared from each of the different surfaces with the use of infra red sensors. (Cambridge IGSE syllabus item)
LEVER AND FULCRUM APPARATUS
For moments of force experiments. Comprises a one metre ruler fitted with metal knife edge which pivots on a vertical support which is attached to a solid base.
Supplied with two 50g slotted mass hangers, both with 4x 50g slotted masses.
LEYDEN JAR
Shows clearly that the electric charge resides in the dieletric. Has a polyethylene unbreakable dielectric which is almost unaffected by humidity. As a consequence it efficiently retains it’s electrostatic charge.
The spun aluminium internal and external cups are removable leaving the dielectric which holds the electric charge. The inner coating carries a rod and sphere for charging.
The dielectric is unbreakable and has a volume of approximately one third of a litre. Stands 210mm high.
LIGHT BEAM – SOUND TRANSMISSION ALONG
Modern telecommunications involves the transmission of voice messages along a beam of light. This kit allows students to explore the major components of this important technology. It also demonstrates energy conversion among several forms including electromagnetic, electrical, optical and audible sound. Kit comprises one LED source module (spectrometer light source), one light detector module, one AM/FM radio, one amplifier/speaker unit, two interconnection cables and one piece of optical fibre cable with fittings. Instructions included.
Uses for filter paper include:
* Simple Chromatography
* Making test strips
* Antiseptic discs
* Transfer powders
Please remember single prices are higher then multi purchases or package deals
pH test booklets
Ten books in plastic holder. Each book contains 20 strips 10mm x 65mm (total 200 strips). Colour chart in each holder.
From wide to narrow very specific ranges.
Bromocresal Indicator strips
Each pack holds five books of 20 strips 10mm x 65mm – total 100 strips per pack.
LENZ'S LAW DEMONSTRATOR
A dramatic demonstration of Lenz’s Law.
A changing magnetic field induces an electric field – Faradays Law of Induction. A circulating current induces an electric field – Ampere’s Law. If a magnetic field changes within a conductor a current is produced which produces a secondary magnetic field.
Lenz’s Law states that this secondary magnetic field always opposes the change in the original field. Two seemingly similar masses are dropped down a 1.5metre thick walled aluminium tube. One takes approx. 1/2 second to fall; the other 8 to 10 times longer. Little do your students realise that one has a powerful neodymium magnet enclosed and you, being the cunning sort, have not told them. Students will be fascinated and puzzled by this excellent introduction to the voltages, currents and opposing fields induced by a changing the magnetic field.
The phenomena can be explored further by weighing the aluminium tube when the magnet is falling. To facilitate this the aluminium tube has a mounting arm fitted with a velcro attachment pad with a hole for attaching a spring balance (not supplied)
LIGHT BOX AND OPTICAL SET - COLOUR FILTERS SET
COLOUR FILTERS FOR LIGHT BOX AND OPTICAL SET:
8 x colour filters: 1 x each cyan, blue, violet, yellow, magenta, orange, primary red, and primary green.
Replaces filters mounted in 35mm cardboard slide mounts.
LOOP-THE-LOOP APPARATUS
To demonstrate the circular motion of an object in a vertical plane.
Comprises a low friction track, 3cm wide, for a steel ball to roll down. It then rotates in a vertically mounted 14cm diameter loop and completes it’s journey by stopping in a cradle at the other end of the track.
Height of start of track is 31.5cm and height at end 17.5cm.
Price and availability dependent
Filter Paper:
Only a small common range is listed here. Just inquire for differant sizes and types.
It is recommended to use medium speed, medium retention as the best compromise for speed and filtration of most amateur substances.
pH 1 to 14 (14x colour changes)
pH 1 to 4 (4x colour changes)
pH 12 to 14 (5x colour changes)
pH 3.8 to 5.4 (8x colour changes)
pH 6.4 to 8 (8x colour changes)
pH 8.2 to 10 (8x colour changes).
Most other brands supply only 100 strips, there are 200 in these books. The hard case is a added bonus and the great range with clear colors rounds it all out.
Indicator papers are used to determine the pH of a substance. Unlike Litmus paper which indicates if the substance is an acid or Base, pH paper quantifies how strong the acid or Base is. e.g. Coca a cola is an acid so is Hydrochloric acid, a pH indicator strip gives a visual color change (that relates to a formula) allowing the difference in strength to be measured.
