Astlett Rubber Inc.


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Rubber Materials
Natural Rubber
Specialty NR Grades
Synthetic Rubber
Carbon Black

Titanium Dioxide

Zinc Oxide

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Suggested Procedures for Natural Rubber Receivers
Astlett Customer Help Sheet

Natural rubber will arrive, after a very long journey, in wooden crates or shrink-wrapped pallets. The net weight in either case will be 1200 KG or 1260 KG, depending on whether 33.33KG bales or 35KG bales are used. Each unit will have 36 bales.

All units will be marked with the NR GRADE, NET and GROSS weights, factory ID, production lot number (referenced in Test Certificates supplied), pallet number in the lot, and country of origin. Also there will be unique shipping marks that distinguish this lot from all others. These marks should be cross-checked with the delivery order that Astlett faxes your company prior to each delivery.

Cold FlowCondition
The rubber units may have had a rough journey in the one-way packing. Any 'rough' units should be recoopered to avoid handling, storage or contamination problems. Shrink wrap units are subject to slumping due to cold flow (see picture at right), especially for Controlled Viscosity grades. Handle With Care.

Simply by cutting windows (4" V shaped cuts) in the polyethylene wrappers in several places between the slats of each crate, a receiver can check for the possibility of any moisture, contamination, infestation, etc. There is no need to destroy the unit.

If moisture is discovered, measures should be taken to promote drying by cutting numerous windows. This lets any trapped moisture escape. If bleach is discovered, more vigourous drying efforts should be undertaken. Typically, removing the crate and outer liner, windowing the affected bales, separating or stripping the bales to expose to air flow, and using a fan or heater to speed drying of the rubber are suggested procedures. The rubber usually returns to its original processed colour. The quality is not affected! See more tips and information on dealing with moisture.

Wooden crates in good condition usually may be stored three high, otherwise two high. Shrink-wrapped units are one high or two high if tiers are staggered. Racks are efficient.

Shelf Life
Natural Rubber has a very long shelf life (at least 50 years). However, the trade considers one year as prime/normal. Some freezing and cross-linking may occur. These are reversible phenomena by heating or premasticating. Read more information on rubber storage and aging.

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