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Prysmian JEM Resin | Cable Jointing Resins LV MV HV

Published 06 Feb 2019

Cable Jointing Resins

Cable Jointing Resins

  • uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager

Prysmian JEM Resin

LV MV HV Cable Jointing Resins

Prysmian JEM Resin was developed to meet the growing concerns regarding Jointer exposure to isocyanates in the workplace, especially when using cable joints for jointing utility cables in confined spaces and cable trenches with inadequate ventilation.

JEM Resin developed by Prysmian is a non-isocyanate cable jointing resin with all the technical performance characteristics of conventional jointing resins but with additional features and benefits for the encapsulation of LV, MV or HV joints typically operating at 600V/1000V, 11kV and 33kV.

Changing Legislation For Cable Joint Resins

From December 1st 2010 cable jointing resins containing MDI (Methylene diphenyl diisocyanate) are re-classified as Carcinogen Category 3, suspected of causing cancer and will carry new labelling to this effect.

Subsequently, Prysmian is advising utilities, cable jointing contractors and specifiers to adopt a “Substitute it Now (SIN)” philosophy when it comes to choosing which resin products to use for jointing cables.

This applies to the vast majority of cable jointing resins on the market, except for Prysmian’s JEM resin cable jointing solutions which are 100% MDI free and present none of the health and safety risks associated with other jointing resins containing hazardous chemicals. From December 1st all Prysmian resin cable joint kits will be JEM resin only.

JEM Resin Pack Quantities & Order Codes

Contact Thorne & Derrick Sales for stock availability and current pricing for JEM: 

Prysmian Resin Order Code Description Colour 
JEM400 Prysmian Cold Pour Resin Compound 4 Litre (8 x 0.5 Litres Green
JEM600 9X Prysmian Cold Pour Resin Compound 6 Litre (3 x 2 Litres) Green
JEM200P Prysmian Cold Pour Resin Compound 6 Litre (3 x 2 Litres) Green

 

Cable Jointing Resins

Cable Jointing Resins. Joint Encapsulating Material (JEM).


Prysmian JEM Resin Cold Pour Compound Features & Benefits

  • Low viscosity resin (very searching, no voids, easier mixing by the Jointer)
  • Easy mixing by the Jointer at low ambient temperatures (e.g. -15°C)
  • Curing reaction not sensitive to moisture (will cure underwater and in wet cable trenches or joint holes)
  • Filled cable joints with Prysmian JEM resin may be energised immediately if undisturbed
  • JEM resin supplied in clear pouches which allows mixing to be observed in process
  • Excellent adhesion to XLPE, PVC, Lead type cables
  • Type approved in LV cable joints (ENA TS C81/3 and BS EN 50393)
  • Cable jointing resin is tested in accordance with HD631.1
  • Re-enterable cable jointing compound resin version available

➡ Watch & Learn from this video by Prysmian Group on how to Mix, Pour & Deliver the JEM range of cable jointing resins:

Prymsian JEM Resin

Prymsian JEM Resin

Prysmian JEM Resin

Performance Data

Properties Of JEM Resin
Type Low hazard, isocyanate free
Appearance / Colour Grey / brown fluid when mixed
Viscosity Of Mixture @ 5°C 3700 mPa.s
Relative Density 2g/cm³ @ 25°C
Flash Point >110°C
Non-volatile Content 85%
Storage Conditions Away from direct sunlight <50°C
JEM Resin Application Properties
Mixing Ratio – by weight 5.6 powder: 1 liquid
Flash Point >110°C
Pot Life 16mins @ 5°C
5mins @ 40°C
Gel Time 15mins (0.5 litre @ 25°C)
Peak Exothermic Temperature 0.5litres 35°C @ 5°C
70°C @ 40°C
Complete Cure Time 24 hours @ 25°C
JEM Resin Performance Properties
Colour Of Mixture Grey / Brown
Class Of Resin Methacrylate
Water Absorption Rate 0.011% @ 24hrs, 25°C
0.8% @ 42days, 50°C
Hardness 74 Shore A
Volume Shrinkage After Curing <1.0%
Tensile Strength 2.5 N/mm²
Ultimate Elongation 50%
Impact Strength No break
Volume Resistivity 5 x 10¹³ Ohm.cm @ 20°C
7.4 x 10¹¹ Ohm.cm @ 90°C
Surface Resistivity 1 x 10¹³ Ohms
Dielectric Strength 9.3 KV/mm
Thermal Conductivity 1.31 W/m.K
Maximum Continuous Operating Temperature 95°C
Time To Energise LV Joints (Undisturbed) Immediately
Time To Energise LV Joints (Backfilled Or Moved) 2hrs

 

Prysmian JEM Resin

Cold Pour Compound Mixing Instructions

The Jointer must take care when mixing the JEM Resin prior to pouring into the cable joint shell or mould.

Open Container and remove JEM kit Aerate the powder by gripping the pouch at each end
Step 1:  Open container and remove JEM Resin Kit. The Jointer should check the resin bag for any signs of damage before proceeding Step 2: Aerate the powder by gripping the pouch at each end and tumbling the powder for up to thirty seconds,
this will facilitate mixing of the JEM Resin
To start the mixing process hold the bag as shown Squeeze the liquid through the membrane seal and onto the powder
Step 3: To start the mixing process, hold the JEM Resin bag as shown above, so that the liquid is forced onto the powder Step 4: Squeeze the liquid through the membrane seal and onto the powder
Make sure that the membrane seal is completely open before mixing the powder and liquid together Before mixing rotate and shake at the corners to free the powder
Step 5: Make sure that the membrane seal is completely open before mixing the powder and liquid together Step 6: Before mixing the Jointer should rotate and shake at the corners to free the powder
Tumble mix and knead the bag for up to two minutes Finally cut one corner and pour the contents into the joint shell
Step 7: Tumble mix and knead the JEM Resin bag for up to two minutes, to ensure that there are no lumps in the bag Step 8: Finally cut one corner and pour the contents into the cable joint shell

Customer Question…

“I’m supervising electrical connections on Scottish Power’s LV network – service joints of varying types. We have a cable jointer query regarding curing time of the Prysmian JEM resin you supply which I need to get completely right. Many cable jointers say leave the joint for 24 hours to cure, some say 2 hours. What is your standard curing time for service joints? Let’s assume it’s a single phase service off a 300sqmm PILC cable. Please bear in mind that we want to backfill and compact the joint bay in order to reinstate the joint bay, so assume we’re using a rammer. Obviously we will not backfill/reinstate if it compromises the cable joint’s integrity, however, we do have pressures to reinstate said joint bays as soon as possible.

Prysmian Answer…

“Full cure is not achieved for 24 hours but Prysmian JEM resin joints can be energised immediately provided they are not being moved.”

Cable Jointing Resins

3M Electrical

3M Scotchcast resin insulated cable joint kits are designed for indoor, outdoor (weather exposed), direct buried or submersed applications.

3M brand Scotchcast Resins are 100% solids, electrical grade, hydrolytically stable insulating resins. The unique electrical and physical properties of 3M Resins make them ideal for insulating and protecting electrical/ electronic parts and assemblies. Their physical features also make them suitable for non-electrical, general use applications, for example as adhesives or sealants.

A Safe, Clean, Simple & Reliable Joint Solution

• High quality range of cable jointing resins for low and medium voltages
• Unique Patented Close Mixing and Pouring (CMP) system from 3M Electrical
• Transparent Mould for better control of the job by the Jointer
• Resin packed in transparent 2-chamber mixing bags for delivery into the cable joints
• Cable jointing resins with approvals according to VDE 0291 part 2

♦ G38A Compund | Prysmian BICC Cable Joint, Termination & Cable Box Filling Compounds

Further Reading