Cobalt Chloride Indicaor strips.
Used to detect the presence of water.
These can be heated to be reused a few times.
Packet of 5 booklets. 100 strips.
As a pH test strip measures pH ~8.2 and 10
pH 0.5 to 5.5 (pH gradation 0.5)
pH 1 to 14 (pH gradation 1.0 / 2.0)
pH 12 to 14 (pH gradation 0.5)
pH 3.8 to 5.8 (pH gradation 0.2 / 0.3)
pH 4 to 7 (pH gradation 0.3)
pH 6.4 to 8 (pH gradation 0.2)
pH 8 to 10 (pH gradation 0.2/0.3)
pH 9 to 13 (pH gradation 0.5)
INDICATOR PAPER
Non bleeding strips One hundred non bleeding strips each 85 x 6mm.
pH 0 to 6 (18x colour changes)
pH 1 to 14 (28x colour changes)
pH 4.5 to 10 (21x colour changes)
pH 7.5 to 14 (24x colour changes)
Bi-ConCave Lens
Optical experiments and demonstrations.
Bi-Convex Lens
Optical experiments and demonstrations.
100cm focal length, glass
100cm focal length, glass
7.5cm focal length, biconvex, size: 57mm x 14mm
3.75cm focal length, biconcave, size: 63mm x 14mm
7.5cm focal length, biconcave, size: 57mm x 14mm
Acrylic shaped Lenses for optical studies.
7.5cm focal length, biconcave, glass, size: 50mm x 45mm
Keck or Joint Clips.
Used to secure ground glass joints. Colour coded for ease of use.
JACK – LABORATORY
A strong and stable all metal 200mm x 200mm platform that can be precisely raised and lowered between 70mm to 340mm above bench height by turning a hand wheel.
Capacity: Max static load 30 kg
Size: 100 x 100mm
Height: 140 mm max
Capacity: Max static load 60kg
Size: 150 x 150 mm
Height: 280 max
Capacity: Max static load - 60 kg
Size: 100x100mm
Height: 290mm Max
A quick reminder
These are SINGLE prices.
The more you buy of the same or as a mixture of items, the cheaper your purchase gets!
15cm focal length, biconcave, glass, size: 45mm x 40mm
Container – Polystyrene (clear)
• Cap – Polyethylene
• Available in 25ml and 60ml
• Screw cap
• Labelled and unlabelled
• Also available with white container and brown cap colour options
CARBOXY METHYL CELLULOSE 250
For increasing viscosity of a solution
FERROFLUID (60ml)
Demonstrate magnetic fields in an awesome way! Ferrofluids are composed of nanoscale particles (< 10 nanometers) of magnetite, hematite or other compounds containing iron in a carrier fluid.
It becomes strongly polarised in the presence of a magnetic field and produce some peculiar and incredible liquid formations. Included: 60 ml ferrofluid in bottle & instructions
Age: Can be very messy so better for middle school and older as a hands-on or as a teacher demonstration.
ROSIN POWDER (SINGING ROD SET)
A bag of violin rosin powder for the singing rods demonstration. Apply the rosin to your thumb, forefinger and the rod. You do not need much, so this bag should last forever . . .
LAUNDRY BAG SLIME 1 - 4
PVA laundry bags are used in hospitals to minimise the risk of linen cross-infection to staff. Now you can use these water soluble bags to prepare PVA solutions for Slime.
One bag makes 1 liter of PVA solution (or 1 liter of slime) and all you need to supply is a saturated Borax solution (from the supermarket). Easily coloured with food dyes.
One pack consists of 5 bags plus instructions.
THERMOPLASTIC POLYMER
Plastics that can be heated and reformed over and over are known as thermoplastics. Polycaprolactone is a great thermoplastic.
It melts at 58 to 60 °C so it can conveniently be melted in hot water. Can be moulded, cut and extruded. Safe & Biodegradable.
POLY/OX
This self-siphoning gel is also known as ‘anti-gravity’ liquid as it seems to defy gravity. Simply dissolve 3 g of the powder in iso-propyl alcohol and water to form an extremely viscous, non-Newtonian fluid.
This fluid has amazing properties! It will flow uphill and the entire glob will siphon itself into a lower beaker. You may dye it with our photo luminescent pigment to use with a UV source in the dark. Very spectacular.
