Black Jack Bitumen Trowel Mastic 903

  • Fast drying.
  • Suitable for use with all bituminous coatings.
  • Remains flexible for long periods after application.
  • Comes ready for use.
  • Coverage: 2 litres per m² (giving 2mm wet thickness).
View full product details
In Stock
As low as £19.50 Inc. VAT

In Stock

Free Delivery for orders over £50 

View delivery information
+ -

Product Details

Everbuild Black Jack Bitumen Trowel Mastic 903

Trowel Mastic is a trowel applied black heavily filled bituminous compound with added fibres for reinforcement.

Used mainly for waterproofing, stopping, bedding, bonding, and sealing, and can adhere to a number of different substrates including mastic asphalt, roofing felt, corrugated and cast iron, fibre cement, and slates, timber, concrete, and metals such as copper, zinc, and lead.

The product forms a surface skin, but the mass below remains soft to allow for moderate movement. It is easily applied using a trowel or putty knife. For application details on different substrates please refer to the datasheet.

Everbuild Trowel Mastic 903 Icons

Product Specification and Technical Information: 

Product Information  
Chemical Base Bitumen in white spirit, gas oil
Colour Black
Shelf Life 24 months from Manufacture in tightly sealed undamaged tins
Storage Details Store in original container in cool dry conditions (5°c - 25°c) and away from sources of ignition
Density ca. 1.45 g/cm³
Chemical Resistance

Resistant to most salt solutions, dilute acids/alkalis, water, and alcohol

Not resistant to oils, solvents, and some detergent solution.

Service Temperature -20°c - +50°c
Thermal Resistance

Will not flow or sag within service temperature limits

Ambient Air Temperature 5°c - 40°c. Surfaces must be free from ice and water
Drying Time 24 hours to develop a surface skin. The mass below remains plastic for many months after
Coverage 2 Litres per m² (giving 2mm wet thickness)

Data Sheets:

Black Jack 903 Material Safety Data Sheet

Black Jack 903 Technical Data Sheet

Product Delivery

Ashbrook Roofing offers free delivery for orders over £50 to United Kingdom postcodes excluding the Highlands, Islands and Ireland.

Delivery expectation for orders placed before 2.00pm (Mon - Fri) are:

You pay: £4.95
Delivery: 2-3 working days
For orders placed before 2.00pm (Mon - Fri)

FREE Delivery   
On all orders over £50
Delivery: 2-3 working days
For orders placed before 2.00pm (Mon - Fri)

We are here to help you
Prior to shipment, we’ll let you know of our estimated date of delivery. Don’t worry if you have made other plans or find this inconvenient.

If you can let us know a day in advance we’ll work with you to find a better alternative.

And remember, if you need help, have any concerns, or require a more timely delivery of your product(s), then simply give our customer services team a call on 01629 828500.

Or alternatively email us at and we'll do our very best to help

Read More

Other options customers have chosen
Copyright 2021 Ashbrook Roofing and Supplies Ltd. (Harrison Way, Matlock, Derbyshire, DE4 2LF) Company Registration Number: 4549398 | VAT Number: 419721937 | Telephone: 01629 828 500 | Email: