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Flexible Mould Making Materials

FLEXIL - S RTV 25C + 5% CATALYST 5
Flexil-S RTV 25C + 5% Catalyst S is a two part sili-cone elastomer which cures at room temperature. It is used to make conventional cast moulds or with the addition of 1 or 2% Tixo additive can be used to make "skin" moulds for highly detailed resin castings.

ADVANTAGES
  High elongation
  Good tear strength
  Precise reproduction
  Low shrinkage

APPLICATIONS
Suitable for the reproduction of models for scenery, restoration, fibrous plasterwork, palaeontology etc. Useable with thixotropic agents Additive for application by stiff brush or knife.

CHARACTERISTICS
(a)

 

RTV 25C

Catalyst S

Appearance

Viscous fluid

Fluid

Colour

Beige/White

Green

Specific Gravity gcm- at 20C

1.27

1.00

Viscosity/cps

24,000

55

MIXING
(b)

RTV +5% Catalyst S Green

Pot life / Mins

Demould/Hours

 

75

16-24

AFTER CROSSLINKING
(c)

Shore Hardness/A [ASTM D2 240 2mm film]

25

Tensile Strength / Mpa [DIN 535041]

4.1

Elongation at break/% [DIN 53504]

450

Tear Strength KN/m [ASTMAS D624 Notched Die B]

20

Linear Shrinkage

<0.5

ADDITIVES
(d)
Thixotropic Additives when added at 1-5% to the catalysed mix will make the mixture applicable by a stiff brush or pallet knife.

PACKING
Available in 21kg, 5kg and 1kg kits
HEALTH & SAFETY
(Refer to Health Safety Data Sheet)
Handling and mixing of Flexil-S RTV 25C & Cat S require the following precautions:
 

i)   Wear gloves & goggles
ii)   Do not eat, drink or smoke
iii) Avoid swallowing, skin or eye contact
iv) If contact does occur, wash with clean water
      immediately & in case of eye contact, consult a doctor

SHELF LIFE
Flexil-S RTV 25C & Cat S have a minimum shelf life of six months when stored in the original containers at temperature between 18 and 25C. Note:
If allowed to freeze the RTV will be spoilt. If allowed to heat to excessive temperatures, gel times will be substantially shortened.
The cured mould can be used 24 hours after pouring but if the best long-term properties are required it should not be used for 5-7 days after manufacture.

TIXO T1A ADDITIVE
Order ref.
AAO 17857 50grm
AAO 17858 500g

LATEX RUBBER
Latex Rubber is a liquid prevulcanised natural rubber for flexible mould manufacture. Latex Rubber moulds are widely used for applications such as cast resin chessmen and concrete garden ornaments. The moulds are ideally made by the dipping process (see page 81) but can also be made by brushing and air-drying layers to achieve the appropriate thickness.

Typical Properties:

1. Liquid Latex

Total Solids Content

ca 61.0%

Ammonia Content

ca 0.6%

PH

ca 10.5

Viscosity @ 30C (Ford cup no. 3)

ca 35 secs.

2. Latex Mould

Modulus 700% elongation

8.0 Mpa

Tensile Strength

22.0 Mpa

Elongation at break

900%

Order Ref: AAO 16610 4kg      ABO 16610 20kg

Melting Pots Type DPS

63a

The DPS range of standard melting pots have been designed for industrial and hobbyist melting of vinyl compounds, waxes, glues and plastics etc. for coating, casting, protecting etc.
Pots are electrically heated and thermostat temperature controlled from 50C to 200C. Constructed from anodised aluminium with ceramic fibre insulation. 220/240 volt standard, 110V etc. available.
Pots supplied with 2m cable and fused plug, lifting handle, double wall heat conserving lid, on/off switch, safety thermal cut-out and available with pouring spout. Alternative thermostats with ranges of 30 to 90C, 30 to 120C and 50 to 300C are available.

Type

CAPACITY

INTERNAL DIMENSIONS diameter x depth

WATTAGE NOMINAL

WEIGHT

litres

pints

mm

inch

vinyl

max

Kg

DPS 2.5

2.5

4.4

150 x 140

6 x 5.5

275

600

4

DPS 6

6

10.5

200 x 190

8 x 7.5

600

1125

6

DPS 12

12

21

250 x 240

10 x 9.5

1050

1650

8

DPS 20

20

35

300 x 290

12 x 11.5

1975

1975

10

Also available in sizes from 40 litres to 250 litres.

Order ref.
AOO 16335 2-5ltr
AAO 16336 6ltr
AOO 16337 12ltr
AOO 16338 40ltr
AOO 16345 100ltr
AOO 16346 200ltr

Flexil PVC Hot Melt Compound

A flexible vinyl compound which is melted by heating. The pattern used must be made of a material which is not affected by heat. Old moulds may be melted for re-use.
Flexil is supplied in two grades as follows:
Hard grade HG Blue.
Soft grade SG Natural.
No release agent required.
Both have a melt temperature of 150 - 165C and
pouring temperature of 140 - 150C.
Both grades can be mixed to give the
hardness required.
Unit volume 800 ml (49 cu. ins.) per kilo.


Instructions for use ca be found on our Information Pages.

Order ref.
AOO 16355 Soft Natural
AOO 16356 Hard Blue

Vaccum Degassing Unit

63b

An essential piece of equipment for removing entrapped air in mould making and casting materials.
Mould making compounds such as silicone rubbers, and epoxy resins all contain entrapped air due to mixing in the hardener or catalyst and it is essential that this is removed before pouring, to ensure a perfect blemish-free mould.
Casting materials such as polyester resin, epoxy resin, etc., should also be degassed after the catalyst is added to produce good mouldings free from porosity.
The unit comprises a vacuum pump driven by a 1 hp electric motor, a cylindrical vacuum tank 12" high x 12" (304mm x 304mm) diameter with a clear perspex lid, and vacuum gauge and controls.


Order ref. AAO 17901